NLE Psychiatric Disorders — Cognitive, Organic, and Neurodevelopmental DisordersSummary

Delirium is an acute, reversible state of confusion caused by an underlying medical or physiological disturbance. It is a medical emergency that demands immediate identification and treatment of the precipitating cause. Characterized by sudden onset (over hours to days), fluctuating course (especially worse at night—'sundowning'), altered level of consciousness (may be hyperalert, drowsy, or shifting), and markedly impaired attention—the hallmark feature. Common reversible causes include infection (urinary tract infections and pneumonia are classic in elderly patients), electrolyte imbalance, hypoxia, hypoglycemia, dehydration, medications and polypharmacy, drug/alcohol withdrawal, post-anesthesia state, and pain. In the Philippine healthcare context, delirium in older adults admitted to tertiary hospitals is frequently overlooked as 'just confusion' when it represents an acute UTI or pneumonia requiring antibiotic therapy. As a nurse, recognizing delirium's fluctuating nature—observing that confusion worsens at specific times or with specific triggers—is your first step in trending mental status and alerting the physician to investigate.

Dementia is a chronic, progressive, and generally irreversible decline in cognitive function with onset gradual over months to years. Course is slowly progressive and stable within a day—does not fluctuate hour-to-hour like delirium. Level of consciousness remains normal until very late stages. Memory loss occurs in a predictable pattern: recent (short-term) memory is impaired first, with remote memory preserved longer (a patient may forget today's breakfast but recall events from 20 years ago). Key differentiator: dementia develops insidiously; family often reports 'he's been getting more forgetful for the past year.' Reversible causes (B12 deficiency, hypothyroidism) must be excluded, but most dementias are irreversible. In Philippine clinical settings, older adults with dementia are often cared for in community health centers and home-based care programs; nurses play a vital role in family education and caregiver support.

The key clinical discriminators that must be committed to memory are: (1) ONSET—delirium sudden (hours to days) vs. dementia gradual (months to years); (2) COURSE—delirium fluctuating and worse at night vs. dementia slowly progressive and stable through day; (3) CONSCIOUSNESS—delirium altered/clouded vs. dementia usually clear until late; (4) ATTENTION—delirium markedly impaired (hallmark feature) vs. dementia relatively preserved early; (5) REVERSIBILITY—delirium usually reversible vs. dementia usually irreversible. A crucial clinical insight: a patient with known dementia can develop superimposed delirium. Any sudden worsening in a person with established dementia must be treated as possible acute delirium and investigated for medical causes. This is patient-safety critical because the family may attribute acute confusion to 'just getting worse from the dementia' when the patient actually has a UTI or aspiration pneumonia requiring urgent treatment.

Alzheimer's disease is the most common cause of dementia, a progressive, irreversible neurodegeneration associated with accumulation of beta-amyloid plaques and neurofibrillary tangles in the brain. These pathologic changes destroy neurons, particularly in memory centers. Clinical presentation includes the classic '4 A's': (1) Aphasia—loss of language ability; patient speaks in shorter sentences, then single words, then becomes nonverbal; (2) Apraxia—inability to perform learned motor tasks (e.g., patient forgets how to use a fork or button a shirt); (3) Agnosia—inability to recognize familiar objects or people (patient may not recognize own spouse); (4) Amnesia—progressive memory loss starting with recent memory. Additional features include confabulation (filling memory gaps with invented information—patient creates false but plausible memories), perseveration (repeating words, phrases, or actions involuntarily), and sundowning (increased confusion, agitation, anxiety in late afternoon/evening). Disease progression is typically divided into early (mild forgetfulness, occasional confusion), middle (increased memory loss, wandering, behavioral changes, need for supervision), and late (severe cognitive decline, nonverbal, total dependence for ADLs, bedridden) stages. In Philippine nursing practice, Alzheimer's often goes undiagnosed in older adults, particularly in rural areas; nurses in primary care settings play a key role in recognition and early referral.

Medications used in Alzheimer's disease do not cure or reverse the disease; they slow cognitive decline at best. Cholinesterase inhibitors (donepezil, rivastigmine, galantamine) increase the level of acetylcholine in the brain, a neurotransmitter crucial for memory. Used in mild-to-moderate Alzheimer's disease. Nursing considerations: monitor for cholinergic side effects including bradycardia (slowed heart rate—important in older adults who may already have cardiac issues), GI upset, nausea, diarrhea, and increased salivation. Give medication with food if GI distress occurs. Memantine is an NMDA-receptor antagonist used in moderate-to-severe disease and may be combined with a cholinesterase inhibitor for additive benefit. Memantine protects neurons from excessive glutamate excitotoxicity. All of these medications must be monitored for efficacy (does the patient's decline slow?) and adverse effects. In Philippine practice, cost and availability of these medications may limit their use; nurses must be knowledgeable advocates for appropriate pharmacotherapy and realistic about what these drugs can and cannot accomplish.

The single overarching nursing priority in Alzheimer's care is SAFETY, followed by maintaining a consistent, familiar environment. Safety concerns include wandering (one of the most distressing symptoms for families), falls, burns, and injuries from impaired judgment. Specific safety interventions: secure or alarmed doors/windows, identification bracelet or GPS device, remove hazardous objects, supervise cooking/bathing, ensure adequate lighting, and provide comfortable walking areas. Maintain a consistent, structured routine with the same caregivers when possible—sudden changes provoke distress and agitation. Use simple, calm communication: short sentences, one instruction at a time, face the patient, allow time to respond. Manage sundowning (often the most distressing time for families) by increasing daytime light and activity, reducing evening stimulation, playing soft music, and creating a soothing environment. Reorientation is appropriate in early-to-middle disease ('This is Tuesday, September 15th at 2 PM'); however, as disease advances and the patient becomes unable to process new information, validation therapy becomes more therapeutic than repeated correction. Validation means acknowledging the patient's feelings and emotions ('I see this is upsetting you') rather than arguing about facts ('No, your mother died 10 years ago'). Support ADLs with cueing and assistance; prevent immobility complications in late stages through turning, range-of-motion, and skin care. Critically, support the family/caregiver—caregiver strain is profound; provide education, respite care referrals, and connection to community resources such as the Alzheimer's Association.

ADHD is a neurodevelopmental disorder of childhood (often persisting into adulthood) characterized by a persistent pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning and appears in multiple settings (home, school, work). The inattentive presentation includes difficulty sustaining attention, easy distractibility, careless mistakes, difficulty organizing tasks, and forgetfulness. The hyperactive-impulsive presentation includes fidgeting, inability to remain seated, excessive talking, difficulty waiting turns, and interrupting others. For diagnosis, symptoms must have onset before age 12, persist for at least 6 months, and cause functional impairment. Children with ADHD have difficulty with executive function—planning, organizing, impulse control, and emotional regulation—not low intelligence. In Philippine schools, ADHD is increasingly recognized; nurses in school health services are often first to identify and refer children for evaluation. Untreated ADHD leads to academic failure, social difficulties, and low self-esteem.

Stimulant medications (methylphenidate and amphetamine-based preparations) are first-line pharmacologic treatment for ADHD. These medications paradoxically calm hyperactivity and improve focus by increasing dopamine and norepinephrine in the prefrontal cortex, enhancing executive function. Critical nursing consideration: administer stimulants in the morning and NOT late in the day to prevent insomnia. Monitor for appetite suppression—a common side effect that can impact growth and weight in children; administer after meals and monitor height and weight at regular intervals. Monitor vital signs for increased heart rate and blood pressure. Educate families about the importance of consistent medication timing and the dangers of medication sharing/diversion (stimulants are controlled substances). Atomoxetine (a non-stimulant selective norepinephrine reuptake inhibitor) is an alternative for children who cannot tolerate stimulants or have cardiac contraindications. In Philippine settings where stimulant medications may have limited availability, nurses must be knowledgeable about behavioral and environmental strategies as alternative first-line interventions.

Non-pharmacologic management is as important as medication. Provide a structured, consistent environment with clear rules, routines, and expectations. Reduce environmental distractions (quiet study area, minimize background noise). Break tasks into small, manageable steps with frequent check-ins. Give clear, simple directions, one at a time. Use consistent, immediate positive reinforcement for desired behaviors and firm, consistent limit-setting for inappropriate behavior. Avoid harsh punishment, which damages self-esteem further. Build on the child's strengths and interests. Collaborate with parents and teachers to ensure consistency across settings. Advocate for appropriate educational accommodations (individualized education plan/IEP in schools). Support the child's self-esteem, which is often damaged by years of criticism and failure. In Philippine context, many schools lack formal ADHD recognition systems; nurses play a vital advocacy role in educating teachers and families about ADHD as a medical condition, not laziness or bad behavior.

Autism spectrum disorder (ASD) is a neurodevelopmental disorder with onset in early childhood (often recognized by age 2-3 years), defined by two core domain deficits: (1) Persistent deficits in social communication and social interaction—poor eye contact, difficulty with social-emotional reciprocity ('back-and-forth' interaction), trouble developing and maintaining relationships, impaired verbal communication (may be nonverbal, echolalic, or have unusual speech patterns), and impaired nonverbal communication (unusual gestures, facial expressions, body language); (2) Restricted, repetitive patterns of behavior, interests, or activities—stereotyped or repetitive motor movements (hand-flapping, spinning, rocking), insistence on sameness and routine (changes cause extreme distress), intense circumscribed interests (might obsess about trains or numbers), and unusual sensory sensitivities (covers ears at loud sounds, avoids certain textures, lines up toys rather than imaginative play). ASD exists on a spectrum; severity ranges from those requiring very substantial support (nonverbal, significant self-injurious behavior, profound social deficits) to those who are highly verbal and independent, formerly called 'high-functioning autism' or Asperger syndrome (now integrated into ASD diagnosis). The key is the presence and severity of social-communication deficits and restricted/repetitive patterns—not IQ alone. In Philippines, ASD is increasingly recognized in urban centers but may be missed in rural areas; early identification is critical for outcomes.

The overarching principle is: maintain consistency and routine—sudden changes provoke significant distress and behavioral escalation. Prepare the child for transitions using visual schedules and advance notice ('In 5 minutes, we will transition from playtime to snack time'). Ensure safety and reduce overwhelming sensory stimulation (use soft lighting, minimize loud noises, provide a quiet refuge space). Communicate at the child's developmental and cognitive level using clear, concrete language with visual supports (picture cards, written schedules). Avoid figurative language and idioms, which the child interprets literally. Build on the child's strengths and special interests as motivators for learning and engagement. Reinforce desired behaviors consistently. Support the child's communication using their preferred method (verbal, sign language, AAC device, PECS—Picture Exchange Communication System). There is no cure for autism; early behavioral intervention (applied behavior analysis/ABA, structured education, speech and occupational therapy) during the critical developmental window (ages 2-6) improves outcomes significantly. Medications are used only to manage co-occurring symptoms (irritability, aggression, anxiety, sleep disturbance), not to treat autism itself. Support families, who often experience grief and guilt; provide education about realistic expectations, community resources, and neurodiversity perspective (autism as neurological difference, not disorder to be 'fixed').

Intellectual disability (ID) is a neurodevelopmental disorder with onset during the developmental period (before age 18), defined by deficits in two domains: (1) Intellectual functioning—significantly below average reasoning, problem-solving, learning, memory, and judgment (typically IQ below 70); (2) Adaptive functioning—deficits in communication skills, self-care skills (hygiene, dressing, toileting), social skills, and practical/independent living skills (managing money, using transportation, following safety rules). Severity is no longer classified by IQ alone but by the level of support needed—from minimal support ('mild' ID; the person may live independently with support) to pervasive support ('severe' ID; the person requires 24-hour care). Causes include genetic conditions (Down syndrome [Trisomy 21], fragile X syndrome), prenatal exposures (fetal alcohol syndrome is a leading preventable cause in some regions), birth injury and hypoxia, and infections (congenital rubella, congenital toxoplasmosis). Early intervention starting in infancy (speech therapy, occupational therapy, physical therapy) improves outcomes. In Philippine public health, prevention through prenatal care, newborn screening, and maternal nutrition is critical; nurses in primary health care units play a vital role in early identification and family support.

The nursing goal in caring for children and adults with intellectual disability is to promote the highest possible level of independence and social integration through individualized habilitation (teaching of skills needed for independent functioning—different from rehabilitation, which restores lost skills). Key principles: (1) Use simple, concrete, step-by-step instruction repeated consistently; (2) Break complex tasks into smaller, manageable steps; (3) Use positive reinforcement and repetition; (4) Teach self-care and adaptive skills (dressing, toileting, eating, hygiene) with cueing and assistance; (5) Ensure safety—the person may not understand danger or social rules; (6) Support communication at the person's level; (7) Prevent exploitation and abuse (intellectual disability increases vulnerability); (8) Involve and educate the family/caregivers. Education (special education programs starting in childhood) should focus on functional academics (reading signs, counting money) and life skills rather than traditional academics. In Philippine community health centers, nurses screen for developmental delay at well-child visits and refer early for evaluation and services. Prevention is equally important: advocate for adequate prenatal care, folic acid supplementation (prevents neural tube defects), maternal alcohol/drug avoidance, rubella immunization, and newborn screening programs.

For patients with cognitive and neurodevelopmental disorders, common NANDA nursing diagnoses include: Risk for Injury (related to impaired judgment, wandering, falls); Impaired Verbal Communication (related to aphasia, language deficits); Self-Care Deficit (related to apraxia, progressive dementia); Caregiver Role Strain (related to demands of care); Confusion, Acute or Chronic (depending on delirium vs. dementia); Anxiety (related to confusion, fear, routine changes); Sleep Disturbance (related to sundowning, altered sleep-wake cycle); Ineffective Coping (related to loss of function). Prioritization using Maslow's hierarchy and clinical judgment: safety needs (risk for injury) take precedence over comfort or learning needs. In delirium, physiologic needs (treat underlying cause, maintain hydration/nutrition, prevent falls) are paramount; in dementia, safety and self-care take priority; in ADHD, emotional safety (self-esteem, prevention of injury from impulsivity) and educational needs are priority. Documentation and care planning must reflect understanding of whether disorder is acute/reversible (delirium) or chronic/progressive (dementia) because this determines intensity and type of intervention.

Both delirium and dementia present as cognitive dysfunction, but they are opposite in every clinically meaningful way: onset, course, reversibility, and prognosis. Understanding this relationship is foundational; the nurse recognizes that a patient with cognitive complaints could have either disorder (or both), and the clinical presentation guides assessment and intervention. A patient presenting with acute confusion over hours requires delirium workup and treatment of underlying cause; a patient with insidious memory loss over months requires dementia evaluation and supportive, progressive care planning.

Alzheimer's disease involves loss of cholinergic neurons; cholinesterase inhibitors (donepezil, rivastigmine, galantamine) preserve acetylcholine by blocking its breakdown. This pathophysiologic understanding explains both the modest benefit of these drugs and their mechanism—they slow, not reverse, neuronal loss. The same understanding explains side effects (cholinergic effects: bradycardia, GI upset) and guides monitoring. Nurses who understand the mechanism can educate families about realistic expectations and recognize that benefit may be subtle—slowing decline rather than improving function.

Executive function—the ability to plan, organize, control impulses, and regulate emotion—is impaired in ADHD but is not a primary deficit; the ADHD child's reasoning and learning may be normal. In intellectual disability, executive function deficits are part of overall cognitive impairment. This relationship clarifies that ADHD and intellectual disability are distinct: a child can have ADHD with normal intelligence, or intellectual disability with typical attention and impulse control (though intellectual disability often impacts executive function secondarily).

Both autism spectrum disorder and intellectual disability can include impaired communication and social skills. However, the underlying cause differs: autism is primarily a neurodevelopmental difference in how the brain processes social and sensory information, while intellectual disability reflects global cognitive impairment. A child can have both conditions (autism + intellectual disability), but they are distinct diagnoses. Recognizing this relationship helps nurses differentiate: an autistic child may be highly intelligent but struggle with social reciprocity; a child with intellectual disability but without autism may be socially engaged but cognitively delayed overall.

Maintaining a consistent, structured environment is a priority intervention across multiple disorders: for delirium (reduces confusion and agitation), for Alzheimer's dementia (prevents sundowning escalation and wandering), for ADHD (reduces distractions and supports executive function), and for autism (prevents distress from unexpected changes). This relationship highlights that certain nursing interventions are universally therapeutic for patients with cognitive and neurodevelopmental vulnerabilities; predictability reduces behavioral and emotional dysregulation.

Whether caring for a patient with delirium (acute crisis), Alzheimer's dementia (chronic progressive decline), ADHD (behavioral challenges), autism (needs for routine and support), or intellectual disability (lifelong dependence), family caregivers experience profound physical, emotional, and financial strain. Recognizing this shared burden across diagnostic categories helps nurses prioritize caregiver assessment and support—including respite care, education, and connection to community resources—as integral to comprehensive care, reflecting Level 2 (intermediate) nursing practice responsibility under RA 9173.