Microvascular obstruction following percutaneous coronary intervention (PCI) is highly prevalent and independently associated with adverse clinical outcomes. Microvascular obstruction is determined by index of the microvascular resistance. We performed a systematic review with meta-analysis of all published randomized clinical trials (RCTs) studying the effect of intra-coronary thrombolysis with PCI as compared to standard treatment among patients with ST-segment elevated myocardial infarction. We included 6 RCTs summing up to 947 patients in the final analysis. Intra-coronary thrombolysis resulted in significantly lower index of microvascular resistance [standardized mean difference: − 13.74, 95% confidence interval (CI): − 16.74 to − 10.73, P value < 0.001, I2 = 0%]. There was no difference noted in the occurrence of major adverse cardiac events with intra-coronary thrombolysis as compared to standard treatment [Odds ratio: 0.71, 95% CI: 0.46–1.08, P value = 0.11, I2 = 0%]. The absence of heterogeneity deferred us from using dose–response analysis to account for altering dose used across studies. The results of the present meta-analysis highlights the role of intra-coronary thrombolysis in reducing microvascular obstruction. No effect of intra-coronary thrombolysis was noted on the occurrence of major adverse cardiac events.
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Kumar, A., Shariff, M. & Doshi, R. Index of microvascular resistance and outcomes following intra-coronary thrombolysis with percutaneous intervention in STEMI: a meta-analysis of randomized control trials. J Thromb Thrombolysis (2020). https://doi.org/10.1007/s11239-020-02063-1
- Intra-coronary thrombolysis
- Microvascular obstruction
- Index of microvascular resistance