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Causal relation between the pressure gradient and left ventricular ejection time in hypertrophic cardiomyopathy.

Z Sasson¹, M Henderson, S Wilansky

¹Division of Cardiology, Toronto General Hospital, University of Toronto, Ontario, Canada.

Journal of the American College of Cardiology

|May 1, 1989

Summary

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In hypertrophic obstructive cardiomyopathy, left ventricular ejection time directly correlates with the severity of left ventricular outflow obstruction. This relationship is significant, even after heart rate correction, but shows interpatient variability.

Area of Science:

Cardiology
Cardiovascular Physiology

Background:

Hypertrophic obstructive cardiomyopathy (HOCM) is characterized by left ventricular outflow tract (LVOT) obstruction.
Understanding the relationship between LVOT obstruction severity and cardiac function is crucial for patient management.

Purpose of the Study:

To evaluate the direct relationship between the pressure gradient across the LVOT and left ventricular ejection time (LVET) in patients with HOCM.

Main Methods:

Dual catheterization was used to measure LVOT pressure gradients and LVET in 10 HOCM patients.
Pharmacological agents were used to alter the pressure gradient.
Constant atrial pacing was employed to eliminate heart rate variability.

Main Results:

A strong, direct linear correlation was observed between LVET and the pressure gradient in individual patients (mean r=0.97).

Related Experiment Videos

Changes in pressure gradient magnitude directly corresponded to changes in LVET (mean r=0.98).

Pooled data analysis using heart rate correction showed a significant but weaker correlation (r=0.86) due to interpatient variability.

Conclusions:

A clear, direct, and significant relationship exists between LVOT pressure gradient severity and LVET in HOCM.
Interpatient variability in factors like myocardial contractility influences the corrected LVET-gradient relationship.