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A Simplified Stepwise Approach to Echo Guidance during Percutaneous Mitral Valve Repair
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Impact of valve prosthesis-patient mismatch on pulmonary arterial pressure after mitral valve replacement

Mingzhou Li1, Jean G Dumesnil, Patrick Mathieu

  • 1Research Group in Valvular Heart Diseases, Research Center of Laval Hospital/Quebec Heart Institute, Laval University, 2725 Chemin Saint-Foy, Sainte-Foy, Quebec, Canada G1V 4G5.

Journal of the American College of Cardiology
|April 6, 2005
PubMed
Abstract

Insights

Prosthesis-patient mismatch (PPM) after mitral valve replacement (MVR) significantly increases pulmonary arterial (PA) pressure. Avoiding PPM through careful valve selection can prevent persistent PA hypertension post-MVR.

Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Biomedical Engineering

Background:

  • Pulmonary arterial hypertension (PAH) is a severe complication of mitral valve disease.
  • PAH is a significant risk factor for adverse outcomes following mitral valve replacement (MVR).
  • Prosthesis-patient mismatch (PPM) is hypothesized to contribute to PA hypertension post-MVR.

Purpose of the Study:

  • To investigate the relationship between valve prosthesis-patient mismatch (PPM) and pulmonary arterial (PA) pressure.
  • To assess the impact of PPM on PA pressure after mitral valve replacement (MVR).

Main Methods:

  • Systolic PA pressure was measured using Doppler echocardiography in 56 patients with functioning mitral prosthetic valves.
  • Mitral valve effective orifice area (EOA) was calculated via the continuity equation and indexed to body surface area.
  • PPM was defined as indexed EOA ≤ 1.2 cm²/m².

Main Results:

  • 54% of patients had PA hypertension (systolic PA pressure >40 mm Hg).
  • 71% of patients exhibited PPM.
  • A strong correlation (r=0.64) was observed between systolic PA pressure and indexed EOA.
  • Patients with PPM had significantly higher PA pressure (46±8 mm Hg) and PA hypertension prevalence (68%) compared to those without PPM (34±8 mm Hg, 19%; p<0.001).
  • Indexed EOA was the strongest predictor of systolic PA pressure in multivariate analysis.

Conclusions:

  • Persistent PA hypertension is common after MVR and is strongly linked to PPM.
  • These findings underscore the importance of addressing PPM to improve patient outcomes.
  • Utilizing a prospective strategy during surgery can largely prevent PPM.

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