Vital Signs & Basic Physiologic Monitoring - Cheat Sheet
Your last-minute revision companion for vital signs assessment, normal ranges, deviations, and critical nursing interventions. This is exam-ready reference material organized for rapid recall during the final 30 minutes before the NLE.
Temperature Assessment & Management
Formulas
°F = (°C × 9/5) + 32
Meaning
°F = Fahrenheit; °C = Celsius
Watch out
Do NOT confuse the order — multiply by 9/5 FIRST, then add 32. Reverse for Celsius: subtract 32, then multiply by 5/9.
When to use
Convert between temperature scales on any NLE question
Fever pattern identification: Oral temp baseline ~36.5°C
Meaning
Normal adult oral temperature reference point
Watch out
Remember: rectal is ~0.5°C HIGHER; axillary is ~0.5°C LOWER than oral — this is heavily tested.
When to use
Use as anchor for calculating deviations and fever severity
Common values
Value
36.5–37.5°C (average 37.0°C)
Symbol
T
Quantity
Normal adult oral temperature
Value
~37.5–38.0°C (0.5°C higher than oral)
Symbol
T_rectal
Quantity
Normal adult rectal temperature
Value
~36.0–36.5°C (0.5°C lower than oral)
Symbol
T_axillary
Quantity
Normal adult axillary temperature
Value
>41°C
Symbol
Danger zone
Quantity
Hyperpyrexia threshold
Value
<35°C
Symbol
T_hypo
Quantity
Hypothermia threshold
Value
4 grams/day
Symbol
Max_acetaminophen
Quantity
Paracetamol maximum daily dose (adult)
Important facts
- Normal adult oral temperature: 36.5–37.5°C (average 37.0°C); rectal ~0.5°C higher; axillary ~0.5°C lower.
- Hypothalamus is the body's thermostat; acts to restore temperature to set point.
- Three phases of fever: (1) Onset/Chill — shivering, vasoconstriction, pallor; provide warmth. (2) Plateau — sustained fever, flushed skin, thirst; increase fluids, cooling measures. (3) Defervescence/Crisis — diaphoresis, set point drops; monitor for dehydration.
- Fever patterns: Intermittent (fever then normal), Remittent (fluctuates but stays above normal), Relapsing (fever-free days in between), Constant (persistently elevated).
- Paracetamol (acetaminophen): Adult dose 500 mg–1 g every 4–6 hours; MAX 4 g/day (use lower max in hepatic disease).
- Tepid sponge baths use WARM water (~29–32°C), NOT cold or alcohol — cold causes shivering and vasoconstriction (counterproductive).
- Fever is NOT a disease — it is a symptom of infection, malignancy, or immune response; address underlying cause.
- Older adults and infants may have blunted febrile response — a normal temp does NOT rule out serious infection.
- Monitor for febrile seizures in children (usually 6 months–5 years); risk peaks at T >39°C; ensure airway safety.
- Circadian rhythm: Temperature is lowest in early morning (~6 AM) and highest in late afternoon/evening (~4–6 PM); account for timing when interpreting single readings.
Key definitions
Pyrexia/Fever (Hyperthermia)
Example
Patient with pneumonia presenting with T 38.8°C oral = moderate fever
Elevation of core body temperature above normal set point (>37.5°C oral); protective response to infection or pathology.
Hypothermia
Example
Elderly patient exposed to cold environment, T 33.2°C rectal
Core body temperature <35°C; impaired thermoregulation; medical emergency if <30°C.
Hyperpyrexia
Example
Child with meningitis, T 41.5°C — emergency intervention required
Dangerously high fever, typically >41°C; risk of febrile seizures and delirium.
Diaphoresis
Example
Patient drenched in sweat as fever breaks — provide dry linens and fluids
Profuse sweating; occurs during defervescence (crisis/flush phase) of fever as set point normalizes.
Diagrams to know
- Three phases of fever (Onset → Plateau → Defervescence) with nursing interventions for each
- Temperature conversion nomogram or mental anchor: 37°C = 98.6°F
Pulse Assessment & Cardiac Monitoring
Formulas
Pulse rate count: Regular pulse = count for 30 sec × 2; Irregular pulse = count for 60 sec × 1
Meaning
Counting method to determine beats per minute (bpm)
Watch out
If ANY irregularity is detected, ALWAYS count for 60 seconds — do NOT use the 30-second shortcut.
When to use
Every pulse assessment; irregular rhythms REQUIRE full 60-second count
Pulse deficit = Apical rate − Radial rate
Meaning
Difference indicates weak or ineffective cardiac contractions
Watch out
Two nurses must count simultaneously — apical for 60 sec, radial for 60 sec; any deficit warrants investigation.
When to use
Assess in atrial fibrillation, heart failure, or before giving digoxin
DIGOXIN RULE: Hold if apical pulse <60 bpm (adult); <90–100 bpm (infant per facility protocol)
Meaning
Critical safety parameter for cardiac glycoside administration
Watch out
This is a direct-from-memory NLE question — ALWAYS count apical for 60 sec; if HR <60, HOLD and notify physician immediately.
When to use
Before EVERY digoxin dose; count apical pulse for 1 FULL MINUTE
Common values
Value
60–100 bpm
Symbol
HR
Quantity
Normal adult resting pulse
Value
120–160 bpm
Symbol
HR_neonate
Quantity
Normal newborn heart rate
Value
<60 bpm
Symbol
Critical
Quantity
Digoxin hold threshold (adult apical)
Value
<90–100 bpm (facility-specific)
Symbol
Critical_infant
Quantity
Digoxin hold threshold (infant apical)
Value
5–10 seconds (carotid or brachial)
Symbol
Assessment
Quantity
Cardiac arrest pulse check duration
Important facts
- Normal adult resting heart rate: 60–100 bpm; athletes may be 40–60 bpm.
- Newborn HR: ~120–160 bpm; decreases with age to adult values.
- Assess pulse at RADIAL (wrist) site most commonly; APICAL (listen at 5th ICS, midclavicular line) for accuracy and before cardiac drugs.
- Peripheral pulse sites: temporal, carotid, apical, brachial, radial, femoral, popliteal, posterior tibial, dorsalis pedis.
- NEVER palpate BOTH carotids simultaneously — risk of decreasing cerebral blood flow.
- In cardiac arrest: palpate CAROTID pulse (adults); BRACHIAL pulse (infants) for 5–10 seconds.
- Pulse amplitude grading: 0 (absent), 1+ (weak/thready), 2+ (normal), 3+ (bounding), 4+ (full/strong).
- Assess pulse for RATE, RHYTHM (regular vs irregular), VOLUME (amplitude), and EQUALITY (compare left/right sides).
- Irregular pulses REQUIRE full 60-second count and apical assessment.
- Digoxin toxicity risk: Hold if apical HR <60 bpm; also monitor for nausea, vomiting, arrhythmias, visual disturbances (halo effect).
- Fever increases heart rate ~10 bpm per 1°C elevation.
- Medications: Beta-blockers LOWER HR; epinephrine/sympathomimetics RAISE HR.
Key definitions
Tachycardia
Example
Patient post-surgery with HR 118 bpm, BP dropping — assess for shock
Heart rate >100 bpm in adults; may indicate fever, anxiety, pain, hemorrhage, or cardiac pathology.
Bradycardia
Example
Trained runner with resting HR 52 bpm = normal; bedridden patient with HR 48 bpm on digoxin — assess drug toxicity
Heart rate <60 bpm in adults; seen in athletes, hypothermia, hypothyroidism, or cardiac block.
Pulse Deficit
Example
Apical rate 92, radial rate 78 = pulse deficit of 14 bpm (some beats too weak to palpate peripherally)
Difference between apical (auscultated) and radial (palpated) rates; indicates weak/uncoordinated contractions.
Apical Pulse
Example
Listen at the point of maximal impulse (PMI); count 'lub-dub' as one beat for 60 seconds
Heart rate auscultated directly over the apex of the heart (5th intercostal space, midclavicular line); most accurate; required before digoxin.
Diagrams to know
- Pulse sites on the body (9 peripheral sites plus apical location)
- 5th intercostal space location for apical pulse (PMI anatomy)
- Pulse amplitude grading scale (0–4+)
Respiration Assessment & Oxygen Saturation
Formulas
Respiratory rate count: Regular breathing = count for 30 sec × 2; Irregular = count for 60 sec × 1
Meaning
Number of breaths per minute (breaths/min)
Watch out
Count respirations IMMEDIATELY after taking pulse while keeping fingers on wrist — patient must NOT know you are counting.
When to use
Every respiratory assessment; count DISCREETLY without patient awareness (awareness alters breathing)
Pulse oximetry (SpO₂) interpretation: Normal ≥95%; Hypoxemia <90% = INTERVENTION
Meaning
Percentage of hemoglobin saturated with oxygen
Watch out
In COPD patients with CO₂ retention, target SpO₂ may be 88–92% to preserve hypoxic respiratory drive — do NOT automatically target 95%.
When to use
Continuous monitoring in hospitalized patients; before/after procedures
Common values
Value
12–20 breaths/min
Symbol
RR
Quantity
Normal adult respiratory rate
Value
30–60 breaths/min
Symbol
RR_neonate
Quantity
Normal newborn respiratory rate
Value
95–100%
Symbol
SpO₂
Quantity
Normal SpO₂ (room air, sea level)
Value
<90% SpO₂
Symbol
Critical
Quantity
Hypoxemia threshold
Value
88–92%
Symbol
SpO₂_COPD
Quantity
Target SpO₂ in COPD with CO₂ retention
Value
>20 breaths/min
Symbol
Abnormal
Quantity
Tachypnea threshold (adult)
Value
<12 breaths/min
Symbol
Abnormal
Quantity
Bradypnea threshold (adult)
Important facts
- Normal adult respiratory rate: 12–20 breaths/min; count as one complete inspiratory-expiratory cycle.
- Newborn RR: ~30–60 breaths/min; decreases with age.
- Count respirations DISCREETLY — the moment a patient knows you are counting, breathing becomes voluntarily altered.
- Assess RATE, DEPTH (shallow vs deep), RHYTHM (regular vs irregular), and EFFORT (use of accessory muscles, retractions).
- Normal SpO₂ in healthy adults: 95–100% on room air; <90% = hypoxemia requiring intervention.
- COPD patients with chronic CO₂ retention: target SpO₂ = 88–92% ONLY — do NOT give high-flow O₂ (suppresses hypoxic respiratory drive).
- Breath sounds: Clear bilateral = normal; crackles (rales) = pulmonary edema/pneumonia; wheezes = obstruction/asthma; stridor = upper airway obstruction.
- Fever increases RR ~4 breaths/min per 1°C; pain and anxiety increase RR.
- Abnormal breathing patterns: Apnea (cessation), Tachypnea (>20/min), Bradypnea (<12/min), Cheyne-Stokes (alternating apnea/hyperpnea), Kussmaul (deep, sighing — DKA).
- Pulse oximetry limitations: Affected by poor perfusion, carbon monoxide poisoning, methemoglobinemia, dark skin pigmentation (older machines), and motion artifact.
- SpO₂ <90% is an URGENT finding — immediately assess airway, breathing, circulation; apply oxygen; notify physician.
- In end-of-life care, Cheyne-Stokes is expected and does NOT require emergency intervention.
Key definitions
Tachypnea
Example
Child with asthma exacerbation: RR 38 breaths/min + SpO₂ 88% = emergency
Rapid breathing >20 breaths/min in adults; indicates fever, hypoxia, pain, anxiety, metabolic acidosis.
Bradypnea
Example
Post-operative patient on morphine: RR 8 breaths/min = respiratory depression risk; assess for hypoxemia
Slow breathing <12 breaths/min in adults; indicates CNS depression (opioids, sedatives), respiratory fatigue.
Dyspnea
Example
Patient reports SOB with minimal exertion, SpO₂ 92%, RR 26 — evaluate for cardiac/pulmonary pathology
Subjective sensation of difficult or labored breathing; assess severity on 0–10 scale.
Orthopnea
Example
Heart failure patient: 'I cannot sleep without 3 pillows' = orthopnea → fluid overload
Dyspnea when lying flat; relieved by sitting upright; classic sign of pulmonary edema or heart failure.
Cheyne-Stokes Respiration
Example
Dying patient: 20 seconds of apnea, then 30 seconds of deep rapid breathing, repeat — normal in end-stage disease
Alternating pattern of apnea (no breathing) and hyperpnea (deep, rapid breathing); indicates serious illness, CNS dysfunction, or end of life.
Kussmaul Respiration
Example
Uncontrolled diabetic patient with DKA: RR 32, deep sighing breaths, fruity breath odor (ketones)
Deep, rapid, labored breathing without dyspnea; pathognomonic for metabolic acidosis (especially DKA).
Hypoxemia
Example
Post-operative patient: SpO₂ drops to 87% on room air → provide supplemental O₂, assess positioning
Inadequate oxygen in arterial blood; SpO₂ <90% or PaO₂ <60 mmHg; requires intervention.
Diagrams to know
- Abnormal breathing patterns (visual comparison: Cheyne-Stokes vs Kussmaul vs Normal)
- Respiratory assessment flowchart (Rate → Depth → Rhythm → Effort → SpO₂)
Blood Pressure Assessment & Measurement Accuracy
Formulas
Blood Pressure Interpretation (American College of Cardiology/AHA current guidelines): Normal: SBP <120 AND DBP <80 | Elevated: SBP 120–129 AND DBP <80 | Hypertension Stage 1: SBP 130–139 OR DBP 80–89 | Hypertension Stage 2: SBP ≥140 OR DBP ≥90
Meaning
SBP = Systolic BP; DBP = Diastolic BP (in mmHg)
Watch out
Different organizations (ACC/AHA vs older hypertension guidelines) have different thresholds — know BOTH current and classic definitions for exam.
When to use
Interpret BP readings in clinical context; note: some older references cite ≥140/90 as hypertension — follow exam reference
Pulse Pressure = Systolic BP − Diastolic BP
Meaning
Difference reflects arterial compliance and cardiac function
Watch out
Widened pulse pressure (>50 mmHg) seen in aortic regurgitation, hyperthermia, exercise; narrow pulse pressure (<20 mmHg) in cardiogenic shock, tamponade.
When to use
Calculate to assess vascular elasticity; normal ~30–40 mmHg
Orthostatic Hypotension Criteria: SBP drop ≥20 mmHg OR DBP drop ≥10 mmHg on moving from lying to standing
Meaning
Positional blood pressure changes indicating inadequate cerebrovascular compensation
Watch out
Symptoms (dizziness, syncope) may or may not accompany BP changes — assess both objective BP and subjective symptoms.
When to use
Assess in elderly, post-operative, or volume-depleted patients; obtain readings supine, then 1–3 minutes standing
Mean Arterial Pressure (MAP) = (Systolic + 2×Diastolic) / 3
Meaning
Average pressure throughout cardiac cycle; MAP ≥65 mmHg required for organ perfusion
Watch out
MAP <65 mmHg = inadequate tissue perfusion; indicates shock requiring intervention.
When to use
Clinical settings (ICU); not typically required for NLE but useful concept
Common values
Value
<120/80 mmHg
Symbol
BP_normal
Quantity
Normal adult BP (current guidelines)
Value
SBP 120–129 AND DBP <80 mmHg
Symbol
BP_elevated
Quantity
Elevated BP
Value
SBP 130–139 OR DBP 80–89 mmHg
Symbol
HTN_1
Quantity
Hypertension Stage 1 (current)
Value
SBP ≥140 OR DBP ≥90 mmHg
Symbol
HTN_2
Quantity
Hypertension Stage 2 (current)
Value
≥140/90 mmHg
Symbol
HTN_classic
Quantity
Hypertension threshold (older guideline)
Value
<90 mmHg systolic
Symbol
BP_low
Quantity
Hypotension threshold
Value
≥20 mmHg
Symbol
Orthostatic_SBP
Quantity
Orthostatic hypotension SBP drop
Value
≥10 mmHg
Symbol
Orthostatic_DBP
Quantity
Orthostatic hypotension DBP drop
Value
30–40 mmHg
Symbol
PP_normal
Quantity
Normal pulse pressure
Value
≥65 mmHg
Symbol
MAP_min
Quantity
Minimum MAP for organ perfusion
Value
SBP >180 OR DBP >120 mmHg
Symbol
Emergency
Quantity
Hypertensive urgency/emergency threshold
Important facts
- Normal adult BP: SBP <120 mmHg AND DBP <80 mmHg (newer guidelines); classic cutoff ≥140/90 mmHg for hypertension (older references).
- BP is regulated by: baroreceptors, renin-angiotensin-aldosterone system (RAAS), sympathetic/parasympathetic nervous system, blood volume, and peripheral vascular resistance.
- Measure BP with patient SEATED, back supported, feet flat on floor, arm at HEART LEVEL, rested ≥5 minutes, no talking, no caffeine/smoking 30 min prior.
- CUFF SIZE MATTERS: Too small → falsely HIGH reading; Too large → falsely LOW reading; bladder should encircle 80% of arm.
- DO NOT measure BP on: arm with IV, dialysis fistula, post-mastectomy side, or area of lymphedema.
- Systolic = force during ventricular contraction (top number); Diastolic = force during ventricular relaxation (bottom number).
- Pulse pressure (SBP − DBP) normal ~30–40 mmHg; reflects arterial compliance.
- Orthostatic hypotension: measure supine, then standing after 1–3 minutes; ≥20 mmHg SBP drop or ≥10 mmHg DBP drop = positive finding.
- Palpate systolic first to avoid auscultatory gap error: use radial pulse as reference, inflate 30 mmHg above palpated systolic, then listen.
- Korotkoff sounds: Phase 1 (first sound) = systolic; Phase 2–4 (muffling, softening); Phase 5 (disappearance) = diastolic.
- Common measurement errors: cuff too loose/tight, arm above/below heart, patient not rested, talking during measurement, deflating cuff too quickly.
- Arm positioning: above heart level → falsely LOW BP; below heart level → falsely HIGH BP.
- Systolic >180 mmHg or Diastolic >120 mmHg = Hypertensive urgency/emergency; notify physician immediately.
- Older adults: stiffer arteries → wider pulse pressure and greater orthostatic hypotension risk.
Key definitions
Hypertension
Example
Patient with three BP readings >140/90 over 3 weeks = diagnosed hypertension; start antihypertensive therapy
Persistently elevated blood pressure (Stage 1: ≥130/80 or ≥140/90 depending on guideline; Stage 2: ≥140/90); major cardiovascular risk factor.
Hypotension
Example
Post-operative patient: BP drops from 128/76 to 88/52, lightheaded, pale, diaphoretic = shock; IV fluids/vasopressor needed
Systolic BP <90 mmHg or clinically significant drop from baseline; indicates inadequate perfusion if symptomatic.
Orthostatic (Postural) Hypotension
Example
Elderly patient: lying BP 138/80, standing BP 116/70 = orthostatic hypotension; assist with ambulation, advise slow position changes
Drop in BP on assuming upright position (≥20 mmHg systolic or ≥10 mmHg diastolic); may cause syncope; common in elderly and volume depletion.
Korotkoff Sounds
Example
Inflate to 200 mmHg, release slowly; first sound at 128 mmHg (SBP), last sound at 76 mmHg (DBP) = 128/76
Audible sounds heard via auscultation during BP measurement; first sound = systolic, disappearance = diastolic pressure.
Auscultatory Gap
Example
Palpate radial pulse to estimate systolic first; inflate 30 mmHg above palpated systolic, then auscultate for true SBP
Temporary disappearance of Korotkoff sounds during deflation, risking underestimation of systolic BP; palpate before auscultating.
Diagrams to know
- Proper BP measurement technique and patient positioning
- Cuff size selection chart (bladder encirclement 80% of arm circumference)
- Korotkoff sounds phases (I–V) during deflation
- Hypertension classification flowchart (Normal → Elevated → Stage 1 → Stage 2)
Pain — The Fifth Vital Sign
Formulas
Pain assessment mnemonic: PQRST | P = Provoking/Palliating | Q = Quality | R = Region/Radiation | S = Severity (0–10 scale) | T = Timing/onset
Meaning
Structured approach to comprehensive pain evaluation
Watch out
Do NOT skip severity rating — use numeric 0–10, FACES (children), or FLACC (nonverbal) scale consistently.
When to use
Document ALL dimensions of pain in patient's own words; use for every pain complaint
WHO Analgesic Ladder: Step 1 (Non-opioids: paracetamol, NSAIDs) → Step 2 (Weak opioids: codeine, tramadol) → Step 3 (Strong opioids: morphine, fentanyl) + Adjuvants at each step
Meaning
Escalating pain management strategy based on pain severity
Watch out
Start at appropriate step based on pain severity; do NOT skip steps; add adjuvants (antidepressants, anticonvulsants) for neuropathic pain or to reduce opioid dose.
When to use
Titrate analgesics from non-opioid to opioid based on pain severity and patient response
Common values
Value
0
Symbol
NPS
Quantity
Numeric pain severity: No pain
Value
1–3
Symbol
NPS
Quantity
Numeric pain severity: Mild
Value
4–6
Symbol
NPS
Quantity
Numeric pain severity: Moderate
Value
7–9
Symbol
NPS
Quantity
Numeric pain severity: Severe
Value
10
Symbol
NPS
Quantity
Numeric pain severity: Worst pain imaginable
Value
500 mg–1 g
Symbol
Acetaminophen_dose
Quantity
Paracetamol single dose
Value
4 g/day
Symbol
Acetaminophen_max
Quantity
Paracetamol maximum daily dose
Value
<12 breaths/min
Symbol
Critical_RR
Quantity
Opioid-induced respiratory depression threshold
Value
0.4–0.8 mg IV/IM
Symbol
Naloxone
Quantity
Naloxone adult dose
Important facts
- Pain is subjective — ALWAYS believe the patient's report; do NOT minimize or question pain severity.
- Pain assessment tools: Numeric Rating Scale 0–10 (adults), FACES (children 3–8 years), FLACC (nonverbal infants/patients with cognitive impairment), Wong-Baker.
- Reassess pain 30–60 minutes after analgesic administration — document effectiveness and need for dose escalation.
- Paracetamol (acetaminophen): Adult 500 mg–1 g every 4–6 hours, MAX 4 g/day; contraindicated in severe hepatic disease; toxicity → liver necrosis.
- NSAIDs (ibuprofen, naproxen, ketorolac): Anti-inflammatory, analgesic; risk: GI ulceration, renal dysfunction, bleeding — contraindicated in renal failure, active GI bleeding, severe cardiovascular disease.
- Opioids: Morphine, fentanyl, codeine, tramadol; most effective for moderate-severe pain; respiratory depression = #1 serious adverse effect → monitor RR; naloxone is opioid antagonist/reversal agent.
- Opioid-induced respiratory depression: Monitor RR <12/min = urgent; administer naloxone 0.4–0.8 mg IV/IM; repeat every 2–3 minutes if needed.
- Non-pharmacologic pain management: Positioning, heat/cold therapy, massage, TENS, guided imagery, relaxation, distraction, music therapy, cognitive-behavioral techniques.
- Combination therapy: Pharmacologic + non-pharmacologic often more effective and allows lower analgesic doses.
- Adjuvant medications for neuropathic pain: Gabapentin, pregabalin, amitriptyline, duloxetine, carbamazepine.
- Pain-related NANDA diagnoses: Acute Pain, Chronic Pain; related to surgery, trauma, disease, inflammation, neuropathy.
- Nursing interventions: Assess pain PQRST systematically; administer analgesics promptly (do NOT undertreat); position for comfort; provide environmental comfort (quiet, cool); use therapeutic touch and distraction.
Key definitions
Pain (Definition per International Association for the Study of Pain)
Example
Patient with no visible injury but reports 8/10 pain = BELIEVE and TREAT; pain is real to the patient
Subjective sensory and emotional experience associated with actual or potential tissue damage; whatever the patient says it is, existing when the patient says it exists.
Acute Pain
Example
Post-operative pain, acute myocardial infarction, trauma — resolves with healing
Protective, short-duration pain (minutes to <6 weeks) with identifiable cause; often has autonomic signs (↑HR, ↑BP, diaphoresis, anxiety).
Chronic Pain
Example
Chronic low back pain, fibromyalgia, cancer pain — different management approach than acute pain
Persistent pain lasting >3–6 months beyond normal healing; lacks protective function; often accompanied by depression, sleep disturbance, decreased activity.
Nociceptive Pain
Example
Post-surgical incision pain (somatic), pancreatitis (visceral)
Pain from tissue damage (somatic: musculoskeletal, integument; visceral: organs); responds well to NSAIDs and opioids.
Neuropathic Pain
Example
Diabetic neuropathy, post-herpetic neuralgia, phantom limb pain — NSAIDs/opioids alone often ineffective
Pain from nerve injury or dysfunction (not caused by nociceptor activation); described as burning, tingling, 'electric'; requires adjuvants (gabapentin, pregabalin, amitriptyline).
Diagrams to know
- WHO Analgesic Ladder (3-step escalation with examples)
- PQRST pain assessment framework
- Pain severity scales comparison (0–10, FACES, FLACC)
Vital Signs in Special Populations & Documentation
Common values
Value
120–160 bpm
Symbol
HR_neonate
Quantity
Newborn heart rate
Value
30–60 breaths/min
Symbol
RR_neonate
Quantity
Newborn respiratory rate
Value
100–160 bpm
Symbol
HR_infant
Quantity
Infant (6 months) heart rate
Value
90–150 bpm
Symbol
HR_toddler
Quantity
Toddler (1–3 years) heart rate
Value
80–120 bpm
Symbol
HR_preschooler
Quantity
Preschooler (3–6 years) heart rate
Value
70–110 bpm
Symbol
HR_schoolage
Quantity
School-age (6–12 years) heart rate
Value
>37.2°C oral or any elevation above baseline
Symbol
Elderly_fever
Quantity
Fever threshold in older adults (increased risk)
Important facts
- Infants and children: Assess respirations and APICAL pulse FIRST before disturbing child (distress elevates all vital signs); count for FULL MINUTE.
- Newborn HR: 120–160 bpm; increases with crying/feeding; baseline must be measured at rest.
- Newborn RR: 30–60 breaths/min; count for 60 seconds; normal to have brief apneic pauses <10 seconds.
- Pediatric BP: Lower than adults; varies by age and height; use pediatric cuff appropriately sized.
- Older adults: Stiffer arteries → wider pulse pressure; increased risk of orthostatic hypotension; blunted febrile response to infection.
- Older adults temperature: May not mount typical fever response (no temp >38°C) even with serious infection → look for subtle signs: confusion, weakness, incontinence.
- Chronic illness: Compare current vital signs to patient's OWN BASELINE, not population norms — an HR of 50 is normal for an athlete but concerning for a previously healthy adult.
- Document vital signs with ROUTE/SITE: 'T 38.2°C oral,' 'HR 92 apical,' 'BP 142/88 right arm, sitting,' 'SpO₂ 96% RA (room air)'.
- Record date, time, and CONTEXT (before/after medication, activity, or procedure).
- Plot values on graphic chart to show TRENDS — rising HR + RR with falling BP and SpO₂ = early warning of deterioration; escalate immediately.
Key definitions
Pediatric vital signs (general pattern)
Example
Neonate HR 140 bpm, RR 40/min, BP 65/40; 8-year-old HR 90 bpm, RR 20/min, BP 105/60
Heart rate, respiratory rate, and blood pressure decrease with age toward adult values; infants have highest rates, older children approach adult norms by puberty.
Fever assessment in older adults
Example
Elderly nursing home resident with 'normal' oral temp 37.1°C but altered mental status, confusion → assume infection; culture and treat empirically until ruled out
Older adults often have blunted febrile response; a 'normal' temperature may mask serious infection; oral temp >37.2°C or any temp elevation above baseline warrants investigation.
Diagrams to know
- Pediatric vital signs by age (table format: age groups with expected HR, RR, BP ranges)
- Documentation format example with correct terminology
Must remember
- ADULT VITAL SIGN NORMALS: Temperature (oral) 36.5–37.5°C; Pulse 60–100 bpm; Respiration 12–20 breaths/min; BP <120/<80 mmHg; SpO₂ 95–100% — these are the absolute baseline you MUST know for every NLE question.
- TEMPERATURE CONVERSION ANCHOR: 37°C = 98.6°F; remember this one conversion to derive others using the formula °F = (°C × 9/5) + 32.
- RECTAL ≈ +0.5°C; AXILLARY ≈ −0.5°C COMPARED TO ORAL — this is heavily tested; know that rectal is most accurate, axillary is safest.
- APICAL PULSE + DIGOXIN RULE: ALWAYS count apical pulse for 1 FULL MINUTE before administering digoxin; HOLD if <60 bpm (adult) and notify physician immediately — this is a direct safety rule tested on the NLE.
- IRREGULAR PULSE = 60-SECOND COUNT: Never use the 30-second shortcut for irregular rhythms; you MUST count the full minute and consider apical assessment for accuracy.
- SpO₂ <90% = HYPOXEMIA = INTERVENTION: Immediately assess airway, provide oxygen, and notify physician — this is an urgent clinical finding. Exception: COPD patients may target 88–92% to preserve hypoxic respiratory drive.
- ORTHOSTATIC HYPOTENSION CRITERIA: SBP drop ≥20 mmHg OR DBP drop ≥10 mmHg when moving from lying to standing; measure supine then standing after 1–3 minutes; high fall risk in elderly.
- CUFF SIZE RULE: Too small = falsely HIGH BP; Too large = falsely LOW BP — this is a guaranteed NLE question; know proper sizing (bladder encircles 80% of arm).
- PAIN IS THE FIFTH VITAL SIGN AND IS SUBJECTIVE: Whatever the patient says it is, existing when the patient says it exists — BELIEVE and TREAT pain; use 0–10 scale (adults), FACES (children 3–8), FLACC (nonverbal).
- PARACETAMOL MAX DOSE: 4 g/day in adults (lower in hepatic disease); administered 500 mg–1 g every 4–6 hours — opioid-induced respiratory depression antidote is naloxone 0.4–0.8 mg IV/IM.
Last minute tips
- FEVER PHASES MATTER: The NLE will ask about nursing interventions for each phase (Onset = provide warmth; Plateau = increase fluids + cooling measures; Defervescence = monitor for dehydration). Know these cold.
- AUSCULTATORY GAP TRAP: If an NLE question mentions 'sounds disappear then reappear,' it's asking about auscultatory gap — ALWAYS palpate systolic first, inflate 30 mmHg above palpated systolic, then listen to avoid underestimating systolic BP.
- KUSSMAUL = ACIDOSIS (especially DKA): Deep, rapid, SIGHING breathing without dyspnea sensation in a patient with altered glucose or ABG = call this pattern by name; it's a guaranteed recognition question.
- CHEYNE-STOKES IN END-OF-LIFE: If the NLE presents a patient in palliative care with Cheyne-Stokes respiration, the correct answer is NOT to intervene with emergency measures — it's NORMAL and expected at end of life; reassure family.
- OLDER ADULTS + BLUNTED FEVER: An elderly nursing home resident with a 'normal' temperature (37.1°C) but acute confusion or weakness = assume infection (UTI, pneumonia) and treat empirically until ruled out; do NOT be reassured by the normal-looking temperature number.
Comparison tables
Temperature Routes — Comparison of Accuracy, Safety & Timing
| Route | Temperature Range (°C) | Advantages | Disadvantages | Timing (minutes) |
|---|---|---|---|---|
| Oral | 36.5–37.5°C (baseline) | Non-invasive, convenient, comfortable, patient cooperative | Contraindicated: altered LOC, oral surgery, chemotherapy mouth ulcers, NPO, seizure risk | 3–5 |
| Rectal | 37.5–38.0°C (~0.5°C higher) | Most accurate core temperature, preferred in infants/children | Invasive, embarrassing, contraindicated: rectal surgery/trauma, diarrhea, immunocompromised, prematurity (perforation risk) | 2–3 |
| Axillary | 36.0–36.5°C (~0.5°C lower) | Safest, non-invasive, preferred in newborns and unconscious patients | Least accurate, affected by ambient temperature, requires 5–10 minute contact | 5–10 |
| Tympanic/Temporal | ~Core temp (37.0–37.5°C) | Rapid, non-invasive, approximates core temp, good for screening | Affected by cerumen impaction, incorrect probe angle, environmental temperature, variable accuracy | 1–2 |
Fever Patterns — Clinical Recognition & Nursing Response
| Pattern | Definition & Graph Appearance | Clinical Examples | Nursing Interventions |
|---|---|---|---|
| Intermittent | Temperature alternates between fever and normal; spikes in morning/evening | Tuberculosis, lymphoma, some bacterial infections | Monitor for diaphoresis during crisis; provide warm covers during chill phase; monitor fluid intake/output |
| Remittent | Temperature fluctuates but stays above normal throughout day; never reaches baseline | Acute bacterial infection (pneumonia, abscess), sepsis | Continuous cooling measures; increased fluids; antipyretics as ordered; monitor for septic shock signs |
| Relapsing (Tertian) | Alternating febrile and afebrile days; fever-free period between 1–2 days | Malaria, rat-bite fever, leptospirosis | Educate patient about expected pattern; prevent dehydration during afebrile days; monitor for complications |
| Constant/Sustained | Temperature remains persistently elevated with minimal daily variation (<0.5°C) | Typhoid fever, meningitis, acute streptococcal pharyngitis | Aggressive cooling measures; frequent monitoring; prepare for potential complications (seizures, delirium); antipyretics as ordered |
Abnormal Respiration Patterns — Recognition & Associated Conditions
| Pattern | Description & Rate | Associated Conditions | Nursing Action |
|---|---|---|---|
| Tachypnea | Rapid breathing, >20 breaths/min (adult) | Fever (+4 breaths/°C), hypoxia, pain, anxiety, acidosis, pulmonary embolism, asthma, pneumonia | Assess SpO₂, oxygenation; position upright; provide O₂ if SpO₂ <90%; calm and reassure patient |
| Bradypnea | Slow breathing, <12 breaths/min (adult) | Opioid overdose, CNS depression, anesthesia, increased intracranial pressure, hypothermia, metabolic alkalosis | URGENT: Assess level of consciousness, airway patency; prepare for naloxone if opioid-induced; check SpO₂; notify physician immediately |
| Cheyne-Stokes | Alternating apnea (10–20 sec) then hyperpnea; crescendo-decrescendo pattern | Heart failure, stroke, CNS injury, dying patient (normal in end-of-life care), severe hypoxia | In acute setting: assess for shock, heart failure; arrange ICU monitoring. In palliative care: reassure family, do NOT intervene; expected finding |
| Kussmaul | Deep, rapid, sighing breaths (may be >20/min); no dyspnea sensation | Metabolic acidosis (DKA, uremia, lactic acidosis), sepsis, salicylate toxicity | URGENT: Check blood glucose, ABG, serum ketones; prepare for IV fluids, insulin; notify physician; monitor closely for respiratory failure |
| Apnea | Cessation of breathing; >10 sec constitutes clinically significant apnea | Cardiac arrest, airway obstruction, medication overdose, CNS disorder, sleep apnea | If cardiac arrest: initiate CPR, call code. If awake: assess airway, respiratory effort, oxygenation; prepare for intubation if needed |
Blood Pressure Measurement Errors — Common Mistakes & Correction
| Error Type | Effect on Reading | Cause/Example | Correction |
|---|---|---|---|
| Cuff too small | Falsely HIGH systolic and diastolic | Cuff bladder <80% arm circumference; using pediatric cuff on obese adult | Select cuff appropriate for arm circumference; obese arm may need large/thigh cuff |
| Cuff too large | Falsely LOW systolic and diastolic | Cuff bladder >80% arm circumference; using adult cuff on thin child | Right-size cuff; measure arm circumference if unsure |
| Arm above heart level | Falsely LOW reading | Measuring with arm elevated on pillow above cardiac level | Place arm at heart level (4th intercostal space, midaxillary line); support arm at same level as heart |
| Arm below heart level | Falsely HIGH reading | Measuring while arm hangs at side below cardiac level | Support arm at heart level; sitting position with feet flat, back supported, arm at 90 degrees |
| Cuff too loose/too tight | Loose: HIGH reading; Tight: LOW reading | Not snug against skin; improper application | Cuff should fit snugly with 1 finger space between cuff and arm; inflate smoothly |
| Patient talking/anxious | Falsely HIGH reading (white coat effect) | Conversation, stress, full bladder, physical discomfort | Quiet environment, rest 5 minutes before measurement, empty bladder, reassure patient |
| Deflating cuff too quickly | Falsely LOW diastolic; miss auscultatory gap | Deflating >2 mmHg/second | Deflate cuff slowly (~2 mmHg/second); do NOT rush; listen carefully throughout |
| Auscultatory gap (not recognized) | Underestimation of systolic pressure | Korotkoff sounds disappear then reappear during deflation; not palpating first | Always palpate systolic first using radial pulse; inflate 30 mmHg above palpated systolic; then auscultate |
Pain Assessment Scales — Appropriate Use by Age/Cognition
| Scale Name | Age/Population | How to Use | Advantages | Limitations |
|---|---|---|---|---|
| Numeric Rating Scale (0–10) | Cooperative adults and children >8 years | Ask: 'On a scale of 0 to 10, where 0 is no pain and 10 is the worst pain imaginable, how much pain are you having?' | Quick, reliable, quantifiable, allows trends, verbal expression | Requires patient cooperation and cognitive ability; not suitable for nonverbal/very young |
| Wong-Baker FACES Scale | Children 3–8 years, older adults with dementia, non-English speakers | Show pictures of faces (smiling to crying) with number ratings; ask child to point to face matching their pain | Visual, non-verbal, culturally accepted, validated in pediatrics, simple | May not correlate with NPS in older children; interpretation varies; requires picture availability |
| FLACC Scale (Face, Legs, Activity, Cry, Consolability) | Nonverbal infants and children 2 months–7 years; cognitively impaired adults | Observe 5 behavioral indicators, score 0–2 each; total 0–10 score = pain intensity | Objective behavioral assessment, validated, no verbal ability needed, useful for sedated/intubated patients | Requires trained observer, time-consuming, may be affected by pain medication, sedation, developmental stage |
| CRIES Scale (Crying, Requires O₂, Increased vital signs, Expression, Sleeplessness) | Post-operative neonates and infants <2 years | Score 5 parameters (0–2 each); total 0–10 = post-op pain level | Specific for post-operative pain in neonates, validated, includes vital signs component | Limited to post-op setting, neonatal population only; time-intensive; requires vital sign data |
Diagrams
Vital Signs Assessment & Documentation Flowchart
Comprehensive flowchart guiding systematic vital signs assessment from collection through documentation and clinical decision-making. Shows decision points for abnormal findings and triggers for escalation.
Vital Signs Concept Map — Relationships & Key Points
Hierarchical mind map showing how all vital signs components relate to each other and the key decision points, normal values, and management strategies for each vital sign type.
Fever Phases & Clinical Progression
State diagram showing the three clinical phases of fever progression (Onset/Chill → Plateau/Course → Defervescence/Crisis), characteristic signs in each phase, and corresponding nursing interventions for exam preparation.
Temperature Conversion Quick Reference
Timeline showing key temperature milestones in both Celsius with their clinical significance, providing quick reference for temperature interpretation during exam.
Blood Pressure Measurement — Proper Technique Decision Tree
Detailed decision tree guiding proper BP measurement technique from patient positioning through documentation, highlighting common errors (cuff size, arm position) and how to avoid them.