British Journal of Anaesthesia, Vol 76, Issue 6 777-779, Copyright © 1996 by The Board of Management and Trustees of the British Journal of Anaesthesia
R. W. Sutherland and G. B. Drummond
We measured ventilation in 12 subjects anaesthetized with enflurane
(end-tidal concentration 1.25-1.45%) and nitrous oxide to assess the effect
of surgical stimulation on ventilation in humans. Tidal volume and
respiratory timing were measured by pneumotachograph before and just after
a standardized surgical skin incision. Surgical stimulation increased
ventilation by increasing tidal volume, which increased progressively over
the first five breaths after incision. The first breath after the stimulus
was prolonged, but the timing of the subsequent breaths returned rapidly to
the duration observed before incision. Ventilation increased from median
3.6 (quartiles 2.9, 4.3) to 5.4 (3.8, 7.0) litre min-1 (P < 0.01). The
increased tidal volume was not associated consistently with shortening of
inspiratory duration.
CLINICAL INVESTIGATIONS
Effects of surgical skin incision on respiration in patients anaesthetized with enflurane
Department of Anaesthetics, Royal Infirmary, Edinburgh EH3 9YW
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