Key result
Preloading third-generation P2Y12 inhibitors is linked to lower IMR, indicating microvascular dysfunction prevention.
Why the study?
Microvascular dysfunction after STEMI correlates with infarct size and poor long-term prognosis, but therapeutic strategies that can reliably reduce it remain uncertain.
Do specific mechanical and pharmacological revascularization strategies reduce the index of microcirculatory resistance in STEMI patients undergoing primary PCI?
Observational (n=160)
Do specific mechanical and pharmacological revascularization strategies reduce the index of microcirculatory resistance in STEMI patients undergoing primary PCI?
Effect estimate: β = -10.30
p-value: p=<0.001
Preloading with third-generation P2Y12 inhibitors is associated with reduced microvascular dysfunction in STEMI patients undergoing primary PCI, whereas post-dilation may increase it.
May support preloading third-generation P2Y12 inhibitors to limit microvascular injury in STEMI PCI; hypothesis-generating and requires randomized confirmation.
Objectives. We aimed to identify mechanical and pharmacological revascularization strategies correlated with the index of microcirculatory resistance (IMR) in ST-elevation myocardial infarction (STEMI) patients. Background. Microvascular dysfunction (MVD) after STEMI is correlated with infarct size and poor long-term prognosis, and the IMR is a useful analytical method for the quantitative assessment of MVD. However, therapeutic strategies that can reliably reduce MVD remain uncertain. Methods. Patients with STEMI who underwent primary percutaneous coronary intervention (PCI) were enrolled. The IMR was measured with a pressure sensor/thermistor-tipped guidewire immediately after primary PCI. High IMR was defined as values ≥66th percentile of IMR in enrolled patients (IMR > 30.9 IU). Results. A total of 160 STEMI patients were analyzed (high IMR = 54 patients). Clinical factors for Killip class P=0.006 , delayed hospitalization from symptom onset P=0.004 , peak troponin-I level P=0.042 , and multivessel disease P=0.003 were associated with high IMR. Achieving final thrombolysis in myocardial infarction myocardial perfusion grade 3 tended to be associated with low IMR P=0.119 , whereas the presence of distal embolization was significantly associated with high IMR P=0.034 . In terms of therapeutic strategies that involved adjusting clinical and angiographic factors associated with IMR, preloading of third-generation P2Y12 inhibitors correlated with reducing IMR value (β = −10.30, P<0.001 ). Mechanical therapeutic strategies including stent diameter/length, preballoon dilatation, direct stenting, and thrombectomy were not associated with low IMR value (all P>0.05 ), and postballoon dilatation was associated with high IMR (β = 8.30, P=0.020 ). Conclusions. In our study, mechanical strategies were suboptimal in achieving myocardial salvage. Preloading of third-generation P2Y12 inhibitors revealed decreased IMR value, indicative of MVD prevention.
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Jang et al. (2020) conducted an observational in ST-elevation myocardial infarction (STEMI) (n=160). Preloading of third-generation P2Y12 inhibitors was evaluated on Index of microcirculatory resistance (IMR) (β = -10.30, p=<0.001). Preloading of third-generation P2Y12 inhibitors was associated with a reduced index of microcirculatory resistance (β = -10.30, P<0.001), indicative of microvascular dysfunction prevention.
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