Abstract
This is a case of spontaneous closure of a ventricular septal defect (VSD) after being diagnosed by echocardiography in a dog. Holosystolic murmur (grade III of VI) was heard at the 4th right intercostal space of a male cavalier king charles spaniel when he was three months old. Dorsoventral and lateral thoracic radiographs showed a right ventricular enlargement, loss of cranial waist and a slightly increased shadow of peripheral pulmonary vascularity. Echocardiographic examinations revealed a left-to right shunting though a small solitary defect in the membranous septum. At the age of four months, cardiac murmur was inaudible, and a mosaic image depicted by shunting flow could not be seen in the right ventricle on echocardiogram so that the diagnosis of spontaneous closure of a ventricular septal defect was made. The patient has been doing well without requiring any medication since then. In conclusion, echocardiographic follow-ups are considered excellent as an noninvasive method in evaluating pathosis of VSD periodically in dogs.
