PROCEDURAL ANALYSIS OF PATIENTS WITH STENT THROMBOSIS (ST)

Stent Thrombosis (ST)

Abstract

Objective: To analyze the procedural details of patients presenting as ST and undergoing PCI.
Study Design: Descriptive study.
Place and Duration of Study: Armed Forces Institute of Cardiology – National Institute of Heart Diseases (AFIC-NIHD) from Jan 2007 to Dec 2010.
Patients and Methods: A descriptive, single center study done at AFIC Rawalpindi from Jan 2007 to Dec 2010. During this period patients with prior stenting who presented to AFIC E/R with acute ischaemic symptoms with ECG changes and had angiographically confirmed ST were studied. Their procedural details (index PCI and ST procedure) were analyzed.
Results: Over this four year study period, 7694 coronary angioplasties were carried out and 12871 stents (10633 DES and 2238 BMS) were implanted. Amongst these, 32 patients (28 males and 4 females) later had angiographically confirmed ST and were treated with PCI. Mean age was 51.57 years. Dual antiplatelet therapy (DAPT) non-compliance was not a contributory factor in our study. Coronary distribution involved in ST included 20 cases of LAD, 7 of LCX and 5 of RCA territory. Thirteen (40%) patients had overlapping stents, 11 (34.4%) had direct stenting. Average diameter of stents with ST was 2.86 mm and the average length was 24.17 mm. Incidence of ST was higher in BMS as compared to DES (p0.003). Of these 32 patients, 14 (43.75%) were treated with further stenting whereas 18 (56.25%) underwent POBA only. Telephonic follow up after second PCI was possible in only 15 cases, out of which five (33.33%) deaths were reported on the day of thrombotic procedure.
Conclusion: ST has a high mortality and there was an overall higher frequency of ST in BMS compared to DES. Acute and subacute ST were mainly related to BMS whereas late ST was more common in DES. However PCI technique i.e direct stenting and overlapping stents, was a major predictor of stent thrombosis.