Hyperventilation Syndrome: Symptoms, Causes & Immediate Relief

Hyperventilation = breathing in excess of metabolic needs → ↓PaCO₂ (hypocapnia) → respiratory alkalosis → cerebral vasoconstriction & ion shifts → symptoms.

Symptoms (Acute)

• Respiratory: Air hunger, dyspnea, sighing, yawning.
• Neurologic: Lightheadedness, dizziness, paresthesias (perioral, fingertips), carpopedal spasm (tetany), weakness, visual changes, confusion, near-syncope.
• Cardiovascular: Palpitations, tachycardia, chest pain/tightness (mimics ischemia).
• GI: Nausea, bloating, aerophagia.
• Psychological: Anxiety, panic, sense of doom, depersonalization.

Chronic/Subtle Presentation

• Persistent sighing, yawning, vague dyspnea, fatigue, anxiety, insomnia, muscle tension.
• Often misdiagnosed as asthma, cardiac, or neurologic disorder.

Causes

• Anxiety/panic disorder (most common).
• Pain, fear, stress.
• Medical: Asthma/COPD exacerbation, PE, metabolic acidosis (DKA, sepsis), salicylate toxicity, pregnancy, CNS lesions.
• Iatrogenic: Mechanical ventilation (excess rate/tidal volume).

Immediate Management

1. Reassurance: "You're breathing too fast. I'll help you slow down."
2. Controlled Breathing:
   • Nasal breathing (increases resistance).
   • Pursed-lip exhalation (prolongs expiration).
   • Box breathing: 4 in / 4 hold / 4 out / 4 hold.
   • Diaphragmatic breathing (hand on abdomen).
3. Rebreathing (if needed): Paper bag or cupped hands over nose/mouth — controversial (risk hypoxia if underlying PE, cardiac, metabolic acidosis). Use only if confident diagnosis.
4. Treat underlying cause: Anxiety → CBT, SSRIs; Asthma → bronchodilators; DKA → insulin/fluids.

When to Seek Emergency Care

• Chest pain, syncope, focal neurologic deficits.
• Suspected PE, MI, stroke, DKA, sepsis.
• Symptoms persist despite coaching.
• First episode without clear trigger.

Hyperventilation is frightening but rarely dangerous if primary. Always rule out medical causes first.