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Related Experiment Videos

Right ventricular function in severe non-ischaemic mitral insufficiency.

J S Borer1, C Hochreiter, S Rosen

  • 1Cornell University Medical College, New York Hospital, New York, N.Y. 10021.

European Heart Journal
|July 1, 1991
PubMed
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Assessing right ventricular function is crucial in mitral regurgitation. Low right ventricular ejection fraction predicts poor outcomes and mortality, but valve replacement can mitigate risks and improve function.

Area of Science:

  • Cardiology
  • Cardiovascular Surgery
  • Diagnostic Imaging

Background:

  • Mitral insufficiency (regurgitation) affects both ventricles, necessitating evaluation of right ventricular (RV) function.
  • Assessing RV function provides critical pathophysiological insights and clinical value in managing mitral regurgitation.
  • Severe mitral regurgitation poses significant risks, particularly when associated with impaired ventricular function.

Purpose of the Study:

  • To determine the pathophysiological implications of assessing right ventricular function in patients with severe mitral regurgitation.
  • To evaluate the clinical value of right ventricular ejection fraction (RVEF) in predicting outcomes for mitral regurgitation patients.
  • To assess the impact of valve replacement on RV function and patient survival.

Main Methods:

Related Experiment Videos

  • Right ventricular ejection fraction (RVEF) was measured using radionuclide cineangiography in patients with severe, non-ischemic mitral regurgitation.
  • Comparison of RVEF measurements with contrast angiography (r = 0.73, P < 0.01, n = 30).
  • Follow-up of patients treated medically versus those undergoing valve replacement, analyzing survival rates and symptom persistence based on pre-operative RVEF.

Main Results:

  • In medically treated patients with isolated mitral regurgitation, low left ventricular ejection fraction (≤45%) and RVEF (≤30%) were associated with mortality.
  • Valve replacement in isolated mitral regurgitation significantly reduced mortality risk in patients with pre-operative RVEF ≤30% (1 death vs. 5 deaths).
  • In combined mitral and aortic regurgitation, pre-operative exercise RVEF <20% predicted mortality after double valve replacement.
  • Mitral valve replacement led to rapid and sustained improvement in RVEF (average 8% within 1 year, 3% at 3 years).
  • Pre-operative RVEF <30% predicted persistent post-operative symptoms after mitral valve replacement.

Conclusions:

  • Right ventricular ejection fraction is a significant predictor of outcomes in patients with mitral regurgitation.
  • Low RVEF (<30%) identifies patients at high risk for mortality and persistent symptoms, highlighting the need for intervention.
  • Mitral valve replacement effectively mitigates risks associated with low RVEF and improves RV function post-operatively.