The Frequency of Early Subacute Stent Thrombosis after Primary Percutaneous Coronary Intervention in Patients with St-Segment Elevation Myocardial Infarction

Abstract

Introduction: Acute coronary syndrome(ACS) is associated with activation ofplateletsand thecoagulationsystem which could influence the incidence of early stentthrombosis(EST).Stent thrombosis is a relatively uncommon phenomenon, yet it is a serious complication which often presents as an ST-segment elevation myocardial infarction (STEMI) and/or sudden cardiac death1,2.Stent thrombosis (ST) is an uncommon but life-threatening complication after percutaneous coronary intervention (PCI), frequently manifesting as acute coronary syndrome (ACS) or even cardiac death.Platelet activation and the heightening of the coagulation system play a major role in the pathogenesis of acute coronary syndrome (ACS) and might impact the occurrence of stent thrombosis in those patients who undergo stenting during ACS. Unfortunately, stent thrombosis (ST) is more frequent after stenting for STEMI than after elective stenting with both drug-eluting stents (DES) and baremetal stents (BMS). Objective: To determine the frequency of early subacute stent thrombosis after primary percutaneous coronary intervention in patients with STsegment elevation myocardial infarction Methodology: Study Design: Descriptive Case Series Setting: This study was conducted in NICVD Hospital, Karachi Subjects and Methods: Study was approved by hospital ethical review committee. All patients who fulfilled the inclusion criteria were included in the study. Pre-operatively a written consent was taken from each patient by the primary investigator of this study. All these patients were undergone primary PCI and stent either drug-eluting stents (coated with medication) or bare-metal stent was placed. These patients were observed for 24 hours for early subacute stent thrombosis. All the collected data were entered into the proforma attached at the end. Results: Mean ± SD of age was 55.56±12.24 with C.I (53.52------57.59) years. Mean ± SD duration of surgery was 33.48±9.26 with C.I (31.90------35.05) minutes. Out of 142 patients 103 (72.53%) were male and 39 (27.4%) were female. Frequency of early subacute stent thrombosis was found to be 4(2.82%). Conclusion: It is to be concluded that frequency of early acute stent thrombosis after primary PCI was found to be 2.82%.Patients presenting with STEMI who are hemodynamically unstable and have multivessel coronary disease undergoing coronary stenting during ACS, are at increased risk of EST. Keywords: Acute myocardial Infarction, Primary PCI, Early Subacute Stent, Thrombosis, STEMI