Postoperative periods of confusion or memory loss after CABG due to anesthesia, meds, CPB, and hypothermia typically resolve within how many hours?

• A. 1-2 hours
• B. 4-8 hours
• C. 12-24 hours
• D. 24-48 hours

Answer: (B)

Postoperative cognitive changes after CABG tied to anesthesia, medications, cardiopulmonary bypass, and mild hypothermia are usually temporary. As the anesthetic effects wear off and metabolic and perfusion parameters normalize, most patients regain orientation and memory within a few hours. The typical window is 4–8 hours, reflecting the time needed for drug clearance and brain recovery after these intraoperative insults. Shorter durations (like 1–2 hours) are less common because it takes time for sedation to fade, while longer durations (12–24 or 24–48 hours) would suggest other causes beyond routine anesthesia-related recovery. If confusion persists well beyond the expected window, clinicians would evaluate for additional issues such as stroke, ongoing hypoperfusion, electrolyte disturbances, infection, or medication effects.