Atrioventricular dissociation in a cat with persistent truncus arteriosus

A 10-month-old female domestic shorthaired (DSH) cat was presented with peracute respiratory problems. Physical examination revealed dyspnoea, tachypnoea, cyanosis, weak pulse and bradycardia. Auscultation showed pulmonary crepitation and attenuated heart sounds and a pansystolic grade V/VI murmur. The electrocardiogram showed atrioventricular dissociation identified as third-degree sinoatrial block. X-rays showed increased density in the ventral and middle zones of the thorax and loss of definition of the cardiac silhouette and increased diffuse radiographic density of the entire abdomen.Echocardiography revealed dilatation of the right atrium and concentric biventricular hypertrophy. A type 1 persistent truncus arteriosus was diagnosed at necropsy.This is the first case report of this type of arrhythmia in a cat with persistent truncus arteriosus, and its relationship with the described congenital cardiac anomaly is discussed.

Automated summary

This is a case report of a 10-month-old female domestic shorthaired cat presenting with severe respiratory issues. The cat exhibited dyspnea, tachypnea, cyanosis, weak pulse, and bradycardia. Physical examination revealed pulmonary crepitation, attenuated heart sounds, and a pansystolic grade V/VI murmur. Atrioventricular dissociation was identified on the electrocardiogram, indicating third-degree sinoatrial block. X-rays showed increased density in the thoracic ventral and middle zones, as well as loss of definition of the cardiac silhouette and increased diffuse radiographic density of the abdomen. Echocardiography revealed right atrium dilatation and concentric biventricular hypertrophy. Necropsy confirmed the diagnosis of type 1 persistent truncus arteriosus. This is the first report of this arrhythmia in a cat with persistent truncus arteriosus, and its association with the described congenital cardiac anomaly is discussed.