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Venodilation
6%
13/210
Microvessel dilation
38%
80/210
Dilation of the large coronary arteries
31%
65/210
Arterial dilation
21%
44/210
Volume loss of fluid in the periphery
1%
2/210
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Microvessel dilation is responsible for the coronary steal phenomenon in the acute setting. Ischemic vessels are often maximally dilated, and dilation of coronary microvessels to non-ischemic tissues can in the acute setting divert blood flow from already dilated ischemic vessels to newly dilated, adequately perfused microvessels, worsening ischemia. Dipyridamole is classically associated with the coronary steal phenomenon. Incorrect Answers: Answers 1, 3, 4, 5: These vessels are not responsible for the coronary steal phenomenon.
1.6
(17)
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