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DM Cardiology EE Mcq Of The Day

Question: Regarding Coronary Flow Reserve
1. Absolute flow reserve is the ratio of coronary flow during maximal vasodilation to the resting value
2. Relative flow reserve compares maximal vasodilated flow in a stenotic region with an assumed normal region in the same heart
3. Fractional flow reserve assesses maximal flow indirectly from coronary pressure measurements distal to a stenosis during vasodilation
4. Fractional flow reserve can identify the contribution of abnormalities in microcirculatory resistance to the development of myocardial ischemia
A) Only 1, 2 and 3 are correct
B) Only 1 and 3 are correct
C) Only 2 and 4 are correct
D) Only 4 is correct