Ketamine as an Induction Agent in Status Epilepticus
Primary Advantages of Ketamine in Status Epilepticus
- Ketamine maintains cardiovascular stability through sympathomimetic properties, which is critical in hemodynamically compromised seizure patients 1
- The American College of Critical Care Medicine states that even one dose of etomidate for intubation is independently associated with increased mortality in children and adults with septic shock, possibly secondary to inhibition of adrenal corticosteroid biosynthesis 1
- Pediatric critical care guidelines explicitly recommend against etomidate use in critically ill children, particularly those with septic shock 1
Practical Administration Protocol
- Administer ketamine 1-2 mg/kg IV as the induction agent, followed immediately by a neuromuscular blocking agent (succinylcholine 1-1.5 mg/kg or rocuronium 1.0-1.2 mg/kg) 1, 2
- Use the lower end of the ketamine dose range (1 mg/kg) in patients with cardiovascular compromise to minimize hemodynamic effects while maintaining adequate sedation 3
- Always administer ketamine BEFORE the neuromuscular blocking agent to prevent awareness during paralysis, which occurs in approximately 2.6% of emergency department intubations 1, 2, 3
Critical Pitfalls and Caveats
- Despite ketamine's sympathomimetic properties, paradoxical hypotension can occur in critically ill patients with depleted catecholamine stores (prolonged septic shock, severe cardiogenic shock, or adrenal exhaustion) 3
- Have vasopressors immediately available during RSI, though ketamine typically maintains hemodynamic stability better than other induction agents 1, 3
- Some observational data shows higher rates of post-intubation hypotension with ketamine (18.3%) compared to etomidate (12.4%) in emergency department RSI, though these studies included patients with difficult airways and higher baseline hypotension risk 2, 4