Suspected relative adrenal insufficiency in a critically ill cat

Objective: To describe a case of likely relative adrenal insufficiency (RAI) in a cat with critical illness. Case summary: A cat recovering from polytrauma developed hypotension unresponsive to intravenous fluid support and vasopressor therapy. An adrenocorticotropin hormone stimulation test documented insufficient adrenal function. Treatment with exogenous low‐dose glucocorticoids in addition to standard therapies resulted in rapid hemodynamic and clinical improvement. The cat ultimately recovered and was weaned from supplemental glucocorticoids. New or unique information provided: This is the first report of changes consistent with acquired RAI in a cat with critical illness.