What is the clinical evidence from this study?

Study design: Observational. Population: Acute myocardial infarction (n=61). Intervention: Acute left main coronary artery (LMCA) occlusion vs. Acute left anterior descending coronary artery (LADCA) proximal occlusion. Primary outcome: Reciprocal ST segment depression in lead V2 (p=< 0.001).

January 1, 2006Open Access

Reciprocal Changes in 12-Lead Electrocardiography Can Predict Left Main Coronary Artery Lesion in Patients With Acute Myocardial Infarction

Q: What are the key findings of this study?

Acute left main coronary artery occlusion was significantly associated with reciprocal ST segment depression in leads V2, V4, and aVF compared to proximal left anterior descending coronary artery occlusion.

Key Result

Acute left main coronary artery occlusion was significantly associated with reciprocal ST segment depression in leads V2, V4, and aVF compared to proximal left anterior descending coronary artery occlusion.

Study Design

Type

Observational (n=61)

Blinding

Blinded to angiographic findings

Multicenter

Yes

Structured PICO

Does reciprocal ST segment depression on a 12-lead ECG predict acute left main coronary artery occlusion in patients with acute myocardial infarction?

Population

61 patients with acute myocardial infarction who underwent emergency percutaneous coronary intervention for left main or proximal left anterior descending coronary artery lesions.

Exposure

Assessment of reciprocal ST segment depression on 12-lead electrocardiogram (ECG).

Comparator

Comparison of ECG findings between patients with LMCA occlusion and those with proximal LADCA occlusion.

Outcome

Ability of reciprocal ST segment depression in specific ECG leads to distinguish acute LMCA occlusion from proximal LADCA occlusion.surrogate

Reciprocal ST segment depression in leads V2, V4, and aVF on a standard 12-lead ECG serves as an important early predictor of acute left main coronary artery occlusion, potentially aiding in rapid clinical decision-making.

Main Result

Absolute Event Rate: 56% vs 0%

p-value: p=< 0.001

Limitations

Retrospective and descriptive study design
Small sample size
Great variation in the time from the start of symptoms until arrival at the ER, preventing standardization of ECG timing

Abstract

Acute left main coronary artery (LMCA) occlusion may result in acute myocardial infarction (AMI) or sudden death. ST elevation in the aVR and V1 leads is reported to be valuable in recognizing LMCA occlusion. Early recognition of electrocardiogram (ECG) changes, such as reciprocal ST depression in other leads, is helpful in averting this disaster. This study aimed to determine the reciprocal ST segment depression of 12-lead ECGs associated with acute LMCA occlusion. From January 2000 to December 2004, 61 patients who underwent emergency percutaneous coronary intervention in 3 hospitals due to AMI associated with LMCA (n = 18) and a left anterior descending coronary artery (LADCA) (n = 43) proximal lesion were selected. Reciprocal ST segment depression occurred in leads aVF, V(2), V(3), V(4), V(5), and V(6) with significantly higher incidence in the LMCA group than in the LADCA group. Stepwise linear multivariate discriminant analysis indicated that ST segment depression in leads aVF, V(2), and V(4) could distinguish the LMCA group from the LADCA group. We concluded that reciprocal ST segment depression in leads V(2), V(4), and aVF of a 12-lead ECG is an important predictor of acute LMCA occlusion.

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