What is the pulmonary artery pressure in severe mitral stenosis?

Study for the Echocardiography Techniques II Exam 2. Equip yourself with flashcards and multiple choice questions, each question comes with hints and explanations to prepare you for the test.

Multiple Choice

What is the pulmonary artery pressure in severe mitral stenosis?

Explanation:
When mitral stenosis is severe, left atrial pressure becomes markedly elevated and is transmitted backward into the pulmonary circulation. This causes pulmonary venous congestion and, over time, reactive changes in the pulmonary vasculature, all of which raise the pulmonary artery systolic pressure. In the setting of severe MS, PASP is typically significantly elevated, most commonly exceeding 50 mmHg, which is why the best answer is a value greater than 50 mmHg. In practice, echocardiography estimates PASP from the tricuspid regurgitant jet (PASP ≈ 4(TRV)^2 + estimated RA pressure). Normal PASP is much lower, so a value above about 50 mmHg signals substantial pulmonary hypertension linked to severe mitral stenosis.

When mitral stenosis is severe, left atrial pressure becomes markedly elevated and is transmitted backward into the pulmonary circulation. This causes pulmonary venous congestion and, over time, reactive changes in the pulmonary vasculature, all of which raise the pulmonary artery systolic pressure. In the setting of severe MS, PASP is typically significantly elevated, most commonly exceeding 50 mmHg, which is why the best answer is a value greater than 50 mmHg. In practice, echocardiography estimates PASP from the tricuspid regurgitant jet (PASP ≈ 4(TRV)^2 + estimated RA pressure). Normal PASP is much lower, so a value above about 50 mmHg signals substantial pulmonary hypertension linked to severe mitral stenosis.

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