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Relation of left ventricular chamber stiffness at rest to exercise capacity in hypertrophic cardiomyopathy

Carlos Alberto Dumont1, Lorenzo Monserrat, Jesús Peteiro

  • 1Cardiology Division, Juan Canalejo Hospital, A Coruña, Spain.

The American Journal of Cardiology
|May 12, 2007
PubMed

Insights

Left ventricular (LV) chamber stiffness, a measure of diastolic dysfunction, significantly impacts exercise capacity in hypertrophic cardiomyopathy (HC) patients. Increased LV stiffness is a key predictor of reduced exercise tolerance in HC.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Biomedical Engineering

Background:

  • Conventional markers inadequately predict exercise capacity in hypertrophic cardiomyopathy (HC).
  • Exercise intolerance in HC is primarily linked to impaired left ventricular (LV) stroke volume augmentation due to diastolic dysfunction.
  • The impact of noninvasively assessed LV chamber stiffness on exercise tolerance in HC remains unclear.

Purpose of the Study:

  • To investigate the relationship between LV chamber stiffness and exercise capacity in patients with HC.
  • To determine if LV chamber stiffness is a significant determinant of maximal exercise tolerance in HC.

Main Methods:

  • Sixty-four HC patients underwent Doppler echocardiography, exercise testing, and cardiac magnetic resonance.
  • LV chamber stiffness index calculated as pulmonary capillary wedge pressure (from E/Ea ratio) divided by LV end-diastolic volume (from CMR).
  • Maximal exercise tolerance measured by achieved METs.

Main Results:

  • Maximal exercise capacity (METs) inversely correlated with age, heart rate deficit, LV outflow tract gradient, E/Ea ratio, LV wall thickness, and LV stiffness.
  • LV stiffness showed the strongest inverse correlation with METs achieved (r = -0.56, p <0.001).
  • Multivariate analysis identified LV chamber stiffness as the sole independent predictor of exercise capacity; a threshold of 0.18 mm Hg/ml predicted METs ≤7 with 100% sensitivity and 75% specificity.

Conclusions:

  • Increased LV chamber stiffness, reflecting resting LV diastolic dysfunction, is a primary determinant of maximal exercise capacity in HC patients.
  • Noninvasive assessment of LV chamber stiffness offers valuable prognostic information regarding exercise tolerance in HC.
  • Targeting LV diastolic dysfunction may improve exercise capacity in hypertrophic cardiomyopathy.

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