Why the study?
The study was conducted to evaluate the short-term impact of ischaemic postconditioning on myocardial injury in STEMI using surrogate cardiac biomarkers.
Does ischemic postconditioning reduce myocardial injury as measured by peak cardiac biomarkers in STEMI patients undergoing primary PCI?
Meta-Analysis (n=1,273)
Does ischemic postconditioning reduce myocardial injury as measured by peak cardiac biomarkers in STEMI patients undergoing primary PCI?
Answers are grounded in this paper and cite their sources.
Ischemic postconditioning during primary PCI for STEMI does not significantly reduce myocardial injury as measured by peak CK and CK-MB, though linear regression suggests a potential benefit in smokers.
OBJECTIVES: This study aimed to perform a meta-analysis of the short-term impact of ischaemic postconditioning (IPoC) on myocardial injury in ST elevation myocardial infarction (STEMI) using surrogate cardiac biomarkers. METHODS: Eligible studies were identified using several article databases. Randomised controlled trials published between 1 January 2000 and 1 December 2021 comparing IPoC to standard of therapy in STEMI patients were included in the search. Outcomes included surrogates of myocardial injury, specifically peak troponin, creatine-kinase (CK) and CK myoglobin binding (CK-MB) enzyme levels. RESULTS: 11 articles involving 1273 patients reported on CK-MB and 8 studies involving 505 patients reported on CK. Few studies used troponin as an outcome, thus, a subanalysis of troponin dynamics was not performed. Meta-regression analysis demonstrated no significant effect of IPoC on peak CK-MB (effect size -0.41, 95% CI -1.15 to 0.34) or peak CK (effect size -0.42, 95% CI -1.20 to 0.36). Linear regression analysis demonstrated a significant correlation between a history of smoking and CK-MB in the IPoC group (p=0.038). CONCLUSIONS: IPoC does not seem to protect against myocardial injury in STEMI, except possibly in smokers. These results resonate with some studies using imaging techniques to ascertain myocardial damage. More research using troponin and cardiac imaging should be pursued to better assess the effects of IPoC on cardiovascular outcomes in STEMI.
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Bergman et al. (2024) conducted a meta-analysis in ST-elevation myocardial infarction (STEMI) (n=1,273). Ischaemic postconditioning (IPoC) vs. Standard percutaneous coronary intervention was evaluated on Peak CK-MB levels (effect size -0.41, 95% CI -1.15 to 0.34).
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