4 – RAID NR 1 – 2025 KLINISK REVISION INTRODUCTION Recovery after general anesthesia is associated with several risk factors for horses. Airway obstruction is one of many complications that may occur during the recovery phase (Clark-Price, 2013). The complication rate vary according to the literature. In a study by Johnston et al. (2002) the frequency was 3,7%, while other studies have revealed frequencies ranging from 0,041,4% (Thomas et al., 1987), 0,3-1,5% (Senior et al., 2007) to 0,3% (Dugdale et al., 2016). Complete or partial airway obstruction due to nasal edema is a common respiratory complication during the recovery period after general anesthesia (Doherty & Valverde, 2006; Dugdale & Taylor, 2016; Muir & Hubbel, 2009). This is a problem particularly in horses placed in dorsal recumbency, since the head is below the level of the heart of the horse, which cause an increased hydrostatic pressure in the head (Muir & Hubbel, 2009). The crosssectional area of the nasal passage is reduced, which cause increased breathing resistance. Prolonged anesthesia also increases the risk of swelling of the outer airways (Ackburally & Flaherty, 2009). Another risk factor of airway obstruction is nasal bleeding (Doherty & Valverde, 2006). At the hospital where the data was collected, a common complication when the horse is placed in the recovery and NCERT CLINICAL AUDIT 2021-09-24 An audit on the incidence, risk factors and prevention of nasal congestion of horses in recovery after general anesthesia in a veterinary hospital.
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