Alveolar recruitment manoeuvre in a Shetland pony anaesthetized for laparoscopic castration (original) (raw)

Wiener tierärztliche Monatsschrift

Abstract

During general anaesthesia gas exchange is disturbed in most horses. During laparoscopy in dorsal recumbency, increased abdominal pressure and head down position may increase ventilation perfusion mismatch, leading to compromised oxygenation and ventilation. A healthy Shetland pony was anaesthetized for laparoscopic castration in dorsal recumbency. After premedication with detomidine and induction with climazolam and ketamine, isoflurane in oxygen was used to maintain anaesthesia. Standard large animal anaesthetic equipment was used, with the addition of a custom-built positive end-expiratory pressure (PEEP) valve. Calculated shunt fraction decreased from 0.25 in the spontaneously breathing pony to 0.17 after starting intermittent positive pressure ventilation. Following an alveolar recruitment manoeuvre consisting of a series of increases in positive inspiratory pressure and PEEP, the shunt fraction decreased to 0. At the same time the abdominal cavity was inflated and the pony was...

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