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Left ventricular hypertrophy regression as a process with variable biological implications
1Department of Pathophysiology, Medical Faculty, Bratislava, Slovak Republic.
Insights
Myocardial hypertrophy regression varies in nature and biological implications. Different forms of regression, like athletic versus pathological, have distinct outcomes, requiring further study to assess cardiovascular risk reduction.
Area of Science:
- Cardiovascular Physiology
- Pathology
- Medical Research
Background:
- Left ventricular myocardial hypertrophy can have detrimental effects, increasing risks of heart failure, myocardial infarction, and sudden death.
- The character of hypertrophic growth influences the risk of adverse cardiovascular events.
- Reversing cardiac mass to normal does not guarantee complete normalization of ventricular function or health.
Purpose of the Study:
- To investigate if myocardial hypertrophy regression is a variable process with diverse biological implications, similar to hypertrophy itself.
- To differentiate between various forms of left ventricular hypertrophy regression and their associated outcomes.
Main Methods:
- Conducted comprehensive literature searches of Current Contents and MEDLINE databases.
- Included human and animal studies published between 1969 and 1994, analyzing 89 relevant articles.
Main Results:
- Distinguished several forms of left ventricular hypertrophy regression.
- Identified physiological regression in athletic hearts versus pathological regression in models of aortic insufficiency, leading to heart failure.
- Therapeutically induced regression's nature depends on fibrosis, energy state, and heart function.
Conclusions:
- The biological implications of hypertrophy regression are contingent upon the initial nature of the hypertrophy and the method used for mass reversal.
- Long-term prospective studies are essential to determine which regression types effectively decrease cardiovascular risk.
Objective:
To determine whether myocardial hypertrophy regression, similarly to hypertrophy itself, is a process of variable nature with different biological implications.
Data Sources:
Current Contents and MEDLINE searches under myocardial hypertrophy and regression of hypertrophy-related headings were conducted.
Data Extraction:
The search covered the period from 1969 to 1994, and 89 articles dealing with both human and animal studies were used.
Data Synthesis:
The positive adaptive effect of left ventricular myocardial hypertrophy may be counterbalanced by increased incidence of heart failure, myocardial infarction or sudden death. The risk of undesirable cardiovascular events varies according to the character of hypertrophic growth. Reduction of cardiac mass to that of a normal heart need not always mean that the ventricle is normal in all aspects. Several forms of left ventricular hypertrophy regression may be distinguished. The hypertrophy regression of the athletic heart is of a physiological nature. The spontaneous regression of left ventricular hypertrophy as seen in the rabbit model of aortic insufficiency has a pathological aspect resulting in heart failure. The nature of therapeutically induced regression of hypertrophy may vary according to fibrotic tissue concentration, energetical state and the function of the regressed heart.
Conclusion:
The biological implication of hypertrophy regression varies especially with respect to the nature of hypertrophy and the mode of achievement of hypertrophied mass reversal. Only long term prospective studies can clarify the question as to which types of hypertrophy regression result in decreased cardiovascular risk.