the cardiovascular responses , speed of anesthetic induction , incidence of chest wall rigidity , need for anesthetic supplements ( phentolamine , n2o , and nitroprusside ) to control intraoperative hypertension , and speed of postoperative recovery were measured and compared in 44 patients undergoing aortic and mitral valvular replacement with fentanyl-o2 or sufentanil-o2 anesthesia .
C0015846
fentanyl
C0143993
sufentanil