Sex-based associations with microvascular injury and outcomes after ST-segment elevation myocardial infarction

Annette Marie Maznyczka, David Carrick, Jaclyn Carberry, Kenneth Mangion, Margaret McEntegart, Mark C Petrie, Hany Eteiba, Mitchell Lindsay, Stuart Hood, Stuart Watkins, Andrew Davie, Ahmed Mahrous, Ian Ford, Paul Welsh, Naveed Sattar, Keith G Oldroyd, Colin Berry, Annette Marie Maznyczka, David Carrick, Jaclyn Carberry, Kenneth Mangion, Margaret McEntegart, Mark C Petrie, Hany Eteiba, Mitchell Lindsay, Stuart Hood, Stuart Watkins, Andrew Davie, Ahmed Mahrous, Ian Ford, Paul Welsh, Naveed Sattar, Keith G Oldroyd, Colin Berry

Abstract

Objectives: We aimed to assess for sex differences in invasive parameters of acute microvascular reperfusion injury and infarct characteristics on cardiac MRI after ST-segment elevation myocardial infarction (STEMI).

Methods: Patients with STEMI undergoing emergency percutaneous coronary intervention (PCI) were prospectively enrolled. Index of microcirculatory resistance (IMR) and coronary flow reserve (CFR) were measured in the culprit artery post-PCI. Contrast-enhanced MRI was used to assess infarct characteristics, microvascular obstruction and myocardial haemorrhage, 2 days and 6 months post-STEMI. Prespecified outcomes were as follows: (i) all-cause death/first heart failure hospitalisation and (ii) cardiac death/non-fatal myocardial infarction/urgent coronary revascularisation (major adverse cardiovascular event, MACE) during 5- year median follow-up.

Results: In 324 patients with STEMI (87 women, mean age: 61 ± 12.19 years; 237 men, mean age: 59 ± 11.17 years), women had anterior STEMI less often, fewer prescriptions of beta-blockers at discharge and higher baseline N-terminal pro-B-type natriuretic peptide levels (all p < 0.05). Following emergency PCI, fewer women than men had Thrombolysis in Myocardial Infarction (TIMI) myocardial perfusion grades ≤ 1 (20% vs 32%, p = 0.027) and women had lower corrected TIMI frame counts (12.94 vs 17.65, p = 0.003). However, IMR, CFR, microvascular obstruction, myocardial haemorrhage, infarct size, myocardial salvage index, left ventricular remodelling and ejection fraction did not differ significantly between sexes. Female sex was not associated with MACE or all-cause death/first heart failure hospitalisation.

Conclusion: There were no sex differences in microvascular pathology in patients with acute STEMI. Women had less anterior infarcts than men, and beta-blocker therapy at discharge was prescribed less often in women.

Trial registration number: NCT02072850.

Keywords: MRI; clinical outcomes; index of microcirculatory resistance; microvascular obstruction; myocardial infarction; sex.

Conflict of interest statement

Competing interests: CB: Research Grant—Significant; Based on an institutional agreement with the University of Glasgow, CB has acted as a consultant to Abbott, a manufacturer of diagnostic coronary guidewires. The company has offered a significant research grant in relation to a research project led by CB. The University of Glasgow holds a research agreement with Siemens Healthcare, which manufactured the MRI scanner used in this study. KO: Honoraria—Modest. KO has acted as consultant to Abbott.

Figures

Figure 1
Figure 1
Consort flow diagram of the study. STEMI, ST-segment elevation myocardial infarction.
Figure 2
Figure 2
(A) Kaplan-Meier curve for MACE-free survival, after initial hospitalisation to 5-year follow-up. (B) Kaplan-Meier curve for survival free from all-cause death or the first heart failure hospitalisation to 5-year follow-up. MACE, major adverse cardiovascular event.

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Source: PubMed

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