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Review Question - QID 100720

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QID 100720 (Type "100720" in App Search)
In the coronary steal phenomenon, vessel dilation is paradoxically harmful because blood is diverted from ischemic areas of the myocardium. Which of the following is responsible for the coronary steal phenomenon?

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.

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