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British Journal of Anaesthesia, Vol 82, Issue 1 87-89, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia

LABORATORY INVESTIGATIONS

I.v. lidocaine worsens histamine-induced bronchoconstriction in dogs

K. Hirota, Y. Hashimoto, T. Sato, H. Yoshioka, T. Kudo, H. Ishihara and A. Matsuki
Department of Anaesthesiology, University of Hirosaki School of Medicine, Hirosaki 036-8562, Japan

We have assessed the effect of lidocaine (lignocaine) on histamine- induced bronchoconstriction by direct visualization with a superfine fibreoptic bronchoscope. Seven mongrel dogs were anaesthetized with pentobarbital (pentobarbitone) 30 mg kg-1 followed by 2 mg kg-1 h-1 and pancuronium 200 micrograms kg-1 h-1. The trachea was intubated with a tracheal tube containing a second lumen for insertion of a 2.2-mm fibreoptic bronchoscope. This allowed estimation of the bronchial cross- sectional area (BCA) of the third bronchial bifurcation of the right lung. We used NIH image, a public domain image processing and analysis program. Bronchoconstriction was produced with a bolus dose of histamine 10 micrograms kg-1 i.v. followed by continuous infusion of 500 micrograms kg-1 h-1. After 30 min the following i.v. doses of lidocaine were given: lidocaine 0 (saline), 0.01, 0.1, 1.0 and 10 mg kg- 1 at 10-min intervals. BCA was assessed 90 s after each dose. Arterial blood sampling was performed for measurement of plasma catecholamines. Lidocaine 1.0 and 10 mg kg-1 significantly reduced histamine-decreased BCA from 69.7 (SEM 4.1)% to 59.8 (7.3)% and 34.3 (6.8)%, respectively. Plasma concentrations of catecholamines decreased significantly after lidocaine 10 mg kg-1 i.v. In addition, there was a significant correlation between percentage decreases in plasma concentrations of epinephrine (adrenaline) and norepinephrine (noradrenaline) and reduction in %BCA (epinephrine-BCA, P < 0.01, r = 0.674; norepinephrine- BCA, P < 0.01, r = 0.510). This study suggests that i.v. lidocaine may exacerbate histamine-induced bronchoconstriction by a sympatholytic effect. This may have therapeutic implications for patients with acute asthma or anaphylactic shock who may become dependent on circulating catecholamines.
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