A 3-year-old 4.56-kg castrated male domestic shorthair cat was referred because of bradycardia. The cat had had a decreased appetite for 2 days but did not have any other history of important medical problems.
At the time of evaluation, the cat was weak and showed signs of depression. Physical examination revealed tachypnea (respiratory rate, 52 breaths/min) and normothermia (rectal temperature, 38.5 °C). A normal heart rate (140 beats/min) was detected, and the heart rhythm was regular. There were no cardiac murmurs or abnormal breath sounds during thoracic auscultation. The femoral pulse quality was normal, and no cold extremities were