## Clinical Analysis **Key Point:** Propofol is a potent negative inotrope and peripheral vasodilator, causing dose-dependent hypotension — the most common hemodynamic complication of induction in elderly and comorbid patients. ### Why Propofol is the Culprit The clinical sequence here is classic: 1. Propofol induction → myocardial depression (↓ contractility) + vasodilation (↓ SVR) 2. Hypotension occurs within 1–2 minutes of induction 3. Bilateral breath sounds present → no pneumothorax 4. Normal capnograph → no airway obstruction or CO₂ insufflation complication 5. SpO₂ drop is *secondary* to hypotension and reduced cardiac output, not primary hypoxia **High-Yield:** Propofol causes hypotension in 20–30% of patients, especially those who are: - Elderly (>60 years) - Hypovolemic - Critically ill - On vasodilators or beta-blockers ### Management of Propofol-Induced Hypotension | Intervention | Rationale | |---|---| | **Reduce propofol dose** | Use 1–1.5 mg/kg in elderly/comorbid patients instead of 2 mg/kg | | **IV fluid bolus** | 250–500 mL crystalloid to restore preload | | **Vasopressor (phenylephrine or ephedrine)** | Restore SVR and BP | | **Reduce FiO₂ gradually** | Once BP stabilized; 100% O₂ is not needed long-term | | **Head-down position** | Improve cerebral perfusion | **Clinical Pearl:** The hypoxia (SpO₂ 88%) is a *consequence* of low cardiac output and poor tissue perfusion, not primary lung pathology — this is why the capnograph is normal and breath sounds are bilateral. **Warning:** Do not confuse propofol-induced hypotension with anaphylaxis. Anaphylaxis would present with bronchospasm, wheeze, urticaria, and rapid deterioration; this patient has clear lungs and a normal capnograph.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.