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[Right ventricular dysfunction of mitral valve stenosis].

I Taniguchi1

  • 1Second Department of Surgery, Tottori University Medical School, Yonago, Japan.

[Zasshi] [Journal]. Nihon Kyobu Geka Gakkai
|July 1, 1990
PubMed
Summary

Mitral valve replacement (MVR) patients show reduced right ventricular ejection fraction (RVEF) due to increased pulmonary vascular resistance, not intrinsic right ventricular dysfunction. This persistent afterload impacts right heart function post-surgery.

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Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Pulmonary Hypertension

Context:

  • Mitral valve stenosis (MVS) often leads to pulmonary hypertension and right ventricular (RV) dysfunction.
  • Mitral valve replacement (MVR) aims to restore cardiac function, but RV performance post-MVR requires further investigation.

Purpose:

  • To evaluate right ventricular (RV) function and pulmonary hemodynamics in patients after mitral valve replacement (MVR) for mitral valve stenosis.
  • To differentiate between RV contractile dysfunction and increased afterload as causes of impaired RV function post-MVR.

Summary:

  • Right ventricular ejection fraction (RVEF) was significantly lower at rest in MVR patients compared to controls.
  • Despite similar right ventricular systolic pressure/end-systolic volume index (RVSP/ESVI) at rest, MVR patients exhibited higher total pulmonary resistance index (TPRI) and mean pulmonary arterial pressure (mPAP).
  • During exercise, RVEF increased in controls but not in MVR patients, who also showed further increases in TPRI and mPAP, indicating persistent pulmonary vascular resistance.

Impact:

  • Post-MVR low RVEF is primarily attributed to elevated afterload from irreversible pulmonary vascular resistance, not RV contractile failure.
  • Findings highlight the chronic impact of pulmonary hypertension on RV function even after successful MVR.
  • Suggests that managing pulmonary vascular resistance is crucial for improving RV performance in MVR patients.

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