NLE Neurosensory Nursing — Cerebrovascular Disorders and Increased Intracranial PressureStudy Notes

A stroke is defined as a sudden loss of brain function resulting from disrupted cerebral blood flow, leading to rapid neuronal death within minutes. Strokes are broadly classified into two major categories: ischemic (80–85% of all strokes) and hemorrhagic (15–20% of all strokes). This distinction is clinically critical because treatment approaches are opposite—thrombolytic (clot-busting) drugs help ischemic stroke but are contraindicated and potentially catastrophic in hemorrhagic stroke. Therefore, an emergent non-contrast CT scan of the head is always the first diagnostic step to definitively rule out intracranial bleeding before administering any thrombolytic therapy. Modifiable risk factors that nurses should assess and help patients control include uncontrolled hypertension (the single most important modifiable risk factor), atrial fibrillation, diabetes mellitus, dyslipidemia, tobacco smoking, obesity, excessive alcohol use, physical inactivity, and significant carotid artery stenosis. Non-modifiable risk factors include advancing age (risk increases significantly after age 55), male gender, race/ethnicity, and family history of stroke. In the Philippine healthcare context, hypertension remains underdiagnosed and poorly controlled in many communities, making nursing education and secondary prevention crucial roles for nurses in primary health centers (RHUs) and barangay health stations. Understanding stroke pathophysiology is essential: when a cerebral artery is occluded, the affected brain tissue develops an area of immediate cell death (the infarct core), surrounded by a region of at-risk but potentially salvageable tissue called the penumbra. The penumbra remains viable for a limited time window (typically 3–4.5 hours), and this is the therapeutic target for urgent reperfusion therapy. Every minute of ischemia, approximately 1.9 million neurons die, making the phrase 'time is brain' a fundamental principle in acute stroke care.

Ischemic stroke results from blockage of a cerebral artery, most commonly caused by either a thrombus (a blood clot forming in situ on atherosclerotic plaque within a cerebral artery, termed thrombotic stroke) or an embolus (a clot or debris traveling from a remote source and lodging in a cerebral vessel, termed embolic stroke). Embolic strokes, often arising from the left atrium in atrial fibrillation, sometimes from a cardiac thrombus post-myocardial infarction, or from arterial atherosclerotic plaques, carry a higher risk of recurrence and are the indication for long-term anticoagulation therapy. The territory affected depends on which artery is occluded. For example, occlusion of the middle cerebral artery (MCA)—the most commonly affected vessel—causes contralateral (opposite-side) hemiparesis, sensory loss, and, if the dominant hemisphere is affected, expressive aphasia; if the right hemisphere (non-dominant in most people) is affected, spatial-perceptual deficits and unilateral neglect. Anterior cerebral artery (ACA) occlusion causes contralateral weakness, particularly of the lower extremity. Posterior cerebral artery (PCA) occlusion causes hemianopia (loss of vision in half the visual field), often with memory and language deficits if the dominant hemisphere is involved. Diagnostic confirmation includes non-contrast CT (to rule out hemorrhage), followed by CT angiography or MR angiography to identify the arterial occlusion, diffusion-weighted MRI (which detects early ischemic changes not visible on CT within the first few hours), and ECG plus echocardiography to identify potential cardiac sources (especially important in embolic stroke). Blood glucose must be measured because both hypoglycemia and severe hyperglycemia can mimic or worsen stroke symptoms. In the Philippine healthcare setting, where access to advanced imaging may be limited in peripheral areas, nurses play a vital role in rapid assessment and transport of suspected stroke patients to tertiary centers with thrombolytic and thrombectomy capabilities.

Hemorrhagic stroke results from rupture of a cerebral blood vessel, with bleeding either into the brain tissue itself (intracerebral hemorrhage) or into the subarachnoid space (subarachnoid hemorrhage). The two most common causes are uncontrolled hypertension (chronic high blood pressure weakens small vessel walls) and rupture of a cerebral aneurysm. Hemorrhagic strokes carry higher mortality and greater morbidity than ischemic strokes because bleeding not only destroys tissue directly but also raises intracranial pressure by displacing brain tissue and triggering cerebral edema. A ruptured cerebral aneurysm, classically located in the Circle of Willis (particularly at the junction of the anterior communicating artery and anterior cerebral artery, or at the posterior communicating artery-internal carotid artery junction), causes a subarachnoid hemorrhage. The classic presentation is sudden onset of the **'worst headache of my life,'** often described as 'like a thunderclap' or 'like being struck on the head,' accompanied by neck stiffness (from meningeal irritation from blood in the subarachnoid space), photophobia, and rapid neurologic deterioration. Rebleeding can occur, especially in the first 24 hours, making immediate medical and surgical intervention critical. Intracerebral hemorrhage from hypertension typically occurs in specific locations: the basal ganglia (putaminal hemorrhage), thalamus, pons, or cerebellum—areas supplied by small penetrating arteries damaged by chronic hypertension. The clinical presentation depends on the location and size of the hematoma; a large cerebellar hemorrhage can cause hydrocephalus and brainstem compression, requiring urgent surgical decompression. Arteriovenous malformations (abnormal tangles of vessels with direct arteriovenous shunting) can also rupture and cause hemorrhagic stroke, particularly in younger patients. Nursing management of hemorrhagic stroke differs fundamentally from ischemic stroke: **thrombolytic and anticoagulation therapy is absolutely contraindicated**, as these will worsen bleeding. Instead, management focuses on hemostasis, blood pressure control (though target BP is controversial and should follow local protocols), reversal of anticoagulation if present, prevention of rebleeding and increased ICP, and preparation for possible surgical intervention (aneurysm clipping or coil embolization, hematoma evacuation). Nimodipine, a calcium channel blocker, is used to prevent vasospasm (a dangerous complication that develops days after aneurysm rupture). In the Philippine context, many hemorrhagic stroke patients present late with large hematomas, making early recognition and rapid transport to neurosurgical facilities crucial. Nurses must educate patients and communities about strict blood pressure control as a primary prevention measure.

A transient ischemic attack (TIA) is a brief episode of transient neurologic dysfunction caused by temporary ischemia of a brain region, with complete resolution of symptoms. By definition, TIA symptoms **resolve completely within 24 hours, typically much sooner (often within 15–60 minutes), and without permanent infarction on imaging.** The distinction from a completed stroke is important: TIA leaves no permanent brain tissue damage, whereas stroke does. However, TIA is a major warning sign—it indicates significant cerebrovascular disease and carries substantial risk of future stroke: approximately 10–15% of TIA patients will have a stroke within 3 months if untreated, with the highest risk in the first 48 hours after the TIA. The clinical presentation of TIA is identical to acute stroke—sudden weakness, numbness, aphasia, vision loss, or ataxia—because the same vascular territory is temporarily ischemic. The key difference is that these symptoms resolve spontaneously (often while the patient is being transported or evaluated), which can lead to dangerous underestimation of the event's significance. Patients may minimize TIA symptoms ('it went away, so it was nothing') or healthcare providers in non-specialized settings may discharge them without urgent workup. This is a critical error: every TIA warrants urgent investigation and aggressive secondary prevention. Workup for TIA includes brain imaging (MRI with diffusion-weighted imaging is more sensitive than CT for detecting small infarcts; approximately 15–20% of TIAs actually have evidence of acute infarction on DWI), carotid artery imaging (ultrasound Doppler, CT angiography, or MR angiography to detect significant stenosis), ECG and possibly echocardiography (to identify atrial fibrillation or cardiac emboli sources), and risk stratification (using tools like ABCD2 score: Age, Blood pressure, Clinical features, Duration of symptoms, Diabetes—higher scores correlate with higher stroke risk within days). Secondary prevention after TIA includes antiplatelet therapy (aspirin, clopidogrel, or combination therapy like aspirin-extended-release dipyridamole, depending on the cause and local guidelines), aggressive management of modifiable risk factors (blood pressure target <140/90 mmHg or per guidelines, diabetes management, lipid lowering), lifestyle modification (smoking cessation, dietary changes, physical activity), and evaluation and treatment of significant carotid stenosis (endarterectomy or stent placement in selected cases). In the Philippine healthcare system, many TIA patients are seen in primary health centers without rapid access to imaging and neurology specialists; nurses must educate patients and families about the urgency of seeking evaluation, ensure referral to appropriate tertiary centers, and emphasize the critical importance of medication adherence for secondary prevention.

For eligible patients with acute ischemic stroke, intravenous thrombolytic therapy with alteplase (also known as tissue plasminogen activator or tPA) is a life-saving intervention that dissolves the occluding thrombus and restores cerebral blood flow to the penumbra, potentially salvaging brain tissue and minimizing disability. Alteplase is a recombinant version of the naturally occurring fibrinolytic enzyme and works by converting plasminogen to plasmin, which degrades fibrin in the thrombus. The treatment window for IV tPA is approximately 3 hours from symptom onset, extended to 4.5 hours in selected patients with favorable prognostic indicators. This narrow window is why emergency response, rapid CT scanning, and physician notification must occur simultaneously—every minute counts. The concept of 'last known well' is absolutely critical: this is the time when the patient was definitely known to be without neurologic deficits. For patients who awaken with symptoms or whose exact symptom onset is unknown, standard IV tPA is not administered (though imaging-guided protocols at specialized centers may allow selection of suitable candidates based on imaging appearance of the brain). Establishing the exact time is a nursing responsibility—asking the patient, family members, or witnesses 'When did you last see the patient completely normal?' or 'When was the last contact when they seemed fine?' Absolute contraindications to IV tPA include any evidence of hemorrhage on CT imaging, active internal bleeding, recent (within 3 months) intracranial surgery or head trauma, history of previous intracranial hemorrhage, and uncontrolled severe hypertension (systolic >185 mmHg or diastolic >110 mmHg at the time of tPA administration—these patients must have blood pressure lowered first). Relative contraindications include recent major surgery, recent trauma, severe thrombocytopenia, and therapeutic anticoagulation with INR >1.7. Nursing management of the tPA-treated patient is highly specialized and requires continuous vigilance: The nurse must accurately dose alteplase (0.9 mg/kg, maximum 90 mg), with 10% of the dose given as an intravenous bolus over 1 minute, followed by the remaining 90% infused over 60 minutes, using a controlled infusion pump. During and after tPA infusion, the nurse must avoid any invasive procedures—no arterial punctures for blood gas sampling, no intramuscular injections, no urinary catheterization (or if absolutely necessary, use aseptic non-touch technique and avoid traumatic insertion), no nasogastric tube insertion, no central line placement. These measures prevent iatrogenic bleeding. The most important monitoring parameter is neurologic status: assess consciousness, pupils, motor and sensory function, speech, and vision every 15 minutes during infusion and every 30 minutes for the first 24 hours. Watch for signs of intracranial hemorrhage—the most serious complication—including sudden severe headache (worst of life), vomiting, acute neurologic deterioration, hypertension, bradycardia, and pupillary changes. If hemorrhage is suspected, **immediately stop the tPA infusion, notify the provider, and repeat CT without delay.** Bleeding complications may also manifest as oozing from puncture sites, hematuria, or hematemesis. Maintain vital signs monitoring, keep the patient NPO until swallowing assessment is completed (many stroke patients have dysphagia), and manage fever aggressively (each degree Celsius elevation increases metabolic demand and worsens neurologic outcome). Endovascular mechanical thrombectomy—using a catheter-based device to physically remove the clot—is an emerging therapy that extends the effective treatment window for large-vessel occlusions (typically MCA, basilar artery) in selected patient populations to 6–24 hours, depending on imaging criteria. This intervention is available only in specialized stroke centers in major Philippine cities; nurses in secondary and tertiary hospitals must be aware of thrombectomy availability and facilitate rapid transfer when indicated. In the Philippine healthcare context, most rural and secondary hospitals cannot administer IV tPA or perform mechanical thrombectomy. Nurses must recognize this and rapidly transfer eligible acute ischemic stroke patients to designated stroke centers. The concept of primary stroke centers (centers with CT, thrombolytic capability, and stroke team) and comprehensive stroke centers (with thrombectomy capability) is increasingly emphasized in Philippine healthcare planning.

The skull is a rigid, non-distensible compartment containing three primary components: brain tissue (~80%), cerebrospinal fluid (~10%), and blood (~10%). The Monro-Kellie doctrine states that the total volume within the skull is fixed; if the volume of any one component increases, the others must decrease or intracranial pressure (ICP) will rise. Normal ICP is 5–15 mmHg; sustained ICP above 20 mmHg requires intervention, and pressures above 40 mmHg are associated with poor outcomes. When ICP rises uncontrollably, it compresses brain tissue, distorts normal anatomy, and can cause herniation—the displacement of brain tissue through natural openings (transtentorial herniation, tonsillar herniation), which is frequently fatal. Causes of increased ICP include cerebral edema (the most common cause, either vasogenic edema from breakdown of the blood-brain barrier in trauma, tumor, infection, or ischemic stroke; or cytotoxic edema from intracellular fluid accumulation in hypoxia, ischemia, or traumatic injury), hemorrhage (epidural, subdural, or subarachnoid), space-occupying lesions (brain tumors, abscesses), hydrocephalus (impaired CSF flow or absorption), and obstruction to venous outflow (venous thrombosis, pressure from a mass). Clinical manifestations of increased ICP develop in a predictable sequence based on the Cushing's triad concept, though it is crucial to understand that **the earliest and most sensitive sign of increased ICP is a decreasing level of consciousness (LOC)**—the patient becomes drowsy, then difficult to arouse, then unresponsive. Other early signs include headache (often described as progressive, constant, and unresponsive to analgesia), vomiting or projectile vomiting (vomiting that occurs suddenly without preceding nausea, indicating brainstem involvement), and papilledema (swelling of the optic disc from increased ICP transmitted through the optic nerve sheath, detected on fundoscopic exam). As ICP continues to rise and brainstem structures become compressed, pupillary changes occur: initially, the pupil on the side of the lesion may dilate and become fixed (from CN III compression), followed by bilateral pupillary dilation and fixation as brainstem compression worsens. **Cushing's triad** consists of three findings: (1) rising systolic blood pressure with widening pulse pressure (the difference between systolic and diastolic pressure increases), (2) bradycardia (slow heart rate), and (3) irregular respirations (often with a pattern like Cheyne-Stokes respiration). It is critical to understand that **Cushing's triad is a LATE sign of increased ICP, not an early one**—by the time this triad is present, severe brainstem compression is occurring and herniation is imminent. Relying on Cushing's triad to detect increased ICP is a dangerous clinical error; the nurse must recognize earlier signs, particularly the decreasing LOC. Abdominal and postural signs also occur: initially, the patient may assume a decorticate position (flexion of arms, extension of legs), then as brainstem compression worsens, a decerebrate position (extension of all limbs, arching of back). These abnormal postures indicate severe brainstem dysfunction. Nursing management and priority interventions for patients at risk of increased ICP or with known increased ICP focus on preventing further ICP rise, maintaining cerebral perfusion pressure (CPP = MAP – ICP, where MAP is mean arterial pressure), and monitoring for deterioration: **Airway and Oxygenation (Maslow's highest priority):** Maintain a patent airway and ensure adequate oxygenation and ventilation. Hypoxemia and hypercapnia (elevated CO2) cause cerebral vasodilation, increasing cerebral blood volume and ICP. Avoid aggressive suctioning that causes hypoxia and increases intrathoracic pressure; limit suctioning to 10–15 seconds maximum, and allow rest between passes. If the patient is mechanically ventilated, target a PaCO2 of approximately 35–40 mmHg (mild hyperventilation to ~30–35 mmHg may be used briefly in acute crises to induce cerebral vasoconstriction, but prolonged hyperventilation is contraindicated due to worsening ischemia from vasoconstriction). **Head and Neck Position:** Elevate the head of the bed to 30 degrees (unless contraindicated, such as in acute spinal cord injury) to promote venous drainage from the skull. Keep the **head and neck in neutral alignment** (midline)—avoid turning the head sharply side to side, as this compresses the jugular vein on the dependent side and impairs venous return. This is a simple but often-overlooked intervention. Ensure the pillow is not too high (which causes neck flexion) and use only one pillow or none if possible. **Avoid Activities That Raise Intrathoracic/Intra-Abdominal Pressure:** Every Valsalva maneuver, forceful cough, straining, or Trendelenburg position increases intrathoracic and intra-abdominal pressure, which impedes venous return from the head and raises ICP. Prevent straining during defecation by administering stool softeners (docusate) and ensuring adequate fiber and hydration. Avoid vigorous chest physiotherapy or aggressive suctioning. If the patient must cough, coach gentle coughing. Cluster nursing care to allow uninterrupted rest periods. **Environment Management:** Keep the patient's room quiet, dimly lit, and at a cool temperature. Excessive noise, bright light, and environmental stimulation can trigger agitation and raise ICP. Pain and anxiety increase ICP; provide adequate analgesia and sedation as prescribed. Fever significantly increases cerebral metabolic demand and worsens outcome; manage fever aggressively with antipyretics and cooling measures. Each degree Celsius elevation in temperature increases metabolic demand by approximately 7%. **Fluid Management and Osmotic Therapy:** Prevent fluid overload, which increases cerebral edema. Monitor intake and output carefully. Maintain serum osmolality at optimal levels (mild hypertonicity helps draw fluid from brain tissue). Osmotic diuretics and hypertonic saline are key pharmacologic interventions. **CPP Monitoring:** Cerebral perfusion pressure (CPP = MAP – ICP) represents the pressure gradient driving blood flow to the brain. CPP should be maintained at approximately 60–70 mmHg (target may vary by institution). This may require vasopressors to maintain blood pressure or ICP-lowering measures if ICP is elevated. Hypotension is particularly dangerous in increased ICP because it worsens cerebral perfusion. **Frequent Neurologic Assessments:** Perform serial neurologic examinations, documenting level of consciousness (using Glasgow Coma Scale), pupil size and reactivity, motor and sensory function, speech, and presence of abnormal posturing. Changes in LOC are the earliest sign of decompensation. **Seizure Precautions:** Increased ICP and many underlying causes (stroke, trauma, tumor) carry seizure risk. Implement seizure precautions: padded side rails, suction and airway equipment at bedside, and seizure prophylaxis medications if prescribed. In the Philippine healthcare context, many patients with increased ICP are managed in intensive care units of tertiary hospitals. Nurses must understand these principles and apply them consistently, as even small improvements in ICP management can mean the difference between recovery and permanent disability or death. In smaller hospitals without ICP monitoring capability, nurses rely on clinical assessment and must recognize deterioration early to facilitate transfer to a facility with advanced ICP monitoring and neurosurgical intervention capability.

Pharmacologic agents are essential components of increased ICP management, though they work best alongside the nursing interventions described above. The major agents include osmotic diuretics, corticosteroids, and antiseizure medications. **Osmotic Diuretics—Mannitol and Hypertonic Saline:** Mannitol is an osmotically active sugar that is filtered freely by the glomerulus and not reabsorbed by renal tubules, creating an osmotic gradient that pulls water from the interstitial and intracellular spaces into the vasculature, which is then excreted in urine. This reduces cerebral edema, particularly cytotoxic edema. The typical dose is 0.25–1 g/kg IV bolus, administered over 15–30 minutes. Onset of action is approximately 15–30 minutes, with peak effect at 20–60 minutes. The duration of action is 4–6 hours; dosing is typically every 4–6 hours as needed. Nursing management of mannitol includes: (1) administering through a 0.22-micron filter (mannitol crystallizes in IV tubing if a regular filter is used); (2) monitoring serum osmolality (keep below approximately 320 mOsm/kg to avoid renal toxicity); (3) ensuring adequate renal function—do not use in patients with oliguria or anuria; (4) monitoring urine output (target adequate diuresis to avoid intravascular depletion); (5) assessing for signs of hypervolemia (in early phases) or hypovolemia and dehydration (if excessive diuresis occurs); (6) monitoring electrolytes (particularly potassium and sodium) as mannitol can cause hypernatremia and hypokalemia; and (7) watching for rebound increased ICP if the blood-brain barrier is disrupted (mannitol can cross into the interstitial space and create a reverse osmotic gradient, actually worsening edema—this is most concerning in traumatic brain injury with severe BBB disruption). Hypertonic saline solutions (typically 3% or 7.5% sodium chloride) work similarly by creating an osmotic gradient and also have anti-inflammatory and immune-modulating effects. Hypertonic saline may be infused peripherally (though central line is preferred for higher concentrations) and does not require a special filter. It is increasingly preferred over mannitol in many centers due to fewer complications and potentially superior outcomes. Dosing varies by concentration; 3% saline is often used at 0.1–1 mL/kg/hr as a continuous infusion or as a bolus for acute ICP crisis. Nursing considerations include ensuring the IV line is secure (hypertonic solutions are irritating), monitoring serum sodium and osmolality, and assessing for signs of hyperchloremic acidosis. **Corticosteroids—Dexamethasone:** Dexamethasone, a long-acting corticosteroid, is effective at reducing vasogenic edema, particularly around brain tumors where the blood-brain barrier is disrupted. A typical regimen for a brain tumor with significant peritumoral edema is dexamethasone 4 mg IV or orally every 6 hours (though dosing may vary). Dexamethasone is **NOT effective for cytotoxic edema** associated with ischemic stroke, traumatic brain injury, or hypoxic-ischemic injury. Corticosteroids carry significant side effects with prolonged use: immunosuppression, hyperglycemia, gastric ulceration (use concurrent proton pump inhibitor or H2 blocker), myopathy, and psychiatric effects. They should be used at the lowest effective dose for the shortest possible duration. In the acute phase, they are often beneficial, but prolonged high-dose corticosteroids are avoided unless specifically indicated. **Antiseizure Medications:** Patients at high risk for seizures—including those with hemorrhagic stroke, traumatic brain injury, brain tumor, or cortical involvement—are often given prophylactic antiseizure medications. Common agents include levetiracetam (Keppra) 500 mg IV or orally twice daily, or phenytoin (Dilantin) with loading dose of 15–20 mg/kg IV or orally, followed by maintenance dosing. Levetiracetam has fewer drug interactions and does not require serum level monitoring, making it increasingly preferred over phenytoin. Nursing considerations include monitoring for side effects (behavioral changes, ataxia, rash), ensuring accurate dosing and timing, and, for phenytoin, monitoring serum levels to maintain therapeutic range (10–20 mcg/mL). **Other Agents:** Sedatives (propofol, midazolam) and opioids (morphine, fentanyl) are used to reduce anxiety and pain-related ICP elevations. Benzodiazepines (diazepam, lorazepam) are used for seizure prophylaxis and management. Vasoactive drugs (norepinephrine, dopamine) may be necessary to maintain adequate cerebral perfusion pressure when ICP is elevated. Nimodipine, a calcium channel blocker, is used specifically to prevent vasospasm after subarachnoid hemorrhage from aneurysm rupture (dose: 60 mg orally or via nasogastric tube every 4 hours for 21 days, starting within 96 hours of bleed; it does not lower ICP but improves neurologic outcome by preventing vasospasm).

Traumatic brain injury (TBI) ranges in severity from mild (concussion) to severe, with outcomes ranging from full recovery to permanent disability or death. The initial injury (primary injury) is caused directly by the trauma—tearing of axons, contusions, lacerations. The secondary injury occurs afterward from hypoxia, hypotension, cerebral edema, increased ICP, and bleeding, and represents the main target of nursing management. Nurses must prevent and minimize secondary injury through meticulous airway management, oxygenation, blood pressure support, ICP precautions, and early recognition of complications. Head injuries are broadly categorized by the anatomic location of bleeding and by severity: **Epidural Hematoma:** Bleeding between the skull and the dura mater (the outermost meningeal layer), most commonly from tearing of the middle meningeal artery (which runs in grooves along the inner surface of the temporal bone). The classic presentation is a young patient (skull less adherent to dura) who suffers head trauma, loses consciousness briefly, then experiences a **lucid interval** (period of apparent recovery, alert and oriented, sometimes even talkative), followed by **rapid neurologic deterioration**—decreasing consciousness, dilated pupil (from CN III compression from uncal herniation), contralateral weakness, and death if not urgently treated. The urgency cannot be overstated: this is a neurosurgical emergency. On CT, an epidural hematoma appears as a lens-shaped (biconvex) hyperdensity that does not cross suture lines (because the dura is adhered to the skull at these lines). Treatment is emergency surgical evacuation (burr holes or craniotomy). Nursing role includes recognizing the lucid interval pattern and immediately alerting the provider. **Subdural Hematoma:** Bleeding beneath the dura mater, typically from tearing of bridging veins that cross the subdural space to drain into the superior sagittal sinus. Subdural hematoma can be acute (symptoms within 72 hours), subacute (symptoms 3–20 days), or chronic (symptoms >20 days after the inciting head injury, which patients may not even remember—especially true in older adults who are more prone to falls and chronic subdural formation). On CT, acute subdural hematoma appears as a crescent-shaped hyperdensity that **does cross suture lines** (unlike epidural). Chronic subdural may appear as a lucency (low density) as blood breaks down over time, or mixed density if there is ongoing low-grade rebleeding. Management depends on size and symptoms: small asymptomatic subdurals are monitored with serial CT; symptomatic ones are evacuated surgically. Chronic subdurals are more common in elderly patients and those on anticoagulants or antiplatelet therapy; presenting symptoms may be subtle—personality change, gradual gait decline, or just vague confusion, leading to delayed diagnosis. Rebleeding is common with chronic subdural, especially in patients on anticoagulation; the decision to continue or hold anticoagulation post-subdural is complex and must be individualized. **Subarachnoid Hemorrhage from Trauma:** Bleeding in the subarachnoid space from the traumatic tearing of cortical vessels (as opposed to aneurysm rupture). Nursing signs include blood in the CSF, meningeal irritation (neck stiffness), and increased ICP. Traumatic subarachnoid hemorrhage carries risk of vasospasm similar to aneurysm rupture (though less common); nimodipine is sometimes used. **Basilar Skull Fracture:** A fracture at the base of the skull, often from severe trauma. Classic presentations include: - CSF rhinorrhea (clear fluid leaking from the nose) or otorrhea (clear fluid leaking from the ear)—the fluid can be distinguished from serous drainage by positive glucose on dipstick (CSF contains glucose, serous fluid does not) or the halo/ring sign (when CSF-containing drainage is placed on white gauze or filter paper, a ring of clear fluid spreads outward around a central blood clot). Important nursing point: **never pack the nose or ears** with gauze or attempt to stop the leak, as this may force CSF into tissues and increase infection risk; simply observe and allow drainage to flow out. Also, **avoid nasogastric tube insertion nasally or nasal suctioning**, as the tube may pass through the fracture into the cranial vault. - 'Raccoon eyes'—periorbital ecchymosis (bruising around both eyes) from anterior basilar fracture - 'Battle's sign'—ecchymosis over the mastoid process behind the ear from temporal/mastoid basilar fracture - Hemotympanum—blood visible behind the tympanic membrane Management is supportive; most basilar skull fractures heal without specific intervention. Prophylactic antibiotics are controversial but sometimes used. High concern is post-traumatic meningitis from bacterial invasion through the fracture site, so nurses must educate patients on signs (fever, neck stiffness, headache, altered mental status) and need for evaluation if symptoms develop. **Concussion (Mild TBI):** A brief disturbance of consciousness or altered mental status from trauma, without structural brain injury on imaging. Symptoms include headache, dizziness, confusion, memory problems (difficulty remembering events surrounding the injury or new information), and sometimes post-concussive syndrome (persistent symptoms lasting weeks to months). Management includes rest (physical and cognitive), gradual return to activities, and monitoring for second-impact syndrome (rare but severe—a second concussion before full recovery from the first can cause rapid, severe brain swelling and death, so concussed athletes must be cleared medically before returning to contact sports). General nursing management of head-injured patients focuses on preventing secondary injury: maintain airway patency and adequate oxygenation, control bleeding with direct pressure (not packing), manage pain and agitation, implement ICP precautions (elevate head of bed 30°, keep neck midline, avoid Valsalva, fever management), perform frequent neurologic assessments to detect deterioration, and ensure fluid and electrolyte balance. Many head-injured patients develop syndrome of inappropriate antidiuretic hormone secretion (SIADH) with hyponatremia, requiring careful fluid restriction and monitoring of serum sodium. Seizure prophylaxis is indicated for high-risk patients. In the Philippine context, many TBI patients present late with severe injuries due to delays in reaching hospitals; rapid triage and transfer to neurosurgical facilities is essential.

Brain tumors are classified as primary (arising from brain tissue, meninges, or pituitary) or metastatic (spreading from cancer elsewhere, such as lung, breast, or melanoma). Even benign primary tumors are dangerous because they occupy space within the rigid skull, raising intracranial pressure. Common primary brain tumors include gliomas (astrocytoma, oligodendroglioma, glioblastoma—the most aggressive and common), meningiomas (arising from the meninges, usually benign but can compress brain tissue), and pituitary adenomas. Metastatic tumors are more common overall than primary brain tumors. Clinical manifestations depend on tumor location and size but commonly include: **headache** (often the first symptom, frequently worse in the morning when ICP is higher from recumbent position and impaired CSF absorption during sleep), **seizures** (especially with cortical involvement or slow-growing tumors that irritate cortex), **focal neurologic deficits** (weakness, sensory changes, speech difficulties, vision changes depending on location), **personality change or cognitive decline** (from involvement of frontal or temporal lobes), **nausea and vomiting** (from increased ICP or brainstem involvement), and **signs of increased ICP** (papilledema, decreasing consciousness). Diagnosis is by MRI with gadolinium contrast enhancement (CT is used if MRI is contraindicated or for acute evaluation when intracranial hemorrhage must be quickly ruled out). Biopsy may be performed to obtain tissue diagnosis and grade the tumor. Some tumors are diagnosed incidentally when imaging is done for other reasons. Treatment modalities include surgical resection (craniotomy—opening the skull to access and remove the tumor), radiation therapy (external beam radiation or stereotactic radiosurgery—focused radiation), chemotherapy, and sometimes combination approaches. Corticosteroids (dexamethasone) are used preoperatively and post-operatively to reduce peritumoral vasogenic edema and improve neurologic function. **Postoperative Craniotomy Nursing Care:** After craniotomy (tumor resection, aneurysm clipping, hematoma evacuation, or other neurosurgical procedures), nursing care is highly specialized and critical to preventing complications: 1. **Neurologic Assessments:** Perform strict, frequent neuro checks—every 15 minutes to 1 hour depending on the patient's stability. Document level of consciousness, pupil size and reactivity, motor and sensory function, speech, and presence of abnormal posturing using a standardized tool like the Glasgow Coma Scale. Any change warrants immediate notification to the surgeon. 2. **ICP Precautions:** Implement all measures to prevent increased ICP: elevate head of bed 30° (unless the surgical approach dictates otherwise), keep head and neck midline and neutral, avoid Valsalva and straining (stool softeners essential), keep environment quiet and cool, manage pain and fever. 3. **Positioning:** Position depends on the surgical approach. After a supratentorial (above the tentorium) resection, elevate head of bed 30°. After an infratentorial (below the tentorium, in the posterior fossa) resection, keep patient flat for the first 24–48 hours to prevent rapid decompression (the posterior fossa is smaller and rapid decompression can cause herniation), then gradually elevate. Always clarify the surgical approach with the surgeon. 4. **Wound Care:** Monitor the surgical site for signs of infection (fever, increasing redness, drainage, dehiscence). Wound care follows institutional protocols; sutures/staples are typically removed in 7–10 days. Ensure the scalp incision is kept clean and dry. Some institutions use a specific head dressing; others leave it uncovered. 5. **Seizure Precautions:** Implement seizure precautions (padded side rails, suction and airway at bedside, seizure medication dosing accuracy) because craniotomy, tumor resection, and cortical manipulation increase seizure risk. Antiseizure prophylaxis is typically given for at least the first few days. 6. **Complications Monitoring:** Watch for: - **Increased ICP:** Decreasing LOC, headache, vomiting, pupillary changes—manage with head elevation, ICP precautions, osmotic therapy, and notify surgeon immediately. - **Hemorrhage:** Excessive drainage from the incision (small amounts are normal), hematoma collection (usually evident on postoperative imaging). - **Infection/Meningitis:** Fever, neck stiffness, headache, photophobia, altered mental status—obtain cultures and start empiric antibiotics per protocol if suspected. - **CSF Leak:** Drainage from the incision that tests positive for glucose or shows a halo sign—notify surgeon; may require simple dressing change or rarely, lumbar drain placement. - **Cerebral Edema:** Increases over the first 48–72 hours post-op and gradually resolves; managed with corticosteroids, osmotic therapy, and ICP precautions. 7. **Fluid and Electrolyte Management:** Monitor intake and output; many post-craniotomy patients develop SIADH from pituitary manipulation or stress, resulting in hyponatremia and fluid retention. Check serum sodium and osmolality; may require fluid restriction. Some patients develop diabetes insipidus (from pituitary/hypothalamic injury), presenting with polyuria and hypernatremia; manage with fluid replacement and sometimes desmopressin (DDAVP). 8. **Pain and Comfort:** Provide analgesia as prescribed; post-operative headache is common and should be managed. Ice packs to the head (if not contraindicated) may help. Ensure comfort measures without compromising ICP management. 9. **Mobilization and Activity:** Early mobilization is beneficial but must be balanced against ICP management. Typically, patients are kept on bed rest for the first 24 hours, then gradually mobilized. Avoid activities that increase ICP (straining, Valsalva). 10. **Patient and Family Education:** Teach about activity restrictions (no heavy lifting, straining, or Valsalva for 4–6 weeks post-op), seizure precautions if applicable, signs of complications requiring immediate evaluation (fever, severe headache, vision changes, weakness, confusion), medication adherence (including corticosteroids with tapering schedule), and follow-up appointments for wound check, imaging, and radiation/chemotherapy planning if needed. Hair regrowth may take months; some patients experience postoperative hair loss from stress or anesthesia. Emotional support is important, as many patients experience mood changes post-craniotomy.

Patients with acute stroke, TBI, increased ICP, and brain tumors face multiple complications during acute hospitalization and recovery. Nurses must anticipate and prevent these, providing education to patients and families for long-term management and secondary prevention. **Acute Phase Complications:** 1. **Aspiration Pneumonia:** Many stroke patients and those with decreased LOC have dysphagia (difficulty swallowing). Undetected or inadequately managed dysphagia leads to aspiration of food, fluids, or saliva into the lungs, causing pneumonia. Nursing interventions include: performing a bedside swallowing screen (simple test where patient drinks water and coughs—if no difficulty, may be safe to advance diet; if coughing or difficulty, request speech-language pathology evaluation), keeping patient NPO until swallowing assessment completed, positioning upright during eating (if able), providing thickened liquids and appropriate diet consistency as tolerated, and maintaining oral hygiene. Some patients require nasogastric or percutaneous endoscopic gastrostomy (PEG) feeding tube placement. In the Philippine healthcare context, many patients are fed by family members; nurses must educate families on dysphagia precautions and proper feeding techniques. 2. **Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE):** Immobilized patients with stroke, TBI, or post-craniotomy are at high risk for venous thromboembolism. Prevention measures include: early mobilization (as tolerated given ICP status), sequential compression devices (SCDs) on lower extremities, leg exercises, adequate hydration, and pharmacologic prophylaxis (unfractionated heparin or low-molecular-weight heparin) if not contraindicated (no active bleeding, no recent intracranial hemorrhage or severe thrombocytopenia). Assess legs daily for unilateral swelling, warmth, or pain; if suspected DVT, do not massage the leg (risk of embolization), elevate the limb, and notify the provider. 3. **Contractures and Pressure Injuries:** Immobilized patients, especially those with hemiparesis, develop joint contractures and pressure injuries. Prevention includes: frequent position changes every 2 hours, passive range-of-motion exercises (or active-assisted if patient is able), proper positioning (footboard to prevent footdrop, pillows between knees and ankles, arm support), skin inspection daily for pressure areas, use of pressure-redistribution mattresses or overlays, and ensuring nutrition is adequate (pressure injuries heal poorly with malnutrition). 4. **Infection (UTI, Pneumonia, Wound Infection):** Catheterized patients are at risk for urinary tract infection; maintain aseptic technique during catheter insertion, use closed catheter systems, and remove catheters as soon as possible (transition to bedpan/urinal when able). Respiratory infection risk is high with immobility and dysphagia. Surgical wound infection is a serious complication post-craniotomy; maintain wound asepsis, monitor for fever and wound drainage, and report signs of infection immediately. 5. **Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH):** Common post-stroke, post-TBI, and post-craniotomy, causing hyponatremia from excessive ADH release and fluid retention. Clinical signs include confusion, altered mental status, headache, and seizures. Management includes fluid restriction (typically 500–1000 mL/day), hypertonic saline (3%) for symptomatic hyponatremia with seizures, and treatment of the underlying cause. Monitor serum sodium frequently; correct sodium gradually (no faster than 10–12 mEq/L per 24 hours) to avoid osmotic demyelination syndrome. 6. **Seizures:** Patients with stroke, TBI, tumor, or hemorrhage are at risk. Use antiseizure prophylaxis as prescribed; educate patients on medication adherence. If seizure occurs, protect from injury, turn to side, do not force objects into mouth, and notify provider. **Chronic Phase Complications and Rehabilitation:** 1. **Hemiparesis and Functional Limitation:** Many stroke survivors have persistent weakness affecting mobility and independence. Rehabilitation (physical therapy, occupational therapy, speech-language pathology) is essential, beginning early and continuing for months. Spasticity (involuntary muscle tone increase) may develop; manage with stretching, positioning, and medications (baclofen, botulinum toxin) if severe. 2. **Aphasia and Speech/Cognitive Deficit:** Expressive aphasia (Broca's area) impairs speech production; receptive aphasia (Wernicke's area) impairs comprehension. Patients may become frustrated with communication barriers. Nursing interventions include: speaking slowly and clearly, using simple sentences, augmenting with gestures and pictures, giving the patient time to respond, and involving speech-language pathology early. Cognitive deficits (memory, attention, executive function) may persist; use reminder notes, structured routines, and caregiver support. 3. **Unilateral Neglect (right-hemisphere stroke):** Patient ignores the affected side (often the left). Nursing interventions include: positioning objects on the unaffected side initially (to prevent injury from not seeing the affected side), then gradually moving them toward the affected side to encourage scanning, reminding the patient to look to the affected side, and using verbal cuing (e.g., 'your left arm is on the armrest'). 4. **Hemianopia (loss of visual field):** Patient has loss of vision in one half of the visual field. Teach patient to scan (turn head to see the missing field), position objects in the intact visual field, and provide environmental modifications (mirrors to expand visual field). 5. **Poststroke Mood and Behavioral Changes:** Depression is common after stroke and may impair rehabilitation. Screen for depression using standardized tools; provide counseling and antidepressant medications if needed. Emotional lability (uncontrolled crying or laughing) may occur; educate family that this is not volitional. Some patients develop apathy; involve them in activities and provide motivation. 6. **Caregiver Burden:** Family members managing stroke survivors often experience emotional and physical stress. Support groups, respite care, and resources should be offered. **Patient and Family Education for Secondary Prevention:** For stroke survivors and TIA patients, secondary prevention (preventing recurrent stroke) is critical. Education points include: 1. **Medication Adherence:** Antiplatelet therapy (aspirin, clopidogrel), anticoagulation (if atrial fibrillation or cardioembolism), statin therapy, and antihypertensive medications must be taken consistently. Non-adherence is a major cause of recurrent stroke. Use pill organizers, set phone reminders, and discuss barriers to adherence. 2. **Blood Pressure Control:** Hypertension is the most modifiable risk factor. Target BP is typically <140/90 mmHg (or per individual guidelines). Teach home BP monitoring, importance of consistent medication taking, sodium restriction, weight loss if overweight, and regular follow-up. 3. **Diabetes Management:** If diabetic, maintain good glucose control (HbA1c target typically <7% or per individual target); check blood glucose at home if on insulin or certain oral medications; eat regular meals; exercise; attend diabetes education. 4. **Dyslipidemia Management:** Take statin and other lipid-lowering medications as prescribed; adhere to a heart-healthy diet (low saturated fat, cholesterol, sodium; high fiber, fruits, vegetables); aim for LDL <70 mg/dL post-stroke. 5. **Smoking Cessation:** Smoking significantly increases stroke risk. Provide cessation counseling, pharmacotherapy (nicotine replacement, varenicline, bupropion), and referral to cessation programs. Emphasize that this is the single most important modifiable factor for some patients. 6. **Physical Activity:** Aim for at least 150 minutes of moderate-intensity aerobic activity per week (or as tolerated given recovery status), plus strength training 2–3 days per week. Discuss what activities are safe given the patient's deficits; involve physical therapy. 7. **Diet:** Mediterranean diet or DASH diet is recommended. Emphasis on reducing sodium, increasing fruits and vegetables, whole grains, lean proteins, and limiting alcohol. Refer to dietitian for individualized counseling. 8. **Atrial Fibrillation Screening and Anticoagulation:** If not previously diagnosed with atrial fibrillation, some stroke survivors are found to have paroxysmal (intermittent) AFib. Patient education on symptom recognition (palpitations, shortness of breath), the importance of anticoagulation (if indicated) for AFib stroke prevention, and the need for follow-up ECG or Holter monitoring if AFib is suspected. 9. **FAST Recognition and Action Plan:** Teach patient and family the FAST warning signs of stroke: Face drooping, Arm weakness, Speech difficulty, Time to call emergency. Emphasize 'time is brain'—if these symptoms occur, call emergency (911 in US, 117 or local emergency in Philippines) immediately. Discuss what to do if symptoms occur (note the time, call EMS, do not drive self, bring medication list to hospital). 10. **Follow-up Care:** Emphasize importance of regular follow-up with primary care physician, neurologist (if stroke was due to unusual cause or recurrent TIAs), cardiologist (if cardiac disease present), and specialists (ophthalmology for vision, speech-language pathology, physical medicine & rehabilitation). Explain the purpose of imaging follow-up (carotid ultrasound, brain MRI) and how it guides further prevention strategies.

In the Philippines, the Revised Nursing Law (RA 9173, Republic Act No. 9173, enacted in 2002) defines the scope of nursing practice and establishes standards for registered nurses (RNs). Registered nurses in the Philippines are authorized to perform a range of functions from health promotion and disease prevention to care of the ill and disabled, including those with cerebrovascular disorders and increased ICP. Key aspects of the Philippine nursing scope relevant to cerebrovascular and neurosensory disorders include: **Prevention and Health Promotion:** Philippine nurses play a vital role in primary prevention of stroke and head injury, particularly in community and primary health center (RHU) settings. This includes patient education on hypertension control, smoking cessation, diabetes management, healthy diet, and physical activity. Nurses conduct health screening programs identifying at-risk individuals and ensure referrals to appropriate care. In barangay health stations (BHS), nurses provide basic health education and screening. **Early Recognition and Rapid Referral:** Nurses in all settings must recognize acute stroke and TIA symptoms using FAST criteria and ensure rapid transport to a facility capable of providing thrombolytic therapy or neuroimaging. In the Philippine healthcare system, where many secondary and rural hospitals lack CT scanning or neurology expertise, the role of nurses in ensuring rapid transfer to tertiary centers is critical. RA 9173 empowers nurses to make clinical judgments about acuity and advocate for appropriate patient transfers. **Direct Care and Nursing Interventions:** RNs in acute care (particularly in tertiary hospitals and specialty units) provide direct nursing care including airway management, vital sign monitoring, neurologic assessment, medication administration, wound care, and implementation of ICP precautions. Advanced nursing practice roles (nurse specialists, clinical nurse specialists) provide expert consultation on complex neurosensory patients. **Patient and Family Education:** RA 9173 recognizes patient education as a core nursing function. Nurses educate patients and families on medication adherence, activity restrictions, dietary modifications, recognizing warning signs, and accessing follow-up care. This is particularly important in the Philippine context where community support and family involvement in care are central to health outcomes. Language and health literacy must be considered; nurses should use simple language, local context, and teach-back methods to ensure understanding. **Documentation and Advocacy:** Nurses must accurately document neurologic assessments, changes in patient status, and interventions. RA 9173 also emphasizes the nurse's role as patient advocate, ensuring that patients receive appropriate care and that their concerns are heard by the healthcare team. For stroke patients, nurses advocate for timely imaging, thrombolytic eligibility assessment, and rehabilitation services. **Interdisciplinary Collaboration:** Managing cerebrovascular disorders and increased ICP requires collaboration with physicians, neurosurgeons, neuroradiologists, physiotherapists, speech-language pathologists, dietitians, and social workers. Nurses serve as coordinators of care, ensuring communication among team members and that care plans are implemented consistently. **Limitations and Scope Boundaries:** While RA 9173 grants RNs significant autonomy in many areas, certain invasive procedures (e.g., intubation, central venous catheter placement, intracranial pressure monitoring device insertion) remain within the scope of physicians or specialized nurses with additional training. Nurses work within their competence and seek supervision or referral when managing complex patients outside their expertise. **Addressing Health Inequities in Philippine Settings:** Many Filipinos lack timely access to advanced neuroimaging and thrombolytic therapy due to geographic location or economic barriers. Nurses can advocate for improved healthcare infrastructure, support the establishment of primary and comprehensive stroke centers, and ensure that vulnerable populations (rural residents, poor families) receive appropriate referrals and education. Public health campaigns on stroke prevention and recognition can be led by nurses in partnership with local government units. **Continuing Professional Development:** As cerebrovascular care evolves (e.g., mechanical thrombectomy becoming more available in Philippine centers), nurses must engage in lifelong learning through in-service education, continuing education courses, and professional reading to maintain competence. The Philippine Nurses Association (PNA) provides resources and standards to support nurses' professional growth.