Describe Propofol Infusion Syndrome and its context.

• A. It is a rare but serious complication with prolonged high-dose propofol infusions causing metabolic acidosis, rhabdomyolysis, cardiac failure, and renal failure
• B. It is a common mild nausea
• C. It is a typical reaction with low-dose propofol
• D. It occurs only in children

Answer: (D)

Propofol Infusion Syndrome is a rare but life‑threatening complication of propofol when it is given for prolonged periods or at high doses. The Syndrome presents with a dangerous combination of metabolic acidosis (often with rising lactate), rhabdomyolysis (elevated CK and myoglobin), and progressive cardiac failure or shock, frequently accompanied by kidney dysfunction; liver involvement and hyperlipidemia may also be seen. The underlying cause is believed to be mitochondrial dysfunction and impaired fatty acid oxidation from sustained propofol exposure, which leads to energy failure in heart and skeletal muscle and unchecked catabolism in multiple organs.

Key risk factors include high infusion rates (often around or above 4 mg/kg/hour) and extended duration of use, especially in critically ill patients, and the use of vasopressors, catecholamines, or steroids that can exacerbate metabolic stress. Because it can affect adults and children, it is not limited to a single age group. If PRIS is suspected, the crucial step is to discontinue propofol immediately and switch to an alternative sedative while providing aggressive supportive care to correct acidosis, treat rhabdomyolysis, maintain organ perfusion, and manage cardiac or renal failure.

Understanding this helps distinguish PRIS from more common, milder drug reactions like nausea or light sedation effects, which do not involve such a constellation of systemic metabolic and organ failures and are not tied to prolonged high-dose exposure. Prevention centers on limiting dose and duration when possible and vigilant monitoring for early signs in patients requiring long or high-dose propofol infusions.