Dynamic left ventricular outflow tract obstruction (DLVOTO) is a common
condition in cats and humans. In this case report, a dog is described with
DLVOTO secondary to severe intra-abdominal hemorrhage caused by a
hemangiosarcoma. The dog was a 9-year-old, 35.7-kg, spayed female German
Shepard dog that presented with a history of tachypnea and collapse. A Levine
II/VI systolic murmur was present at the heart base. Abdominal
ultrasonography revealed a splenic mass and a large amount of ascites.
Echocardiography showed a reduced left ventricular diameter and an
increased aortic velocity caused by systolic anterior motion (SAM) of the
mitral valve apparatus. The heart murmur and the SAM were resolved after
treatment including a splenectomy and a blood transfusion.