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British Journal of Anaesthesia, 1985, Vol. 57, No. 4 382-388
© 1985 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

JET VENTILATION USING LOW OR HIGH FREQUENCIES, DURING BRONCHOSCOPY

M. FISCHLER, M.D., B. BOURRELI, M.D., J. C. MELCHIOR, M.D., G. VOURCH, M.D., F. SEIGNEUR, M.D. and C. LAVAUD

Départment d'Anesthésie Centre Medico-Chirurgical Foch, 40 rue Worth, 92151 Suresnes, France
Départment de Pneumologie Centre Medico-Chirurgical Foch, 40 rue Worth, 92151 Suresnes, France
GLEM 92260 Fontenay-aux-Roses, France

Correspondence to M. F.

Jet ventilation, through a bronchoscope, was evaluated using a lung model (normal compliance and increased airway resistance). Three I/E ratios (0.25, 0.43, 0.67) and seven rates of ventilation (from 20 to 230 cycles per min (c min–1)) were studied with the bronchoscope either unoccluded or partially occluded by a telescope. Increases in I/E ratio induced increases in minute ventilation, peak airway pressure, end-expiratory pressure and lung volume. Increase in the rate of ventilation decreased peak airway pressure, increased endexpiratory pressure and lung volume; minute ventilation increased in parallel with the increase in the rate of ventilation or remained constant when a high I/E ratio was used. The introduction of the telescope reduced minute ventilation, as a result of a decrease in the amount of air entrained, and increased end-expiratory pressure and lung volume. The risk of barotrauma as a result of high peak pressure is reduced during high frequency jet ventilation, but the increase in lung volume, particularly when the telescope is introduced, may be of clinical importance.


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