Complications during apnea testing in the determination of brain death: predisposing factors.

Apnea testing in brain death determination may result in cardiovascular complications. Hypotension occurred in 24% and cardiac arrhythmias occurred in <1% of the 145 apneic oxygenation procedures. Complications were noted in only 15% of apnea tests performed without any predisposing factors. Significantly more complications (39%) were observed in apnea tests with inadequate precautions, particularly in apnea tests without adequate preoxygenation (50%).