Management of Facial Palsy in a 38-Year-Old Female

Step 1: Initial Assessment and Cause Identification

• Onset: Sudden (Bell's palsy, Ramsay Hunt) vs. progressive (tumor - must be imaged)
• Completeness: Partial vs. complete paralysis
• Associated features:
  • Vesicles on pinna/ear canal/oropharynx → Ramsay Hunt syndrome (VZV)
  • Ear discharge, chronic otitis media → otogenic cause
  • Tick exposure, rash → Lyme disease (Borrelia burgdorferi)
  • Bilateral palsy → metabolic, autoimmune, infectious (Lyme), sarcoid
  • Parotid mass → parotid tumor
  • Recent viral illness, periauricular pain → Bell's palsy (HSV-1 reactivation)
• Grading: Use the House-Brackmann grading scale (I = normal, VI = complete palsy)

At 38 years, a female is at peak incidence age for Bell's palsy (peak 15-45 years). In pregnancy, Bell's palsy is more common (especially 3rd trimester), though this patient's pregnancy status is not specified.

1. Paralysis or paresis of all muscle groups on one side of the face
2. Sudden onset
3. Absence of signs of CNS disease
4. Absence of signs of ear or CPA disease

Step 2: Investigations

• Indicated only in complete paralysis failing to improve
• Electroneurography (ENoG): perform ~10 days post onset
• If CAP decline does NOT reach 90% → excellent prognosis without surgery
• If 90% degeneration on ENoG + absent voluntary motor potentials on EMG → consider surgical decompression
• 67% of patients who reach 90% degeneration still achieve excellent outcomes

Step 3: Medical Management

A. Corticosteroids (FIRST-LINE - Most Evidence)

• Must start within 72 hours of onset for maximum benefit
• Evidence: Scottish Bell's Palsy Study showed clear benefit with prednisolone within 72 h
• A multi-institutional trial of 829 patients showed higher recovery rates and less synkinesis when steroids started within 48 hours
• Meta-analysis shows 17% better chance of complete recovery vs. untreated patients

If presenting late (>72 h but within 1 week), steroids can still be offered, though benefit is less established.

B. Antiviral Therapy (Adjunctive)

• Evidence is mixed: Cummings notes AAN 2012 found antivirals add <7% additional benefit over steroids alone
• Scott-Brown's notes the most recent Cochrane evidence supports combination therapy for reducing incomplete recovery and long-term sequelae (synkinesis, excessive tearing)
• Most ENT surgeons advocate combination therapy (steroid + antiviral)
• Particularly important if Ramsay Hunt syndrome is suspected - here antivirals are mandatory and strongly beneficial

• Prednisolone 1 mg/kg/day × 10 days
• Acyclovir 400 mg 5× daily × 10 days (or Valacyclovir 1g TDS × 7 days)

Step 4: Eye Care (URGENT - Do Not Neglect)

Over time, unopposed levator palpebrae superioris (CN III) causes upper lid shortening - patients must be taught lid-stretching exercises from the outset.

Step 5: Physical Therapy and Rehabilitation

• Facial physiotherapy/neuromuscular retraining is strongly supported
• Techniques include: biofeedback, EMG-guided exercises, mirror therapy, self-directed exercises
• Timing: Start as soon as possible and continue throughout recovery
• Particularly important for patients at risk of or with synkinesis (involuntary co-movements)
• Goal: maintain muscle tone, promote recovery, minimize synkinesis and contracture

Step 6: Surgical Management

1. Complete facial paralysis confirmed
2. ENoG showing ≥90% degeneration within 14 days of onset
3. No voluntary motor potentials on EMG

Note: Surgical decompression in Bell's palsy is NOT standard practice. Most surgeons do NOT recommend it routinely. The evidence base is limited by small trial sizes. For traumatic facial palsy, surgical indications are different.

Step 7: Management of Sequelae

Step 8: Cause-Specific Additions

Prognosis of Bell's Palsy

• 80-90% recover completely overall
• Incomplete paralysis at presentation: 95-100% full recovery
• Complete paralysis: recovery expected in ~3 months in two-thirds of patients
• No further recovery expected after 6 months
• Poor prognostic factors: complete paralysis at onset, old age, dry eye, absent taste, absent stapedius reflex, postauricular pain, diabetes mellitus, hypertension, age >60

Summary: Management Checklist

1. Confirm Bell's palsy (exclude other causes; progressive palsy → urgent MRI)
2. Start prednisolone 1 mg/kg/day within 72 hours
3. Add acyclovir/valacyclovir (combination therapy preferred by most ENT surgeons)
4. Protect the eye - artificial tears, ointment, taping, lid weight if needed
5. Refer to physiotherapy for facial neuromuscular retraining
6. Baseline bloods: glucose, BP, FBC
7. ENoG only if complete palsy - at 14 days post onset
8. Ophthalmology review if eye at risk
9. Review at 3-4 weeks: assess recovery; adjust plan
10. Long-term: manage synkinesis, consider reanimation if no recovery by 6 months

Clinical Assessment and Management

Presenting Triad Analysis

Step 1: Determine the Cause

• Alcoholic liver disease (most common globally)
• Viral hepatitis B or C (chronic)
• Non-alcoholic fatty liver disease (NAFLD/NASH)
• Autoimmune hepatitis
• Wilson's disease (younger patients)
• Hemochromatosis
• Budd-Chiari syndrome
• Malignancy (hepatocellular carcinoma, metastatic disease)
• Cardiac cirrhosis (right heart failure)

Step 2: Investigations

Immediate/Urgent

• Total bilirubin, direct/indirect bilirubin (characterize jaundice)
• AST, ALT, ALP, GGT
• Serum albumin (key marker of synthetic function)
• Prothrombin time / INR (coagulation - synthetic function)

• Thrombocytopenia (hypersplenism in portal hypertension)
• Anemia (multifactorial)

• Serum creatinine, urea, eGFR (hepatorenal syndrome risk)
• Serum sodium (dilutional hyponatremia)
• Serum potassium (critical before starting diuretics)

• Cell count + differential (neutrophils >250/mm³ = SBP)
• Culture and sensitivity (inoculate blood culture bottles at bedside)
• Serum-Ascites Albumin Gradient (SAAG): SAAG ≥1.1 g/dL confirms portal hypertension as cause
• Total protein (protein <1 g/dL = high SBP risk)
• Cytology if malignancy suspected
• LDH, glucose, amylase if secondary peritonitis suspected

• Child-Pugh score (A/B/C classification)
• MELD score (Model for End-stage Liver Disease) - guides transplant listing

Additional Workup (Etiology-Directed)

• Ultrasound abdomen with Doppler - first line: assess liver echogenicity, splenomegaly, portal vein diameter, direction of flow, ascites volume, hepatic vein patency (Budd-Chiari), HCC screening
• Upper GI endoscopy - assess for oesophageal/gastric varices (risk of bleeding)
• CT or MRI abdomen if malignancy or Budd-Chiari suspected

Step 3: Management of Ascites

Grade 2 (Moderate) Ascites

• Limit dietary sodium to 80-120 mEq/day (~4.6-6.9 g salt/day = "no-added salt" diet
• Avoid preprepared meals
• Do NOT restrict fluid unless hyponatremia (Na <125 mEq/L) is present

• Start Spironolactone 100 mg/day orally
• Increase stepwise every 72 hours (not sooner - slow onset of action) according to response
• Maximum dose: 400 mg/day
• If no response or hyperkalemia develops, add Furosemide 40 mg/day, increasing stepwise to maximum 160 mg/day
• Always use furosemide in combination with spironolactone, never alone in cirrhosis

• Start combination therapy (spironolactone + furosemide) from the outset

• 0.5 kg/day in patients without peripheral edema
• 0.5-1.0 kg/day in patients with ascites AND edema

• Daily weight
• Serum electrolytes, creatinine, urea every 1-2 weeks initially
• Watch for: hyponatremia, hyperkalemia, renal impairment, hepatic encephalopathy (all are complications/reasons to reduce/stop diuretics)

Grade 3 (Large/Tense) Ascites

• Safe even with INR >1.5 or platelets <50,000/mm³ (coagulopathy is NOT a contraindication unless DIC or skin infection at puncture site)
• Do NOT give fresh frozen plasma or platelets prophylactically before LVP

• Administer 20% human albumin IV: 6-8 g per litre of ascites removed
• Prevents post-paracentesis circulatory dysfunction (PPCD) - which carries risk of HRS, hyponatremia, and death
• If <5 L removed, risk of PPCD is low; other plasma expanders acceptable

Refractory Ascites

• Sodium restriction (<80 mEq/day) AND
• Maximum diuretics (spironolactone 400 mg/day + furosemide 160 mg/day) for at least 1 week

1. Repeated LVP + albumin (every 2-4 weeks as needed)
2. TIPS (Transjugular Intrahepatic Portosystemic Shunt) - consider if:
   • No severe hepatic encephalopathy (>grade 2)
   • Bilirubin <3 mg/dL (relative contraindication if higher)
   • Platelet count >75,000/mm³
   • No active infection
   • No severe cardiac dysfunction or pulmonary hypertension
   • Improves 1-year transplant-free survival vs. repeated LVP
3. Liver transplantation - definitive treatment; refer early

Step 4: Management of Spontaneous Bacterial Peritonitis (SBP)

• Cefotaxime 2g IV every 8 hours for 5 days (first-line)
• Alternatives: Ceftriaxone, Amoxicillin-clavulanate
• Give Albumin IV: 1.5 g/kg on day 1, then 1 g/kg on day 3 - reduces HRS risk and mortality

• Norfloxacin 400 mg/day orally (indefinite)
• Or Ciprofloxacin 500 mg/day
• Also give prophylaxis in patients with ascitic protein <1.5 g/dL + renal impairment or Child-Pugh C

Step 5: Management of Jaundice

• Vitamin K 10 mg IM/IV for 3 days (if cholestatic component - improves PT/INR if deficiency contributing)
• Ursodeoxycholic acid (cholestatic liver disease/PBC)
• Avoid hepatotoxic drugs (paracetamol at therapeutic dose is acceptable; avoid NSAIDs, aminoglycosides)
• Cholestyramine for pruritus if cholestatic jaundice

Step 6: Management of Hepatic Encephalopathy (if present/when it develops)

• GI bleeding
• Infection (including SBP)
• Electrolyte disturbance (hyponatremia, hypokalemia)
• Constipation
• High-protein diet
• Medications (opioids, benzodiazepines, sedatives)
• Diuretic-induced azotemia

• Grade I: Sleep reversal, mild confusion, asterixis
• Grade II: Lethargy, disorientation, asterixis
• Grade III: Somnolence, severe confusion, asterixis
• Grade IV: Coma

• 15-45 mL orally 2-4 times daily
• Acute phase: 30 mL every 1-2 hours until bowel movement begins, then taper
• Target: 3-5 soft stools per day
• Lactulose enema (300 mL lactulose + 700 mL water) if unable to take orally

• 550 mg orally twice daily
• Add if inadequate response to lactulose alone
• Reduces risk of recurrent hepatic encephalopathy
• Can be used for secondary prevention

Step 7: General and Supportive Measures

• Do NOT restrict protein (old teaching - now shown harmful)
• Target: 1.2-1.5 g protein/kg/day (vegetable/dairy protein preferred - less ammoniagenic)
• 35-40 kcal/kg/day total calories
• Branched-chain amino acid (BCAA) supplements if intolerant of standard protein
• Vitamin supplementation: thiamine, folate, fat-soluble vitamins (A, D, E, K) if malnourished/alcohol-related
• Zinc supplementation (co-factor for urea cycle enzymes; often deficient)
• Avoid prolonged fasting - eat a late-night snack (reduces overnight protein catabolism)

• Upper GI endoscopy to assess varices
• Primary prophylaxis if varices present: Non-selective beta-blockers (propranolol 20-40 mg BD or carvedilol 6.25-12.5 mg/day) OR endoscopic band ligation (EBL)
• Avoid NSAIDs (GI bleeding risk)

• No NSAIDs (worsen renal function markedly in cirrhosis)
• No aminoglycoside antibiotics
• Use contrast media with caution; ensure adequate hydration

• Complete alcohol abstinence
• Salt restriction
• Regular outpatient monitoring

Step 8: Hepatorenal Syndrome (HRS) - Watch For

• Terlipressin 0.5-1 mg IV every 4-6 hours (titrate to creatinine response) + Albumin 20-40 g/day
• Alternative: Noradrenaline infusion + albumin (in ICU setting)
• Bridge to liver transplantation

Step 9: Liver Transplantation (Definitive)

• MELD score ≥15 (or ≥12 with refractory ascites)
• Child-Pugh C cirrhosis
• First episode of SBP, HRS, or hepatic encephalopathy
• Refractory ascites

Summary Management Checklist

1. Diagnostic paracentesis - SAAG, cell count, culture (do immediately)
2. Viral hepatitis serology, LFTs, CBC, RFT, coagulation, albumin, MELD/Child-Pugh
3. Ultrasound abdomen + Doppler + upper GI endoscopy
4. Sodium restriction (80-120 mEq/day)
5. Spironolactone ± furosemide (titrate to daily weight loss target)
6. LVP + albumin if tense/grade 3 ascites
7. Treat underlying cause (alcohol abstinence, antivirals, immunosuppression, etc.)
8. Vitamin K IV if coagulopathy has cholestatic component
9. Lactulose ± rifaximin if encephalopathy present
10. Variceal prophylaxis (beta-blockers or EBL)
11. SBP prophylaxis (norfloxacin/ciprofloxacin if indicated)
12. Refer for liver transplant assessment early

Clinical Assessment and Management

Immediate Clinical Reasoning

• Trigger: Loss of consciousness specifically during/around urination (micturition)
• Age and sex: Adolescent male (peak demographic)
• Duration: ~2 minutes of unconsciousness (consistent with reflex syncope)
• Complete recovery: Now fully conscious, oriented to time/place/person
• Fever context: Recent illness with fever + cold - fever is a known precipitating/potentiating factor for micturition syncope
• Afebrile now: Suggests the febrile illness was the "tipping factor" that lowered the threshold

"The syncopal propensity may increase with fever. Micturition syncope most commonly occurs in men during or after micturition, usually after arising from bed in the erect position. The syncope may result from sudden reflex peripheral vasodilation caused by the release of intravesicular pressure and bradycardia."

• Bradley and Daroff's Neurology in Clinical Practice

Pathophysiology of Micturition Syncope

1. Standing upright (especially from lying/sitting) → venous pooling in lower limbs → decreased venous return → decreased cardiac preload
2. Full bladder + straining → Valsalva-like rise in intravesicular pressure
3. Sudden voiding → abrupt release of that pressure → triggers a sudden reflex peripheral vasodilation (vasodepressor) + vagally mediated bradycardia (cardioinhibitory)
4. Result: Combined fall in cardiac output + peripheral vascular resistance → cerebral hypoperfusion → syncope
5. Fever/dehydration (from his viral illness) → pre-existing volume depletion + peripheral vasodilation from fever → lowers the threshold significantly for this reflex to produce syncope

Differential Diagnosis (Must Not Miss)

History to Obtain (Focused)

• Was the patient standing to urinate (or had just woken up from sleep)?
• Any warning signs before (lightheadedness, sweating, nausea, pallor, dimming of vision)?
• Was the patient straining/had a full bladder?
• Any jerking movements (clonic activity), tongue biting, urinary incontinence, or postictal confusion? (suggests seizure)
• How exactly did recovery occur - immediate? Gradual?
• Was there any palpitation or "racing heart" just before? (suggests arrhythmia)

• Duration and severity of fever
• Oral fluid intake during illness (assess hydration status)
• Medications taken (antipyretics, decongestants)

• Any previous episodes of fainting
• Any known heart disease, murmurs heard before
• Exercise tolerance - any syncope or near-syncope with exercise?
• Any hearing problems from birth (congenital deafness + Long QT = Jervell-Lange-Nielsen syndrome)

• Sudden unexplained death in young family members
• Known cardiac conditions
• History of fainting in siblings/parents

Physical Examination

Investigations

Mandatory (All Patients with First Syncope in Adolescent)

Further Investigations Based on Clinical Suspicion

The history and physical examination are the most important components of initial evaluation. If the history strongly points to reflex/situational syncope AND the ECG is normal AND there are no cardiac red flags - further investigation adds little.

• Bradley and Daroff's Neurology in Clinical Practice, p. 33

Immediate Management in Casualty

1. Stabilization (Already Stable)

• Patient is conscious, oriented, afebrile - no acute resuscitation needed
• Establish IV access (optional given current stability)
• Continuous cardiac monitoring while in casualty
• Pulse oximetry

2. Correct Precipitating Factors

• Rehydration: Given febrile illness with likely reduced oral intake - oral or IV fluids
  • If stable and tolerating orally: oral rehydration / encourage fluids
  • If dehydrated on exam: IV Normal Saline bolus (10-20 mL/kg)
• Continue treatment of underlying viral illness: antipyretics (paracetamol 15 mg/kg/dose = ~645 mg = 650 mg), supportive care

3. Do the ECG NOW

• Interpret carefully for:
  • QTc interval (normal male <450 ms)
  • Delta waves (WPW)
  • Epsilon waves (ARVC)
  • ST elevation V1-V2 (Brugada pattern)
  • LVH pattern (HCM)
  • Conduction abnormalities

4. Bedside Blood Glucose

• Quick, non-invasive - rule out hypoglycemia immediately

Disposition Decision

Management Plan (Outpatient - If Discharged)

Non-Pharmacological (First-Line)

• Explain to patient and father: this is a known, benign, well-recognized reflex condition
• Excellent prognosis - single episodes with a clear trigger rarely recur
• Recovery is always complete and rapid
• Not epilepsy, not a brain problem, not a heart attack

• Sit down to urinate rather than standing, especially after being unwell, at night, or on waking
• Get up slowly from bed before going to toilet - sit on the edge of the bed for 1-2 minutes first (prevent orthostatic drop)
• Urinate more frequently - avoid over-distending the bladder (reduces the pressure release trigger)
• Maintain good hydration - especially during febrile illness
• Avoid straining at micturition
• At the first sign of lightheadedness (prodrome), lie down immediately or perform physical counterpressure maneuvers (leg crossing, squatting, tensing the thighs)
• Avoid hot environments and prolonged standing

• If prodrome felt (dizziness, darkening of vision): cross legs, squat, tense leg/abdominal muscles
• Reduces syncope recurrence by ~19% (Absolute Risk Reduction)

• During illness, encourage oral rehydration
• Adequate daily fluid intake (2-3 litres/day)
• Increased salt intake can help volume-replete patients with recurrent vasovagal syncope

Pharmacological (Only if Recurrent)

Follow-Up Plan

1. Paediatrician review within 1-2 weeks - reassess, review investigation results
2. Paediatric cardiology referral if:
   • ECG abnormality
   • Murmur present
   • Syncope recurs
   • Family history of sudden cardiac death
3. Echocardiogram: Order if any cardiac red flags emerge
4. Parent and school education: Ensure school staff are aware of the condition and know not to alarm if a brief fainting episode occurs; no exercise restrictions needed unless cardiac cause found

Summary

Differential Diagnosis: 14-Year-Old Male with 2-Minute Loss of Consciousness During Micturition

"Transient loss of consciousness may be caused by trauma, intoxication, seizures, hypoglycemia, subarachnoid hemorrhage, cerebrovascular disease (involving the brainstem), or syncope... The first pivotal step is to distinguish syncope from nonsyncopal causes."

• Symptom to Diagnosis: An Evidence-Based Guide, 4th Ed.

"Syncope is the final common pathway for a wide variety of underlying causes, making for a broad differential diagnosis."

• Rosen's Emergency Medicine

Framework: Two-Tier Approach

TRANSIENT LOSS OF CONSCIOUSNESS (TLOC)
         │
         ├── NON-SYNCOPAL CAUSES
         │       (seizure, metabolic, neurological, psychogenic)
         │
         └── TRUE SYNCOPE (global cerebral hypoperfusion)
                 ├── Reflex / Neurally Mediated
                 ├── Orthostatic
                 └── Cardiac

1. Abrupt onset
2. Brief duration (seconds to minutes)
3. Complete, spontaneous, rapid recovery - no postictal confusion

TIER 1: NON-SYNCOPAL CAUSES OF TLOC

1. Seizure Disorder ⚠️ (Most Important Mimic)

• 2 minutes of LOC is on the longer end for syncope (typical syncope lasts seconds)
• Must actively exclude epilepsy in every adolescent with LOC

• Tonic-clonic (jerking) limb movements during the episode
• Tongue biting (lateral tongue biting is highly specific for seizure)
• Urinary/faecal incontinence
• Prolonged postictal confusion (lasting >5 minutes after regaining consciousness)
• Cyanosis during the event
• Head turning to one side
• Prior aura (strange smell, déjà vu, visual phenomena)
• History of prior unprovoked seizures or febrile convulsions

"Convulsive syncope is an episode of syncope of any cause that is sufficiently prolonged to result in a few clonic jerks; the other features are typically syncopal and should not be confused with epileptic seizures."

• Bradley & Daroff's Neurology in Clinical Practice

2. Hypoglycemia

• Patient had 2 days of febrile illness with likely poor oral intake
• 14-year-old with reduced dietary intake during illness
• Hypoglycemia can cause loss of consciousness that may be complete or partial

• Reduced oral intake / prolonged fasting during illness
• Diaphoresis, tremor, palpitations before LOC
• Recovery may be slower and incomplete until glucose is given
• Underlying diabetes (Type 1 DM must be considered in adolescents)

3. Psychogenic (Functional) Non-Epileptic Attack (PNEA)

• Common in adolescents and young adults, more so in females but occurs in males
• Stress around illness, school, or social circumstances

• Prolonged duration (often >2 minutes, can last many minutes)
• Eyes usually closed during episode (in true syncope, eyes are typically open/rolled up)
• Resistance to eye opening during episode
• Out-of-phase, asynchronous limb movements
• Immediate awareness of surroundings on "coming round"
• Occurs in emotionally charged contexts
• No physiological correlate (normal EEG during event)

4. Subarachnoid Haemorrhage (SAH)

• Can present with sudden LOC
• The effort of straining during micturition (Valsalva-like) can precipitate a bleed from an aneurysm

• Sudden thunderclap headache ("worst headache of my life") immediately before or during LOC
• Nausea, vomiting, neck stiffness on examination
• Does NOT fully resolve - headache persists after regaining consciousness

5. Vertebrobasilar TIA / Cerebrovascular Disease

• Brainstem ischaemia can impair the reticular activating system → LOC
• Very rare in a 14-year-old but part of the complete differential

• Associated diplopia, dysarthria, ataxia, dysphagia (posterior circulation symptoms)
• LOC may occur in context of neck movement
• Not a clean isolated event

TIER 2: TRUE SYNCOPE - THREE CATEGORIES

CATEGORY A: REFLEX (NEURALLY MEDIATED) SYNCOPE

A1. Micturition Syncope - LEADING DIAGNOSIS ✅

• Occurs specifically during urination
• Male adolescent (classic demographic)
• Standing position
• Febrile illness → fever lowers threshold + dehydration reduces preload
• Complete spontaneous recovery
• Afebrile now (the fever was the "tipping factor")

"Micturition syncope most commonly occurs in men during or after micturition... The syncopal propensity may increase with fever."

• Bradley & Daroff's Neurology in Clinical Practice

A2. Vasovagal Syncope (Neurocardiogenic Syncope)

• Most common cause of syncope in young people (20-33% of cases)
• Micturition syncope shares the same underlying neurocardiogenic mechanism
• Some episodes of vasovagal syncope can be triggered by voiding

• Young male
• Trigger (urination as a stressor/pain/discomfort)
• Febrile illness → volume depletion

• Prodrome: sweating, nausea, lightheadedness, warmth, dimming vision
• Triggers: prolonged standing, emotional stress, pain, crowded warm environment
• Recovery immediate on lying flat

A3. Cough Syncope (Tussive Syncope)

• The patient has a URTI with cough and cold for 2 days
• Paroxysmal coughing → raised intrathoracic pressure → reduced venous return → hypoperfusion

• Syncope occurring specifically during a coughing paroxysm, not urination
• History of severe/persistent cough
• Less likely here since the trigger was clearly micturition, but both could coexist

"Situational syncope is defined by its close association with a specific action such as urination, defecation, coughing, sneezing, swallowing, laughing..."

• Rosen's Emergency Medicine

A4. Carotid Sinus Syndrome

• Reflex syncope subtype - undue sensitivity of carotid sinus to pressure
• Straining/neck turning during urination conceivably stimulates carotid sinus

CATEGORY B: ORTHOSTATIC (POSTURAL) SYNCOPE

B1. Dehydration / Volume Depletion ⚠️ (Active Alternative)

• 2 days of fever, cold, likely poor oral intake
• Volume depletion → reduced preload → on standing to urinate, insufficient cardiac output → syncope
• Orthostatic hypotension from dehydration is a common and important cause

• Confirmed by postural BP drop (≥20 mmHg systolic fall on standing)
• Dry mucous membranes, reduced skin turgor
• History of poor oral intake, vomiting, or diarrhoea during illness

B2. Drug/Medication-Induced Orthostatic Hypotension

• Patient may have taken medications for fever/cold: antihistamines, decongestants, some antipyretics
• Alpha-blockers, antihistamines, and phenothiazines can all cause orthostatic hypotension

B3. Autonomic Dysfunction

• Post-infectious autonomic neuropathy (rare, follows viral illness)
• Primary dysautonomia in adolescents (Postural Orthostatic Tachycardia Syndrome - POTS)

• Common in teenagers after viral illness
• Characterized by heart rate increase ≥30 bpm on standing without significant BP drop
• Symptoms: lightheadedness, palpitations, fatigue on standing
• Can present with frank syncope

CATEGORY C: CARDIAC SYNCOPE ⚠️⚠️ (MUST NOT MISS)

C1. Long QT Syndrome (LQTS) ⚠️⚠️ - MUST NOT MISS

• Congenital ion channel abnormality → prolonged ventricular repolarization → Torsades de Pointes (TdP) VT → syncope or sudden death
• One of the most common causes of sudden cardiac death in young people
• Can be completely silent between episodes

• Family history of unexplained sudden cardiac death, drowning, or recurrent fainting
• Syncope triggered by exercise, sudden loud noise, or emotional stress
• Congenital neural deafness (Jervell and Lange-Nielsen syndrome)
• QTc >450 ms (male) on ECG

C2. Hypertrophic Cardiomyopathy (HCM) ⚠️⚠️ - MUST NOT MISS

• Most common cause of sudden cardiac death in young athletes and adolescents
• LOC during/after physical activity or Valsalva (straining) is characteristic
• Outflow tract obstruction worsens with Valsalva and standing

• Family history of HCM or unexplained sudden death in young family member
• Exertional dyspnoea, chest pain, or syncope during physical activity
• Systolic murmur that increases on standing or Valsalva (pathognomonic)
• LVH pattern on ECG

C3. Wolff-Parkinson-White Syndrome (WPW) / SVT

• Accessory pathway → SVT → rapid ventricular rate → reduced cardiac output → syncope
• Common cause of palpitation-associated syncope in young people

• Palpitations, racing heart, or fluttering sensation before LOC
• Abrupt onset and offset of symptoms
• Delta waves on resting ECG (short PR, slurred QRS upstroke)

C4. Brugada Syndrome ⚠️

• Sodium channelopathy → VF/VT → sudden death or syncope
• Crucially: fever unmasks or worsens Brugada syndrome - directly relevant to this febrile patient

• Family history of sudden death, particularly at night
• Characteristic ECG: coved-type ST elevation in V1-V2 (may only appear with fever or sodium channel blockers)
• Syncope or cardiac arrest at rest or sleep

C5. Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)

• Fibro-fatty replacement of RV → VT → syncope/sudden death
• Adolescent/young adult presentation
• Exercise-related syncope common

C6. Cardiac Channelopathies - Short QT Syndrome / Catecholaminergic Polymorphic VT (CPVT)

• Exercise or emotion-triggered bidirectional/polymorphic VT → syncope
• No structural heart disease, normal resting ECG
• Family history of sudden death during exercise

C7. Structural Obstructive Causes (Rare in this Age)

C8. Pulmonary Embolism (PE)

Summary Table: Complete Differential Diagnosis

The Diagnostic Key: Two Features Unique to This Case

1. The trigger is specifically micturition → This is the hallmark of situational syncope, making reflex syncope the leading hypothesis by far.
2. Concurrent febrile illness → This is not coincidental; it is a recognized precipitant/unmasker of:
   • Micturition syncope (fever → vasodilation → lowered threshold)
   • Brugada syndrome (fever is a classic unmasker - must get ECG during febrile period or pharmacological challenge)
   • Long QT syndrome (some mutations are temperature-sensitive)
   • Dehydration → orthostatic contribution