- About 6% of feline congenital heart defects.
- Cause : combination of defects - pulmonic stenosis, high ventricular septal defect (VSD), dextroposition/overriding aorta; plus right ventricular hypertrophy.
- Signs : usually stunted and cyanotic.
- Diagnosis : radiographic signs of right-sided enlargement, cardiac murmur, ultrasonography.
- Treatment : none to medical to cardiac surgery, depends on severity.
- Prognosis : poor to grave.
- Cyanosis, affecting cranial and caudal mucosae uniformly.
- Dyspnea and tachypnea.
- Murmurs [Cardiac sounds: overview] - forward of left heart base (pulmonic stenosis); right sternal border (VSD).
- Signs of right-sided congestive heart failure, eg hepatomegaly, ascites (rare).
Differential diagnosisSystolic murmurs in young cats
- Poor if mild.
- Hopeless if severe.
Expected response to treatment
- Exercise tolerance.
Reasons for treatment failure
- Severity of defect.
- Thrombosis of surgically induced shunt.