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Published on: May 8, 2011
Hyperosmotic mannitol and collateral blood flow to ischemic myocardium
G J Vlahakes1, S R Giamber, K O Rothaus
1Department of Surgery (Cardiac Surgical Unit), Massachusetts General Hospital, Boston.
The Journal of Surgical Research
|November 1, 1989
Summary
Hyperosmolar mannitol increases collateral blood flow to ischemic heart regions by dilating large coronary arteries and affecting microcirculation. This improves blood supply during acute ischemia.
Area of Science:
- Cardiovascular Physiology
- Ischemic Heart Disease Research
Background:
- Acute ischemia causes cell swelling, reducing collateral blood flow.
- The effect of hyperosmolality on coronary collateral vascular resistance is not well understood.
Purpose of the Study:
- To investigate the effects of hyperosmolar mannitol on coronary collateral vascular resistance.
- To compare mannitol's effects with nitroglycerin and dipyridamole in an isolated heart model of regional ischemia.
Main Methods:
- Utilized an isolated heart model simulating regional ischemia.
- Administered hyperosmolar mannitol, nitroglycerin, and dipyridamole to assess effects on vascular resistance.
Main Results:
- Mannitol increased collateral blood flow to ischemic regions.
- Hyperosmolality induced dilation of large arterial conductance vessels, similar to nitroglycerin.
- Mannitol also influenced coronary microcirculation, further enhancing collateral blood flow.
Conclusions:
- Hyperosmolar mannitol improves collateral blood flow in ischemic myocardium through both macrovascular and microvascular mechanisms.
- Mannitol offers a potential therapeutic strategy for enhancing blood supply to ischemic heart tissue.
