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Clinical Trial
Journal Article
Randomized Controlled Trial
Attenuation of the pressor response to laryngoscopy and tracheal intubation with intravenous verapamil.
Acta Anaesthesiologica Scandinavica 1989 April
This study was undertaken in surgical patients in order to evaluate the effects of intravenous verapamil on the circulatory responses to laryngoscopy and tracheal intubation. Laryngoscopy for tracheal intubation was initiated 1 min after thiamylal 5 mg.kg-1 and succinylcholine 1.5 mg.kg-1 in the control group (n = 21). The verapamil group (n = 23) received intravenous verapamil 0.1 mg.kg-1 immediately after thiamylal-succinylcholine administration. The resulting changes in mean arterial pressure (MAP) and heart rate (HR) were continuously measured. Compared with the control group, MAP increased less in response to laryngoscopy and tracheal intubation (56 +/- 13% versus 25 +/- 15% above baselines, P less than 0.01) and returned toward baseline sooner in patients receiving verapamil. For hypertensive patients, MAP increases from baseline after intubation were 18 +/- 9% in the verapamil group, and 53 +/- 14% in the control group, respectively (P less than 0.001). Increases in HR response to laryngoscopy for intubation were comparable in both groups. We conclude that intravenous verapamil is effective in reducing pressor responses during endotracheal intubation, especially in hypertensive patients.
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