Effect of Hematologic Parameters on Microvascular Reperfusion in Patients With ST-Segment Elevation Myocardial Infarction Treated With Primary Percutaneous Coronary Intervention

Abstract

Objectives:

Despite the significant role of certain hematologic parameters in reperfusion injury, their relationship with microvascular reperfusion remains not well understood. Therefore, our objective was to evaluate the relationship between hematologic parameters at admission and microvascular reperfusion in patients with ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (primary PCI).

Methods:

A total of 213patients (mean age: 57.5 ± 11 years) with STEMI were included. Blood samples were obtained from all patients prior to primary PCI. Electrocardiographic recordings were made for the evaluation of ST-segment resolution (STR) before and after primary PCI. Angiographic assessment in the infarct-related artery was performed using the myocardial blush grade (MBG) and thrombolysis in myocardial infarction (TIMI) flow. Patients were categorized into 2 groups as those with impaired microvascular reperfusion (STR <70%, TIMI: 0-1, and MBG: 0-1) and those with normal microvascular reperfusion (STR >70%, TIMI: 2-3, and MBG: 2-3).

Results:

Of the overall study group, 139, 105, and 69 patients had an STR of <70%, MBG of 0-1, and TIMI of 0-1, respectively. Demographic parameters in both groups are shown in the tables. Patients with impaired microvascular reperfusion were found to have higher white blood cell (WBC) count, neutrophil count, lymphocyte count, and mean platelet volume (MPV). Neutrophil–lymphocyte ratio and platelet count were similar between the 2 groups. Correlation analysis showed a negative correlation between lymphocyte count and STR (r: −.195, P: .004), lymphocyte count and TIMI flow(r: −.09, P: .14), and lymphocyte count and MBG (r: −.211, P: .002).

Conclusion:

Our results suggest that higher WBC count and MPV at admission are independent predictors of impaired microvascular perfusion in patients with STEMI. On the other hand, a negative correlation was found between lymphocyte count and impaired microvascular perfusion. Specifically, elevated lymphocyte count seemed to indicate the presence of impaired microvascular reperfusion in patients with STEMI.

Keywords

hematologic parameters microvascular reperfusion primary percutaneous coronary intervention myocardial infarction

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