An 11-year-old female poodle weighing 2.4 kg was referred to our hospital for cardiogenic pulmonary edema caused by myxomatous mitral valve disease about 1 month prior, since when it had been in and out of the hospital repeatedly. After receiving the diagnosis of mitral regurgitation stage C from the American College of Veterinary Internal Medicine, the patient was admitted to the hospital for treatment. After intensifying the drug therapy, Mitral valve plasty was planned. Since the patient weighed less than 3 kg, the 8 French cannula was difficult to insert; therefore, we decided to use a 14 G dialysis needle catheter as a substitute. The total extracorporeal circulation time was 133 min, aortic cutoff time was 84 min, aortic cutoff rate was 63.2%, and minimum rectal temperature was 26.6℃. No increase in perfusion pressure was observed when the target perfusion volume was achieved at the minimum or maximum rectal temperatures. This case demonstrates that the 14 G dialysis needle can be used as a blood-feeding cannula in small dogs. It is available in Japan, so it is expected to be a useful alternative for blood-feeding cannulas in small dogs.

A 13-year-old spayed female domestic short-haired cat presented with sudden onset of right forelimb lameness and dyspnea. Thoracic radiography revealed an enlarged heart and pleural effusion, and congestive heart failure and thromboembolism of the right forelimb were suspected. Echocardiography showed marked dilatation of both atria and loss of A wave in the left ventricular inflow velocity waveform and right ventricular inflow velocity waveform, despite normal ventricular structure and motility. In addition, electrocardiography confirmed absence of P waves and junctional escape or idioventricular rhythm, leading to the clinical diagnosis of unclassified cardiomyopathy and persistent atrial standstill. Postmortem examination revealed that the cat had persistent atrial standstill caused by atrial myopathy.