Related Experiment Videos
Physiologic considerations in left ventricular hypertrophy
Insights
Left ventricular hypertrophy, a response to high blood pressure, involves structural heart changes and impaired contraction. Factors like age, sex, race, and disease influence its development and regression with treatment.
Area of Science:
- Cardiology
- Hypertension Research
- Cardiovascular Physiology
Background:
- Left ventricular hypertrophy (LVH) is a key indicator of hypertensive vascular disease.
- Increased cardiac mass in hypertension is a structural adaptation to elevated afterload.
- LVH can precede left ventricular failure and contribute to cardiovascular events.
Purpose of the Study:
- To review hemodynamic evidence for the sequence of events in LVH development.
- To identify pathophysiological and clinical factors contributing to increased cardiac mass beyond pressure overload.
- To explore factors influencing the regression of cardiac mass with antihypertensive therapy.
Main Methods:
- Review of hemodynamic evidence.
- Analysis of pathophysiological factors (e.g., pressor mechanisms).
- Consideration of clinical factors (e.g., age, sex, race, comorbidities).
Main Results:
- Hypertension-induced LVH involves initial hyperfunction followed by sustained structural adaptation and impaired contraction.
- Factors beyond pressure overload, including patient demographics and comorbidities, influence LVH development.
- These factors partially explain the regression of cardiac mass observed with antihypertensive treatment.
Conclusions:
- Understanding the transduction of mechanical stimuli into biochemical events is crucial for fully comprehending LVH development and regression.
- Further research is needed to elucidate the molecular mechanisms underlying cardiac adaptation to pressure overload.
- Targeting these mechanisms may lead to more effective treatments for reversing LVH.
Abstract:
Left ventricular hypertrophy is both a target organ response to hypertensive vascular disease as well as a factor that might be responsible for other cardiovascular events. Recent work confirms that the increased cardiac mass associated with hypertension results as a structural adaptation to the increased afterload imposed on the heart. Initially there is a transient period of hyperfunction that is followed by the sustained structural adaptative period of stable hyperfunction. Even before left ventricular failure supervenes, the ventricular mass demonstrates impaired contraction. This article reviews the hemodynamic evidence in favor of this sequence of events but, in addition, points to the pathophysiological and clinical factors that may be responsible for the increased cardiac mass in addition to the pressure overload. These include: the pressor mechanisms per se; the age, sex, and race of the patient; and coexisting diseases. Some of these factors may account in part for the regression of cardiac mass with antihypertensive therapy. However, until we understand more clearly those factors that transduce the physical stimulus for hypertrophy into biochemical events, we shall neither understand completely the development of this structural adaptation of the heart nor its regression with treatment.