Efficacy of patient controlled analgesia may have a diurnal rhythm!
Richardson
N G
NG
Peckett
W R
WR
Donaldson
D R
DR
D000368:Aged; D016058:Analgesia, Patient-Controlled; D002940:Circadian Rhythm; D006801:Humans; D008297:Male; D009622:Noise; D010149:Postoperative Pain / Q000188:drug therapy*