A Possible Case of Neurogenic Pulmonary Edema in a Sheep following Intracranial Surgery
Journal: Journal of Clinical Anesthesia and Management (Vol.1, No. 3)Publication Date: 2016-05-07
Authors : Daniela Casoni Annalisa EJ Giovannini Christina M Precht Chiara Adami;
Page : 1-4
Keywords : Neurogenic pulmonary edema; Non-invasive blood pressure; Normoglycemia;
Abstract
Objective: To describe presentation, treatment and outcome of a sheep that developed acute respiratory distress after intracranial surgery Case summary: A 3-year-old female crossbred sheep weighing 64 kg was anaesthetized for intracranial surgery as a part of a research project. Premedication and induction of anesthesia were uneventful as well as tracheal intubation. Anesthesia was maintained with isoflurane in a 50% mixture of oxygen and air, fentanyl (5-15 µg kg-1h-1) and lidocaine (1.8 mg kg-1h-1). During anesthesia, an increased alveolar-arterial oxygen gradient was calculated on the basis of arterial blood gas analysis: inspiratory fraction of oxygen was increased and a recruitment manoeuvre was performed. After 210 minutes of anesthesia, the sheep was let recover with oxygen supplementation under monitoring of pulse-oxymetry, capnography, inspired and expired oxygen, temperature and invasive blood pressure. At tracheal extubation no signs of regurgitation or aspiration were noticed. Twenty-five minutes later, the sheep showed deterioration of neurological status and clonic seizure responsive to diazepam. After transient tachycardia, blood pressure rose acutely and sinus bradycardia followed. Severe tachypnea started in few minutes accompanied by loud respiratory noises and harsh diffuse crackles on both sides of the thorax. Foamy blood nasal exudates discharged from the nostrils. Neurogenic pulmonary edema as a sequel of increased intracranial pressure was suspected and treated with intravenous mannitol (0.5 gkg-1) and furosemide (4 mgKg-1). Hypoxemia was successfully managed with oxygen supplementation. Motor and cognitive functions improved progressively and were deemed normal within 12 hours from the episode, when arterial partial pressure of oxygen was 11.7 kPa (88 mmHg) at room air. New information provided: Severe pulmonary complications may be observed after iatrogenic neurological injury in sheep. Neurogenic pulmonary edema should be taken into account among the differential diagnoses of abrupt respiratory distress following seizure.
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