Key result
Hyperemic microvascular resistance was higher in arteries with more severe stenosis and decreased significantly after angioplasty (2.6 vs. 1.9 mmHg.cm-1s-1; P<0.01).
Why the study?
Does the severity of epicardial stenosis affect distal microvascular resistance, and does PTCA normalize it in patients with coronary artery disease?
Observational (n=27)
Does the severity of epicardial stenosis affect distal microvascular resistance, and does PTCA normalize it in patients with coronary artery disease?
Absolute Event Rate: 1.9% vs 2.6%
p-value: p=<0.01
Coronary lesion severity is positively associated with distal microvascular resistance, which normalizes after angioplasty, challenging the assumption of uniform hyperemic microvascular resistance distribution.
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May increase distal microvascular resistance in severe stenosis; challenges uniform resistance assumption and leaves open need for prospective trials.
Chamuleau et al. (2003) conducted an observational in Coronary artery disease and stable angina (n=27). Percutaneous transluminal coronary angioplasty (PTCA) vs. Pre-PTCA and reference artery was evaluated on Hyperemic microvascular resistance (MRv) (p=<0.01). Hyperemic microvascular resistance was higher in arteries with more severe stenosis and decreased significantly after angioplasty (2.6 vs. 1.9 mmHg.cm-1s-1; P<0.01).
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