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Predictors of stent thrombosis after primary stenting for acute myocardial infarction
Insights
Patients with acute myocardial infarction who received stents faced a higher risk of stent thrombosis, particularly if they had diabetes or were smokers. These factors, along with stent number and vessel diameter, predict thrombosis risk.
Area of Science:
- Cardiology
- Interventional Cardiology
- Thrombosis Research
Background:
- A hypercoagulable state may persist post-myocardial infarction, potentially increasing stent thrombosis risk.
- Previous studies have not consistently linked diabetes or smoking to stent thrombosis.
Purpose of the Study:
- To investigate the incidence of stent thrombosis after primary stenting in acute myocardial infarction patients.
- To identify predictors of stent thrombosis in this patient population.
Main Methods:
- 104 patients with acute myocardial infarction underwent primary stenting with 147 coronary stents.
- Data collected included patient demographics, procedural details, and clinical outcomes.
- Multivariate analysis was used to identify independent predictors of stent thrombosis.
Main Results:
- Stent thrombosis occurred in 5.7% of patients within 1 month, with 5 of 6 experiencing reinfarction.
- Independent predictors of stent thrombosis included diabetes mellitus (RR 5.2), tobacco use (RR 4.5), and number of stents (RR 3.7).
- Minimal lumen diameter post-stent placement (RR 0.03) and duration of chest pain (RR 1.1) were also significant predictors.
Conclusions:
- Diabetes mellitus and tobacco use are significant independent predictors of stent thrombosis after primary stenting in acute myocardial infarction.
- These findings suggest a hypercoagulable state associated with diabetes and smoking contributes to stent thrombosis.
- Optimizing stent placement and managing risk factors like diabetes and smoking are crucial for preventing stent thrombosis.
Abstract:
The aim of the study was to determine if a hypercoagulable state that may persist for several months after an acute myocardial infarction may contribute to an increased incidence of stent thrombosis. Primary stenting was performed in 104 consecutive patients with acute myocardial infarction using 147 coronary stents. Twenty-eight patients (27%) were diabetic and 55 patients (53%) were smokers. A single stent was placed in 63%, two stents in 33%, and more than two stents in 4% of the patients. Procedural success was obtained in 97% of the patients. All stents were deployed using high-pressure balloon inflation. The reference vessel diameter and minimal lumen diameter after stent deployment were 3.30 +/- 0.42 and 3.23 +/- 0.42 mm, respectively. Six patients (5.7%) developed stent thrombosis within 1 month after the procedure complicated by reinfarction in five of the six patients. At 1-month follow-up, all patients remained alive. On multivariate analysis, independent predictors of stent thrombosis were diabetes mellitus (relative risk [RR] 5.2; 95% confidence interval [CI] 1.8, 25.1), tobacco use (RR 4.5; 95% CI 1.3, 24.5), number of stents: 1 vs. > 1 (RR 3.7; 95% CI 1.1, 15.9), minimal lumen diameter poststent placement (RR 0.03; 95% CI 0.0002, 0.74), and duration of chest pain before intervention (RR 1.1; 95% CI 1.01, 1.25). Stent thrombosis had not been associated with diabetes mellitus and tobacco use previously but is in agreement with the enhanced platelet aggregability, coagulation factor abnormalities, and impaired fibrinolysis characteristic of these patients.