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Ventricular hypertrophy--physiological mechanisms.

E M Vaughan Williams

Journal of Cardiovascular Pharmacology

|January 1, 1986

Summary

This summary is machine-generated.

Adult cardiac myocytes cannot divide. This study developed a new model for cardiac hypertrophy in rabbits, finding that adrenergic blockers and other drugs did not inhibit this growth, suggesting potential for new therapies after heart attacks.

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Area of Science:

Cardiology
Physiology
Cell Biology

Background:

Adult cardiac myocytes lack mitotic capacity, necessitating compensatory hypertrophy for recovery after myocardial infarction (MI).
Physiological hypertrophy maintains cellular organization and organelle ratios, whereas pathological hypertrophy can lead to disorganization and impaired function.
Existing models lacked a graded approach to studying cardiac hypertrophy.

Purpose of the Study:

To develop a graded model of cardiac hypertrophy.
To investigate the role of adrenergic stimulation in cardiac hypertrophy.
To assess the effects of beta-blockade and other agents on hypertrophy in this model.

Main Methods:

Simulated high altitude (6,000 m) at sea level using nitrogen/oxygen mixtures in rabbits.

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Administered beta-adrenergic blocking agents, guanethidine, 6-hydroxydopamine, verapamil, and nifedipine.

Quantified right ventricular hypertrophy, left ventricular weight, and hematocrit.

Main Results:

Achieved 50% right ventricular hypertrophy with no change in left ventricular weight or hematocrit.
Induced 100% right ventricular hypertrophy with moderate increases in hematocrit and left ventricular weight upon longer exposure.
Neither beta-blockade nor sympathectomy (guanethidine, 6-hydroxydopamine) affected hypertrophy.
Verapamil and nifedipine treatments also did not impact hypertrophy.

Conclusions:

The simulated high-altitude model provides a graded method for inducing cardiac hypertrophy.
Adrenergic stimulation does not appear to be a necessary stimulus for hypertrophy in this model.
Beta-blockers and other tested agents do not inhibit compensatory cardiac hypertrophy in this rabbit model, suggesting they may not impede recovery after MI.