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.