Research overview: hypoxemia and positioning in recumbent big cats

Large felids under anesthesia frequently develop hypoxemia, low blood oxygen, due to the effects of recumbency and body mass on lung function, hypoventilation from anesthetic drugs, and ventilation-perfusion mismatch. Recognizing this led to routine pulse oximetry and frequent provision of supplemental oxygen during big-cat immobilization. This overview compiles the anesthesia literature rather than one citation, describing why large recumbent felids are prone to inadequate oxygenation, how positioning, such as sternal recumbency where feasible, and oxygen supplementation mitigate the problem, and why monitoring oxygenation is a priority. It matters because unrecognized hypoxemia can cause serious harm during procedures, and simple interventions like oxygen delivery substantially improve safety, making attention to oxygenation a standard component of responsible big-cat anesthesia.