Demographic and Perioperative Data.

Patients were clustered according to CYP2D6 genotypes. Measures represent mean±SD or number (%) of patients.a : PM = poor metabolizers, HZ/IM = heterozygous subjects or intermediate metabolizers, EM = extensive metabolizers, UM = ultrarapid metabolizers.b : ASA = American Society of Anesthesiologists physical status; I = healthy patient, II = mild systemic disease, III = severe systemic disease, IV = severe systemic disease that is a constant threat to life.