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Effect of left ventricular outflow tract obstruction on clinical outcome in hypertrophic cardiomyopathy

Martin S Maron1, Iacopo Olivotto, Sandro Betocchi

  • 1Division of Cardiology, Tufts-New England Medical Center, Boston, USA.

The New England Journal of Medicine
|January 24, 2003
PubMed

Insights

Left ventricular outflow tract obstruction in hypertrophic cardiomyopathy significantly increases the risk of death and severe heart failure symptoms. This finding highlights the importance of identifying and managing this obstruction for improved patient outcomes.

Area of Science:

  • Cardiology
  • Internal Medicine
  • Clinical Research

Background:

  • Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
  • The impact of left ventricular outflow tract obstruction (LVOTO) on HCM outcomes is not fully understood.
  • Clarifying the role of LVOTO is crucial for patient management.

Purpose of the Study:

  • To investigate the influence of resting left ventricular outflow tract obstruction on morbidity and mortality in patients with hypertrophic cardiomyopathy.
  • To determine if LVOTO is an independent predictor of adverse clinical outcomes in HCM.

Main Methods:

  • A large cohort of 1101 consecutive patients with hypertrophic cardiomyopathy was assessed.
  • Patients were followed for a mean of 6.3 years.
  • The study evaluated the association between LVOTO (peak instantaneous gradient ≥30 mm Hg at rest) and clinical outcomes, including death and heart failure progression (New York Heart Association class III or IV).

Main Results:

  • 273 patients (25%) had resting LVOTO.
  • Patients with LVOTO had a significantly higher probability of death related to HCM (RR, 2.0; P=0.001).
  • LVOTO was independently associated with increased risk of death or progression to severe heart failure (RR, 1.6-2.7; P<0.02), particularly in patients ≥40 years old.

Conclusions:

  • Resting left ventricular outflow tract obstruction is a significant, independent predictor of adverse outcomes in hypertrophic cardiomyopathy.
  • LVOTO is associated with a higher risk of death and progression to severe heart failure.
  • These findings underscore the clinical importance of identifying and addressing LVOTO in HCM patients.
Abstract

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