Difficult or impossible tracheal extubation has previously been reported in the veterinary literature as a result of endotracheal tube (ETT) faults or due to their entanglement with oesophagostomy tubes. Inadvertent transfixation of the ETT to the trachea during oral–maxillofacial surgery is a reported cause of extubation complications in the human literature. In this case, an incident of accidental ETT cuff transfixation to the trachea of a dog undergoing surgical repair of a traumatic tracheal laceration is reported. General anaesthesia for tracheal surgery requires special consideration of airway management to reduce complications. While precautions can be taken to avoid ETT placement within the surgical field, this cannot always be avoided and measures should be implemented for detection of transfixation. If tracheal extubation complications do arise, it is important to consider the differential causes and act quickly to resolve the problem and ensure minimal distress to the animal.
Background: Loss of endotracheal tube (ETT) integrity secondary to dental damage is reported in the human literature.Objective: To describe this problem in equine anaesthesia.
Study design: Case report.Clinical summary: An 18-year-old Standardbred gelding presented out of hours with colic signs. Findings on clinical examination and pain refractory to analgesia meant that exploratory laparotomy was elected for. Prior to general anaesthesia (GA) leak testing of the anaesthetic machine was performed and the pilot balloon of the endotracheal tube (ETT) was inflated to confirm cuff integrity. Intermittent-positive pressure ventilation (IPPV) was initiated immediately following placement in dorsal recumbency and connection to the anaesthetic machine. During the inspiratory phase of IPPV, a loud gas leak was audible from the oropharynx and minimal thoracic excursion was observed, with repeated inflations of the ETT cuff unsuccessful at abolishing the leak. Due to suspicion of a defect within the silicone ETT itself, a support arm was used to abolish the curvature of the ETT, maintaining it in a straighter plane. This intervention abolished the leak allowing effective IPPV. After completion of GA, a close inspection of the ETT revealed a full-thickness laceration, thought to be a result of dental damage at an earlier date.Main limitations: A single case is described.Conclusions: This report emphasises the importance of thorough inspection of the ETT prior to use to effectively secure the airway and enable IPPV provision in critical cases.
Third-degree atrioventricular block is a haemodynamically unstable bradycardia frequently resulting in signs of lethargy, weakness and collapse. In this reported case, a four year-four month-old male neutered Cavalier King Charles spaniel diagnosed with third-degree atrioventricular block was referred for transvenous permanent pacemaker implantation. During induction of general anaesthesia, the dog suffered cardiac arrest consistent with ventricular standstill, as indicated by cessation of ventricular electrical activity on the ECG monitor and the absence of a peripheral pulse. The prior placement of transthoracic pacing pads under sedation allowed for rapid commencement of temporary transcutaneous pacing and proved effective in achieving ventricular capture with re-establishment of cardiac output. The subsequent general anaesthesia for implantation of a permanent pacemaker was uneventful. This report considers the possible causes of ventricular escape rhythm suppression and highlights the importance of ensuring availability of a temporary pacing method from the outset when anaesthetising animals with unstable and symptomatic bradycardias.
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