Which of the following is NOT a listed cause of prolonged recovery?

• A. Hypothermia
• B. Breed variation
• C. Age
• D. Coexisting disorder

Answer: (C)

Prolonged recovery after anesthesia is most often due to factors that slow drug metabolism and clearance. Hypothermia lowers metabolic rate and slows hepatic and renal processing, so anesthesia drugs stay in the body longer and wakefulness is delayed. Breed variation reflects genetic differences in how certain breeds process drugs, leading to slower clearance in some individuals. Coexisting disorders, such as liver or kidney disease or conditions that reduce tissue perfusion, impair drug elimination and prolong recovery.

Age is not typically listed as a primary cause of prolonged recovery. While very young or very old patients may have different pharmacokinetics due to organ maturity or disease, age itself isn’t usually cited as a direct, standalone factor like temperature, breed-related metabolism, or organ dysfunction.