Relationship between Hemoglobin Concentration at Admission with the Incidence of No-Reflow Phenomenon and In-Hospital Mortality in Acute Myocardial Infarction with Elevation of ST Segments in Patients who underwent Primary Percutaneous Coronary Intervention.

Anemia in acute ST-segment elevation myocardial infarction (STEMI) is associated with a pro-coagulant state, contributing to the incidence of no-reflow phenomenon and increased mortality following primary percutaneous coronary intervention (PPCI). However, clinical data remain contradictory. The objective of our study was to evaluate the association of admission hemoglobin (Hb) concentration and in-hospital mortality of STEMI patients' post-PPCI, as well as final thrombolysis in myocardial infarction (TIMI) flow. A cross-sectional study was performed from the database of Jakarta Acute Coronary Syndrome Registry, consisting of 3,071 STEMI patients who underwent PPCI between January 2014 and December 2019. No-reflow phenomenon was defined as final TIMI flow <3 of the infarct-related artery. Outcome measures were the occurrence of no-reflow and in-hospital mortality. Anemia criteria were based on the World Health Organization. Anemia was found in 550 patients (17.9%). Patients with anemia were older (60 ± 10 years, p  < 0.001), predominantly women (20.7 vs. 11.2%, p  < 0.001), TIMI risk score >4 (45.8 vs. 30.4%, p  < 0.00), and Killip classification >1 (25.8 vs. 20.8%, p  < 0.009). Anemia at admission was not associated with no-reflow phenomenon (odds ratio [OR] = 0.889; 95% confidence interval [CI] = 0.654-1.209, p  = 0.455). Multivariate regression models showed that anemia was not associated with in-hospital mortality (OR = 0.963; 95% CI = 0.635-1.459, p  = 0.857) and with no-reflow phenomenon (OR = 0.939; 95% CI = 0.361-2.437, p  = 0.896). Anemia upon admission was not related to the no-reflow phenomena or in-hospital mortality in STEMI patients undergoing PPCI.