The paper presents observations collected from 7 horses during general anaesthesia with controlled ventilation (CV) used for surgical procedures (laparotomy, correction of long bone fractures). After the horses had been restrained (guiphenesin 0.1 g/kg b.w.), spontaneous ventilation was eliminated by the use of muscle relaxant (pancuronium 0.1 mg/kg b.w.) and replaced by CV (IPPV = 25-35 cm H2O f = 13, Vmin = 52 1/min, I/E = 2:3) realized by the „bag in bix” respirator. General anesthesia was maintained using an inhalation technique for an average of 110 min. using 2 vol% halothane with oxygen administered in a quantity of 2.5-3.5 1/min. Artificial ventilation maintaining breathing higher than natural (values Vt and V min) protected the horses from metabolic disturbances. The anesthesia performed with an anaesthetic-respiratory apparatus made in our department according to the conception of the author was characterized by a complication free course with a preferably rapid induction and a fast recovery. The variant of anaesthetization with mechanical respirators should be applied for long-lasting operations where full relaxation and no motion is required. This type of procedure gives better conditions for work the abdominal cavity and orthopedic procedures.
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