Choice of opioid supplementation for day-case rigid bronchoscopy:a randomized placebo-controlled comparison of a bolus of remifentanil and alfentanil.

Objective: To compare the efficacy of different bolus doses of remifentanil, alfentanil, and saline at controlling the hemodynamic responses to day-case rigid bronchoscopy under general anesthesia.

Design: Prospective, randomized, double-blind, placebo-controlled study.

Setting: Tertiary referral cardiothoracic hospital, single center.