Pediatricsadvanced
Compare the hemodynamic consequences of mitral regurgitation and mitral stenosis.
Answer
Mitral regurgitation causes backward systolic flow into the left atrium, producing left atrial and left ventricular volume overload; pulmonary congestion and eventual right-sided failure may follow. Mitral stenosis obstructs flow from the left atrium to the left ventricle, increasing left atrial pressure and size and potentially causing pulmonary hypertension and right ventricular dysfunction.
Explanation
The key distinction is **volume overload** from regurgitation versus **flow obstruction and pressure elevation** from stenosis. Both can ultimately cause pulmonary and right-heart complications. **Key takeaway:** The direction of abnormal flow explains the different chamber and pressure changes. **Glossary:** Hemodynamic: relating to blood flow and pressure.
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