[Prolonged respiratory depression after fentanyl administration in a patient with mitochondrial encephalomyopathy].

A 21-year-old man with mitochondrial encephalomyopathy underwent surgery for removal of a maxillary cyst. During the induction of anesthesia, the patient fell into the state of apnea after intravenous administration of fentanyl 100 microgram. Trachea was successfully intubated followed by propofol 50 mg without any muscle relaxants.