Key result
IMR after primary PCI strongly correlates with peak CK and 3-month WMS in STEMI.
Why the study?
Despite adequate epicardial reperfusion, many STEMI patients have poor outcomes due to microvascular damage, and assessing microvascular status remains challenging.
Does the index of microcirculatory resistance (IMR) predict microvascular damage and left ventricular function recovery better than standard measures in patients undergoing primary PCI for STEMI?
Population
29 patients after primary PCI for STEMI
Comparison
IMR vs TIMI myocardial perfusion grade, frame count, CFR, and ST-segment resolution
Design
Observational cohort study
Follow-up
3 months
Authors
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IMR may better identify microvascular injury and poorer LV recovery after STEMI PCI; leaves open whether measurement should guide therapy.
Observational (n=29)
Does the index of microcirculatory resistance (IMR) predict microvascular damage and left ventricular function recovery better than standard measures in patients undergoing primary PCI for STEMI?
Effect estimate: R 0.61 for peak CK; R 0.59 for WMS
p-value: p=0.0005 for peak CK; 0.002 for WMS
IMR measured after primary PCI for STEMI is a strong predictor of acute microvascular damage and short-term left ventricular functional recovery, outperforming standard measures.
Fearon et al. (2008) conducted an observational in ST-segment elevation myocardial infarction (STEMI) (n=29). Index of microcirculatory resistance (IMR) vs. Standard measures of microvascular dysfunction was evaluated on Peak creatinine kinase (CK) and 3-month echocardiographic wall motion score (WMS) (R 0.61 for peak CK; R 0.59 for WMS, p=0.0005 for peak CK; 0.002 for WMS). Index of microcirculatory resistance significantly correlated with peak creatinine kinase (R=0.61, p=0.0005) and 3-month wall motion score (R=0.59, p=0.002) in STEMI patients after primary PCI.
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