Friday, April 24, 2009

Pulmonary Hypertension

Definition:

Mean pulmonary artery pressure (mPAP) > 25mmHg at rest or > 30mmHg during exercise. Can present with no apparent underlying disease (primary pulmonary hypertension) or in association with other diseases.

Causes:

1. Pre-capillary (in pulmonary arteries and arterioles)

Most severe. Examples: congenital heart disease (left-to-right shunt), pulmonary embolism.

2. Capillary

Examples: pulmonary fibrosis, COPD.

3. Post-capillary

Examples: left ventricular failure, mitral valve disease.

4. Miscellaneous

Examples: drugs, sickle-cell anaemia.

Pathophysiology:

Hypoxic vasoconstriction, decreased surface area of pulmonary vascular bed, increased right ventricular volume/pressure.

Signs and symptoms:

According to cause, signs and symptoms of right ventricular failure (eg. peripheral oedema, shortness of breath).

Investigations:

CXR - enlargement of pulmonary arteries. ECG – right ventricular hypertrophy, right atrial enlargement. Echocardiogram – enlarged right ventricle.

Management:

Treat underlying cause. Primary – warfarin, oxygen and calcium channel blockers.

Prognosis:

Mean survival of 2-3 years from diagnosis. Cause of death often right ventricular failure or sudden death.

1 comment:

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