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Three-Vessel Assessment of Coronary Microvascular Dysfunction in Patients With Clinical Suspicion of Ischemia: Prospective Observational Study With the Index of Microcirculatory Resistance

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Author(s)
Yuhei KobayashiJoo Myung LeeWilliam F. FearonJang Hoon LeeTakeshi NishiDong-Hyun ChoiFrederik M. ZimmermannJi-Hyun JungHyun-Jung LeeJoon-Hyung DohChang-Wook NamMDEun-Seok ShinBon-Kwon Koo,
Keimyung Author(s)
Nam, Chang Wook
Department
Dept. of Internal Medicine (내과학)
Journal Title
Circulation
Issued Date
2017
Volume
10
Issue
11
Keyword
coronary artery diseaseischemialogistic modelmicrocirculationobservational study
Abstract
BACKGROUND:

Difficulty directly visualizing the coronary microvasculature as opposed to the epicardial coronary artery makes its assessment challenging. The goal of this study is to measure the index of microcirculatory resistance (IMR) in all 3 major coronary vessels to identify the clinical and angiographic predictors of an abnormal IMR.

METHODS AND RESULTS:

Ninety-three patients who underwent coronary physiological assessment in all 3 major coronary vessels were prospectively enrolled (59.8±9.4 years with 77.4% men). IMR was corrected using Yong's formula and coronary microvascular dysfunction (CMD) was defined using vessel-specific cutoffs. A global IMR was calculated as the sum of the IMR in all 3 major epicardial vessels. Angiographic epicardial disease severity was assessed with vessel-specific and overall SYNTAX score. Median IMR and fractional flow reserve was 17.2 (Q1-Q3: 13.3-22.9) and 0.92 (0.85-0.97). The majority of patients (59.1%) had no CMD, 23.7% had 1-vessel CMD, 14.0% had 2-vessel CMD, and 3.2% had 3-vessel CMD. CMD was observed at a similar rate in the territories supplied by all 3 major coronary vessels (left anterior descending coronary artery 28.0%, left circumflex artery 19.4%, and right coronary artery 23.7%; P=0.39). Fractional flow reserve had a weak, positive correlation with IMR (ρ=0.16; P<0.01). The SYNTAX score had no significant correlation with IMR, both at a patient level (ρ=-0.002; P=0.99) and a vessel-specific level (ρ=-0.06; P=0.36). By multivariable ordinal logistic regression analysis, no variable was left as an independent predictor of an abnormal IMR.

CONCLUSIONS:

Clinical factors and epicardial coronary disease severity are not predictors of the extent of CMD.
Keimyung Author(s)(Kor)
남창욱
Publisher
School of Medicine (의과대학)
Citation
Yuhei Kobayashi et al. (2017). Three-Vessel Assessment of Coronary Microvascular Dysfunction in Patients With Clinical Suspicion of Ischemia: Prospective Observational Study With the Index of Microcirculatory Resistance. Circulation, 10(11), e005445–e005445. doi: 10.1161/CIRCINTERVENTIONS.117.005445
Type
Article
ISSN
1941-7640
DOI
10.1161/CIRCINTERVENTIONS.117.005445
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/41549
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Internal Medicine (내과학)
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