A 38-year-old male with septic shock and hypotension (BP 85/52 mmHg, HR 118) requires emergency intubation. Regarding the choice of induction agent in this clinical scenario, all of the following are CORRECT EXCEPT:

Explanation

## Induction Agent Selection in Hemodynamic Instability ### Clinical Context: Septic Shock A hypotensive, tachycardic patient with sepsis requires an induction agent that: - Maintains or increases blood pressure - Preserves airway reflexes - Does NOT depress cardiac output or cause vasodilation - Avoids suppression of adrenocortical function (critical in sepsis) ### Pharmacological Properties in Shock | Agent | BP Effect | HR Effect | Airway Reflex | Adrenal Suppression | Use in Shock | |-------|-----------|-----------|---------------|--------------------|--------------| | **Propofol** | ↓↓ (vasodilation) | ↓ | Preserved | Minimal | **CONTRAINDICATED** | | **Ketamine** | ↑ or → (sympathomimetic) | ↑ | Preserved | Minimal | **PREFERRED** | | **Etomidate** | → (minimal change) | → | Excellent | **YES (dose-dependent)** | **ACCEPTABLE** | | **Thiopentone** | ↓↓ (myocardial depression) | ↓ | Preserved | Minimal | **CONTRAINDICATED** | **High-Yield:** In septic shock, **ketamine** is the gold standard. Etomidate is a reasonable backup, but a single induction dose causes transient (24–48 hours) adrenocortical suppression — a concern in sepsis where adrenal function is already compromised. **Key Point:** Thiopentone is NOT preferred over etomidate in shock. Thiopentone causes severe myocardial depression and hypotension — it is contraindicated in hemodynamic instability. Etomidate, despite its adrenal suppression, is vastly superior to thiopentone in this setting. **Clinical Pearl:** The "adrenal suppression" of etomidate is transient and reversible after a single induction dose; however, prolonged infusions (sedation) cause prolonged suppression. In acute induction, the benefit of hemodynamic stability outweighs this concern. ### Why the Distractor is Wrong Option 3 claims thiopentone is preferred over etomidate because it has less effect on adrenocortical function. This is factually true (thiopentone does NOT suppress cortisol), but clinically FALSE: - Thiopentone causes **profound hypotension and myocardial depression** — it is contraindicated in shock. - Etomidate, despite transient cortisol suppression, maintains hemodynamics and is far superior in this scenario. - The statement prioritizes a minor pharmacological property (adrenal effect) over the critical clinical outcome (blood pressure preservation). [cite:Gupta & Rana Clinical Anesthesia 6e Ch 8; Sepsis Guidelines 2021]