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Published on: April 10, 2014
Differences in initial electrocardiographic findings between ST-elevation myocardial infarction due to left main
Toshiharu Fujii1, Misaki Hasegawa1, Junichi Miyamoto1
1Department of Cardiology, Division of Cardiovascular Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, 259-1193, Japan.
Insights
Electrocardiograms can identify ST-elevation myocardial infarction (STEMI) from left main trunk (LMT) lesions. Key findings include reciprocal ST depression in inferior leads and V5 depression, distinguishing LMT-STEMI from left anterior descending artery lesions.
Area of Science:
- Cardiology
- Medical Diagnostics
- Emergency Medicine
Background:
- Early identification of ST-elevation myocardial infarction (STEMI) is critical for timely intervention.
- Distinguishing STEMI caused by left main trunk (LMT) lesions from other coronary artery occlusions is clinically important.
- Electrocardiographic (ECG) criteria can aid in the prompt diagnosis of STEMI subtypes.
Purpose of the Study:
- To investigate distinct electrocardiographic (ECG) findings in patients with STEMI due to LMT lesions.
- To compare ECG characteristics between STEMI caused by LMT lesions and those caused by left anterior descending (LAD) artery lesions.
Main Methods:
- Retrospective analysis of initial ECGs from 435 STEMI patients with analyzable recordings.
- Patients were categorized into three groups: LMT lesions (n=39), proximal LAD lesions (pLAD, n=224), and distal LAD lesions (dLAD, n=172).
- ST-segment deviations in 12 leads were assessed in patients without bundle branch block.
Main Results:
- Significant differences in ST-segment deviation magnitudes were observed across leads II, III, aVR, aVL, aVF, and V2-V6.
- Characteristic findings for LMT lesions included: (A) greater ST depression in lead II than ST elevation in V2 (47.1% vs. 0.6%/1.3%), and (B) ST depression in lead V5 (58.8% vs. 6.7%/2.5%).
- These specific ECG patterns demonstrated superior negative predictive value compared to conventional ST elevation in lead aVR.
Conclusions:
- Significant reciprocal ST-segment depression in inferior leads is a key indicator for LMT-STEMI.
- ST-segment depression in lead V5 is another valuable ECG finding for identifying STEMI due to LMT lesions.
- These ECG findings facilitate the determination of STEMI originating from an LMT lesion.
Background:
Early discrimination of ST-elevation myocardial infarction (STEMI) due to a left main trunk (LMT) lesion provided by straightforward electrocardiographic criteria is useful for prompt treatment. The purpose of this study is to investigate differences in electrocardiographic findings between STEMI due to lesions of LMT and those of left anterior descending artery (LAD).
Methods:
Initial electrocardiogram (ECG) recordings of 435 patients with analyzable ECGs from a cohort of 940 consecutive STEMI patients were analyzed retrospectively for presence of LMT lesions (LMT, n = 39), proximal (pLAD, n = 224) and distal LAD lesions (dLAD, n = 172). ST-segment deviations in 12 leads were assessed among 3 groups without bundle branch block (n = 17 in LMT, n = 180 in pLAD, and n = 159 in dLAD).
Results:
Magnitudes of ST-segment deviations showed significant differences in leads II, III, aVR aVL, aVF, and V2-V6 across the three groups. This difference suggested two possible characteristic findings in the LMT group, allowing it to be distinguished from the pLAD or dLAD group; (A) larger magnitude of ST-segment depression in lead II than that of ST-segment elevation in lead V2 (47.1% in LMT vs. 0.6% in pLAD vs. 1.3% in dLAD, P < 0.0001), and (B) ST-segment depression in lead V5 (58.8% in LMT vs. 6.7% in pLAD vs. 2.5% in dLAD, P < 0.0001). These findings exhibited superior negative predictive value over conventional ST-segment elevation in lead aVR.
Conclusions:
A large reciprocal ST-segment depression in inferior leads and ST-segment depression in lead V5 are useful ECG findings allowing determination of STEMI due to an LMT lesion.
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