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  • Title: Effect of verapamil on the cardiovascular responses to tracheal intubation.
    Author: Yaku H, Mikawa K, Maekawa N, Obara H.
    Journal: Br J Anaesth; 1992 Jan; 68(1):85-9. PubMed ID: 1346745.
    Abstract:
    We have studied the efficacy of verapamil in attenuating the cardiovascular responses to tracheal intubation in three groups of ASA grade I patients given verapamil 0.05 mg kg-1 or 0.1 mg kg-1 or saline 45 s before the start of laryngoscopy. Anaesthesia was induced with thiopentone 5 mg kg-1 i.v. and tracheal intubation was facilitated with vecuronium 0.2 mg kg-1. During anaesthesia, ventilation was assisted or controlled with 1% enflurane and 50% nitrous oxide in oxygen. In patients who received saline, there was a significant increase in mean arterial pressure and rate-pressure product associated with tracheal intubation. The increases were significantly less in verapamil-treated patients compared with those in the control group, although verapamil failed to prevent tachycardia caused by laryngoscopy and intubation.
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