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Patient-prosthesis mismatch following aortic valve replacement.

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Patient-prosthesis mismatch (PPM) after aortic valve replacement (AVR) is common, with severe PPM impacting mortality. Prevention is key, as re-intervention for PPM carries significant risks.

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Area of Science:

  • Cardiovascular Surgery
  • Prosthetic Valve Dynamics
  • Medical Device Performance

Background:

  • Patient-prosthesis mismatch (PPM) is a critical issue post-aortic valve replacement (AVR), defined by an inadequate prosthetic valve size relative to patient body surface area.
  • Severe PPM (indexed effective orifice area <0.65 cm²/m²) is linked to adverse outcomes, though its precise role is debated.

Purpose of the Study:

  • To review the current literature on PPM prevalence, outcomes, and management strategies following AVR over the last decade.
  • To identify predictors of PPM and discuss diagnostic criteria and treatment options.

Main Methods:

  • Systematic review of studies published within the past 10 years focusing on PPM after AVR.
  • Analysis of data regarding PPM prevalence, associated risk factors, clinical outcomes, and management approaches.

Main Results:

  • PPM prevalence varies widely (8-80%), with severe PPM occurring in 10-15% of cases and potentially impacting mortality.
  • PPM is associated with increased perioperative stroke, renal failure, and impaired left ventricular mass regression.
  • Predictors include female sex, older age, comorbidities (hypertension, diabetes, renal failure), and higher surgical risk scores.

Conclusions:

  • PPM, particularly severe PPM, warrants attention post-AVR, though it may reflect underlying comorbidities.
  • Diagnosis relies on clinical symptoms, elevated gradients, and small effective orifice area, with re-intervention reserved for persistent, symptomatic cases.
  • Prevention through appropriate valve selection is paramount, as redo surgery for PPM is complex and carries risks.