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On-line vectorcardiography during elective coronary angioplasty indicates procedure-related myocardial infarction
J Jensen1, S V Eriksson, B Lindvall
1Department of Cardiology, Huddinge Hospital, Sweden. jje@cardio.ks.se
Insights
Continuous vectorcardiography (VCG) during percutaneous transluminal coronary angioplasty (PTCA) effectively identifies myocardial infarction. This method offers high sensitivity and specificity for detecting procedure-related cardiac events, aiding in immediate risk assessment.
Area of Science:
- Cardiology
- Medical Technology
- Diagnostic Imaging
Background:
- Elevated creatine kinase levels post-percutaneous transluminal coronary angioplasty (PTCA) correlate with increased cardiac mortality.
- Identifying procedure-related myocardial infarction (MI) during PTCA is crucial for patient outcomes.
Purpose of the Study:
- To assess the utility of continuous, on-line vectorcardiography (VCG) for detecting myocardial infarction during elective PTCA.
- To evaluate VCG as a real-time diagnostic tool for procedure-related MI.
Main Methods:
- 192 patients undergoing elective PTCA were monitored using VCG before, during, and after the procedure.
- Vectorcardiogram recordings focused on ST-segment vector magnitude (ST-VM) and ST-segment change vector magnitude (STC-VM).
- Continuous monitoring captured data for at least 30 minutes post-balloon inflation.
Main Results:
- Procedure-related myocardial infarction occurred in 7.8% of patients.
- Maximum STC-VM values demonstrated high predictive capability for MI (93% sensitivity, 59% specificity).
- Higher VCG values were observed in patients receiving stents, with a trend towards increased creatine kinase.
Conclusions:
- Continuous VCG monitoring is a valuable tool for the immediate detection of myocardial infarction during PTCA.
- This technique aids in identifying patients at increased risk for procedure-related cardiac events.
- VCG offers a promising approach for real-time risk stratification in interventional cardiology.
Background:
Increased creatine kinase concentrations after elective percutaneous transluminal coronary angioplasty (PTCA) have been shown to be associated with increased late cardiac mortality.
Objective:
To evaluate the potential of continuous on-line vectorcardiography during elective PTCA to identify procedure-related myocardial infarction.
Methods:
Patients (n = 192, ages 58 +/- 10 years), treated with elective and initially successful PTCA, were studied using vectorcardiogram (VCG) recordings. VCG monitoring was started 5 min before start of the PTCA and was carried out during the entire procedure, for at least 30 min after the first balloon inflation. ST-segment vector magnitude (ST-VM) and ST-segment change vector magnitude (STC-VM) were monitored.
Results:
Fifteen (7.8%) procedure-related myocardial infarctions occurred. Indicators of procedure-related myocardial infarction were maximum value of ST-VM (P < 0.001) and STC-VM (P < 0.001), total ischemic time of all ST-VM episodes (P < 0.001) and STC-VM episodes (P < 0.001). The variable most closely related to a procedure-related myocardial infarction was the maximum STC-VM value during the procedure. With an optimized cutoff value, maximum STC-VM predicts a procedure-related myocardial infarction with a sensitivity of 93%, a specificity of 59% and a negative predictive value of 99%. Patients who had a stent implanted had significantly greater VCG values (P < 0.05-P < 0.001) than the group without a stent. There was a trend (P < 0.06) to a relation between increased creatine kinase concentration and stent implantation. In patients both with and without an implanted stent, greater STC-VM values were associated with procedure-related myocardial infarction (P < 0.01).
Conclusion:
Continuous VCG monitoring during elective PTCA is a promising method for immediate detection of patients at increased risk of procedure-related myocardial infarction.