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Congenital heart disease

Congenital heart disease - Congenital heart disease •...

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Unformatted text preview: Congenital heart disease • Often found in young asymptomatic animals • Definite breed predilections for various anomalies • Need for accurate diagnosis— – Owner issues, legal issues – Prognosis – Treatment—usually surgical correction – Breeding • Patent ductus arteriosus—PDA – Connection between left pulmonary artery and aorta. – Normal fetal circulation—shunts blood right to left , bypassing lungs – At birth, changes in pressure, oxygen tension reverse flow and close ductus – Left to right PDA has been shown to be inherited – History— • May have lost puppies in litter • Surviors may develop dyspnea, tachypnea, anorexia, weight loss • Size of defect varies, some dogs may live to adulthood – Physical— • May have bounding pulses (femoral) • Turbulence causes a continuous murmur strongest over pulmonic valve – Tests • Radiographs suggestive; echocardiogram definitve – Treatment—surgical, best done early on. • Prognosis—good • Untreated dogs have short life expectancy • Pulmonic stenosis – Narrowing of pulmonary valve area, between right ventricle and pulmonary artery, disrupts blood flow – Puppies usually asymptomatic, systolic murmur found on routine PE – Severe cases show stunted growth, dyspnea, exercise intolerance – Mild cases may live 5 or more years with no obvious effects – PE—Systolic murmur, severe cases may have right sided heart failure—ascites, hepatomegaly edema – Tests— • EKG—abnormal electrical activity due to right ventricular hypertrophy • Echocardiography can demonstrate lesion...
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Congenital heart disease - Congenital heart disease •...

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