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Peripheral vascular alterations during experimental heart failure in the rat. Do they exist?
S Heeneman1, P J Leenders, P J Aarts
1Department of Pathology, Cardiovascular Research Institute Maastricht, University of Limburg, Netherlands.
Arteriosclerosis, Thrombosis, and Vascular Biology
|September 1, 1995
Summary
Heart failure in rats alters peripheral blood vessel structure, causing large arteries to shrink and smaller resistance arteries to widen over time. These changes in vascular remodeling are linked to heart damage severity.
Area of Science:
- Cardiovascular Physiology
- Vascular Biology
- Heart Failure Research
Background:
- Peripheral vascular structural changes are implicated in hypertension and atherosclerosis.
- Previous research has suggested, but not confirmed, these changes occur in heart failure.
- This study investigates peripheral vascular alterations in an experimental heart failure model.
Purpose of the Study:
- To investigate structural changes in peripheral arteries and arterioles following myocardial infarction (MI) in rats.
- To determine if these vascular changes correlate with the severity and duration of heart failure.
- To characterize alterations in vessel dimensions, collagen, and elastin content.
Main Methods:
- Induction of heart failure via left coronary artery ligation in rats, with sham-operated controls.
- Excision and morphometric analysis of large conduit and resistance arteries at multiple time points (1, 3, 5, 12 weeks post-MI).
- Biochemical assays for collagen and elastin content, and measurement of peripheral tissue blood flow.
Main Results:
- No significant vessel dimension changes were observed at early time points post-MI.
- Twelve weeks after MI, conduit arteries (aorta, carotid, mesenteric) showed significantly reduced cross-sectional area (CSA) and diameters.
- Resistance arteries (mesenteric, pulmonary) exhibited increased internal and external diameters 12 weeks post-MI, proportional to infarct size.
Conclusions:
- Experimental heart failure induces significant structural remodeling in the peripheral vasculature.
- Conduit arteries undergo constriction, while resistance arteries dilate, suggesting adaptive or maladaptive vascular responses to chronic heart failure.
- These findings highlight the systemic impact of heart failure on vascular structure and function.