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Published on: February 16, 2011
Diagnostic value of standard electrocardiogram in acute right ventricular myocardial infarction
Ali Taherinia1, Koorosh Ahmadi1, Mehran Bahramian1
1Department of Emergency Medicine, Alborz University of Medical Sciences, Karaj, Iran.
Insights
Standard electrocardiograms effectively diagnose right ventricular infarction, a critical complication of heart attacks. ECG findings like ST depression in leads I and aVL show high sensitivity for detecting this condition, aiding early intervention.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Myocardial infarction (MI), or heart attack, is a leading cause of hospital mortality.
- Accurate diagnosis of MI, particularly right ventricular involvement, is crucial for patient outcomes.
- Electrocardiography (ECG) is a primary, non-invasive diagnostic tool for cardiac events.
Purpose of the Study:
- To evaluate the diagnostic accuracy of standard ECG criteria for identifying acute right ventricular infarction (RVMI) secondary to inferior MI.
- To compare specific ECG markers (ST depression in leads I, aVL, and combined I+aVL) against the gold standard (ST elevation in lead V4R).
Main Methods:
- A prospective study involving 66 patients diagnosed with acute primary myocardial infarction.
- Analysis of ECG parameters, including ST depression in leads I, aVL, and combined I+aVL, compared to ST elevation in lead V4R.
- Correlation of ECG findings with coronary artery involvement and clinical presentation.
Main Results:
- Right ventricular myocardial infarction was identified in 39% of patients (26 out of 66), based on ST elevation in lead V4R.
- ST depression in lead aVL and combined leads I+aVL demonstrated high sensitivity (96%) for detecting RVMI.
- The right coronary artery was the most frequent culprit vessel (78%) in cases of RVMI.
Conclusions:
- Standard ECG, particularly ST depression in leads I and aVL, is a valuable tool for diagnosing RVMI.
- ECG findings can help determine coronary artery occlusion sites and at-risk myocardial areas.
- Utilizing ECG for acute MI diagnosis facilitates early identification of high-risk patients, potentially preventing further damage and complications.
Abstract:
Myocardial infarction (MI) (i.e., heart attack) is the irreversible death (necrosis) of heart muscle secondary to prolonged lack of oxygen supply (ischemia) which accounts for a large number of deaths in the hospital. Diagnosis of myocardial infarction is confirmed based on clinical manifestations and electrocardiographic changes along with increased cardiac enzymes. Electrocardiogram (ECG) is one of the safest and easiest methods in the first place. Therefore, this study aimed to investigate the diagnostic value of standard electrocardiogram in the diagnosis of acute right ventricular infarction following lower cardiac infarction. This research was carried out at a time interval of one and a half years to diagnose acute primary infarction. In this method, the diagnostic value of ST↓ in lead I, ST↓ in lead aVL and I ST↓ + aVL, compared with ST↑ in lead V4R was investigated for diagnosis of right ventricular infarction. ST↑ in the lead V4R is a gold standard for the detection of right ventricular MI. All the patients who had the inclusion criteria were allowed to participate in the study. A total of 66 patients participated in the study. Accordingly, 58 (87%) were male and 8 (13%) were female. The mean age of the population was 54.9 ± 11.41. According to the ST↑ standard in lead V4R, 26 patients (39%) had right ventricular myocardial infarction. There was no significant relationship between angina pectoris and premature infarction (P-Value = 0.869). In this study, the right ventricular was most commonly involved in right coronary artery (78%). There was no significant relationship between the occlusion of right coronary artery and right ventricular infarction in 60 patients (P-Value = 0.94). The results showed that electrocardiogram manifestations help determine the occlusion site and the area at risk (ST↓ in lead aVL and aVL + I, sensitivity = 96%). In myocardial infarction, symptoms such as the ST-Segment elevation in lead aVR and ST-Segment depression in the lower leads are possible. Accordingly, in the lower infarction, ST changes in the leads V1-V6 are helpful in detecting patients at risk. Thus, the use of electrocardiogram in acute myocardial infarction helps detect more invasive patients and prevents extensive myocardial damage and other complications.
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