Use of a demand valve for postoperative administration of oxygen to horses

Abstract

Summary The use of a demand valve for the administration of oxygen to horses in the post anaesthetic period was evaluated in 12 horses. Six were allowed to breathe spontaneously while the remainder were ventilated. Arterial blood gas analysis confirmed the effectiveness of the valve in correcting the potentially dangerous levels of hypoxaemia which occur postoperatively in laterally recumbent horses allowed to breathe air. Résumé L'administration d'oxygène à l'aide d'une valve à la demande durant la phase post anesthèsique a étéétudiée sur douze chevaux. Six d'entre eux furent maintenus sous ventilation assistée, les autres respirèrenl spontanément. L'analyse de gaz du sang artériel confirma l'efficacité de la valve utilisée pour corriger l'hypoxémie. Cette hypoxémie potentiellement dangereuse se produit lors du post opératoire chez les chevaux en décubitus latéral et qui respirent de l'air. Zusammenfassung Der Gebrauch eines Bedarfs‐Ventils für die Sauerstoffzufuhr an Pferde während der Aufwachzeit nach Narkose wurde bei 12 Pferden evaluiert. Sechs Pferde atmeten spontan, die restlichen wurden beatmet. Arterielle Blutgasanalysen bestätigen die Wirksamkeit des Ventils für die Korrektur potentiell gefährlicher hypoxämischer Zustände, wie sie nach Operationen in Seitenlage bei Pferden unter Spontanatmung auftreten.

The effect of two different intra-operative end-tidal carbon dioxide tensions on apnoeic duration in the recovery period in horses

“…In our study, nasal insufflation of oxygen (15 L min −1 ) and an oxygen demand valve were utilized after RSV which have been shown to improve arterial oxygenation (Waterman et al. ; Mason et al. ).…”

High inspired oxygen concentrations increase intrapulmonary shunt in anaesthetized horses

“…Fear of hypoxia and associated myopathy during field anaesthesia has led to recommendations that air-breathing should not be allowed in unconscious horses for more than 60 minutes, irrespective of the anaesthetic technique used (Matthews & Hartsfield 1993). It has also been recommended that ideally endotracheal tubes, demand valves and oxygen cylinders be available when performing field anaes-thesia, in order to impose intermittent positive pressure ventilation in the event of drug-induced apnoea (Waterman et al 1982;Taylor & Clarke 1999). It has been proposed that demand valves be used so that oxygen may be administered and the lungs periodically inflated to prevent atelectasis (Riebold et al 1980).…”

Pulmonary micro‐embolism following orthopaedic surgery in a Thoroughbred gelding

“…These include post anaesthetic forelimb lameness o r ischaemic myopathy (so-called 'radial paralysis') (Trim and Mason 1974) and spinal cord degeneration (Brearley, Jones, Kelly and Cox 1986). The only postoperative respiratory complication which has been documented in the horse is postoperative hypoxaemia (Gillespie, Hall and 3 1 e r 1969; Waterman, Jones and Richards 1982).…”