British Journal of Anaesthesia, Vol 82, Issue 2 213-216, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia
C. S. Liebenberg, R. Raw, J. Lipman, D. G. Moyes and P. E. Cleaton-Jones
The zero deadspace tracheal tube (ZEDS-TT) is a double-lumen endobronchial
tube with a truncated bronchial limb. Functionally it is unrelated to the
familiar endobronchial tube used in lung isolation surgery. It is placed in
the same position as a regular tracheal tube and, by means of special
connectors, one limb is used for inspiration and the other for expiration,
thereby greatly reducing anatomical and apparatus deadspace. In this study,
we have compared respiratory and ventilatory effects of reduction of tidal
volume (VT) via a single- lumen tracheal tube and the ZEDS-TT during
controlled ventilation with a Siemens Elema 900C Servo ventilator. Eleven
consenting adult patients (ASA I and II) undergoing elective peripheral
surgery were studied. Starting at a VT value of 10 ml kg-1, data were
recorded for each tube type. VT was reduced by 2.5 ml kg-1 every 10 min and
stabilized data recorded. Minute volume was kept constant by increasing
ventilatory frequency at each reduction in VT. We found that the ZEDS-TT
produced a significant reduction in PaCO2 and airway pressure for any VT
used, while maintaining oxygenation.
CLINICAL INVESTIGATIONS
Small tidal volume ventilation using a zero deadspace tracheal tube
Department of Anaesthesia, Baragwanath Hospital, University of the Witwatersrand, Johannesburg, South Africa
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