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Published on: December 11, 2016
ST elevation measurements differ in patients with inferior myocardial infarction and right ventricular infarction
Dong-Woo Seo1, Chang Hwan Sohn, Jeong Min Ryu
1Department of Emergency Medicine, University of Ulsan, Seoul, South Korea.
Insights
ST-segment elevation (STE) measurement methods significantly impact electrocardiography results in inferior myocardial infarction (MI). Standardizing STE measurement is crucial for accurate diagnosis and treatment.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Electrocardiography
Background:
- Standardized measurement methods for ST-segment elevation (STE) in acute myocardial infarction (MI) are not well-defined.
- Accurate STE measurement is critical for diagnosing inferior MI and right ventricular infarction.
Purpose of the Study:
- To assess differences in electrocardiography results based on STE measurement timing (J point vs. 60 ms later).
- To evaluate the impact of measurement methods on diagnostic accuracy, particularly in the V4R lead for inferior MI.
Main Methods:
- Retrospective analysis of 88 patients with inferior ST-elevation MI (STEMI) and 109 controls with non-STEMI.
- STE measurements were taken at the J point and 60 milliseconds after the J point in limb and V4R leads.
- Diagnostic accuracy of the V4R lead was calculated using a 1-mm STE criterion in two consecutive leads.
Main Results:
- Measurements 60 ms after the J point were significantly higher in the STEMI group at leads II, III, aVF, and V4R.
- Significant differences in measurements were observed in the control group only at lead I.
- Diagnostic sensitivity varied by 5% in the STEMI group and 1-3% in the control group, with a 10-11% difference at the V4R lead.
Conclusions:
- The method used to measure STE significantly influences results in patients with inferior MI.
- There is a clear need for standardization of STE measurement techniques in clinical practice.
Purpose:
Few studies specify the methods used to measure ST-segment elevation (STE). We therefore assessed differences in electrocardiography results depending on STE measurement methods for patients with inferior acute myocardial infarction (MI) and right ventricular infarction.
Methods:
This study was a retrospective analysis. The STE group consisted of 88 patients consecutively admitted to the emergency department with inferior ST elevation MI associated with occlusion of right coronary artery or left circumflex coronary artery who underwent primary percutaneous coronary intervention. The control group consisted of 109 patients with non-ST elevation MI who had occlusion of right coronary artery or left circumflex coronary artery and underwent percutaneous coronary intervention. Measurements were performed at the J point and 60 milliseconds later for limb lead and right precordial V(4) lead (V4R). The criterion of at least 1-mm STE in 2 consecutive leads was applied, and the diagnostic accuracy of V4R was calculated.
Results:
In the STE group, the measurements 60 milliseconds after the J point were significantly higher than measurements at the J point at the II, III, aVF, and V4R leads. In the control group, only the measurements at lead I differed significantly. There was a 5% difference in diagnostic sensitivity depending on the measuring points in the STE group, a 1% to 3% difference in the control group, and a 10% to 11% difference at the V4R lead.
Conclusion:
In patients with inferior MI, STE depends on the method of measurement, indicating a need for the standardization of measurements.
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