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ACUTE CORONARY SYNDROMES

Prediction of acute left main coronary artery obstruction by 12-lead electrocardiography

ST segment elevation in lead aVR with less ST segment elevation in lead V₁

Hirosuke Yamaji, MD^* , Kohichiro Iwasaki, MD, Shozo Kusachi, MD^*,* , Takashi Murakami, MD^*, Ryouichi Hirami, MD^*, Hiromi Hamamoto, MD^*, Kazuyoshi Hina, MD, Toshimasa Kita, MD, Noburu Sakakibara, MD and Takao Tsuji, MD^*

^* Department of Internal Medicine I, Faculty of Medicine, Okayama, Japan
Department of Medical Technology, Faculty of Health Sciences, Okayama University Medical School, Okayama, Japan
Cardiovascular Center, Sakakibara Hospital, Okayama, Japan

Manuscript received October 5, 2000; revised manuscript received June 6, 2001, accepted July 19, 2001.

^* Reprint requests and correspondence: Dr. Shozo Kusachi, Department of Internal Medicine I, Okayama University Medical School, 2-5-1, Shikata-cho, Okayama 700-8558, Japan
skusachi{at}ccews2.cc.okayama-u.ac.jp

OBJECTIVES

We sought to determine the electrocardiographic (ECG) features associated with acute left main coronary artery (LMCA) obstruction.

BACKGROUND

Prediction of LMCA obstruction is important with regard to selecting the appropriate treatment strategy, because acute LMCA obstruction usually causes severe hemodynamic deterioration, resulting in a less favorable prognosis.

METHODS

We studied the admission 12-lead ECGs in 16 consecutive patients with acute LMCA obstruction (LMCA group), 46 patients with acute left anterior descending coronary artery (LAD) obstruction (LAD group) and 24 patients with acute right coronary artery (RCA) obstruction (RCA group).

RESULTS

Lead aVR ST segment elevation (>0.05 mV) occurred with a significantly higher incidence in the LMCA group (88% [14/16]) than in the LAD (43% [20/46]) or RCA (8% [2/24]) groups. Lead aVR ST segment elevation was significantly higher in the LMCA group (0.16 ± 0.13 mV) than in the LAD group (0.04 ± 0.10 mV). Lead V₁ ST segment elevation was lower in the LMCA group (0.00 ± 0.21 mV) than in the LAD group (0.14 ± 0.11 mV). The finding of lead aVR ST segment elevation greater than or equal to lead V₁ ST segment elevation distinguished the LMCA group from the LAD group, with 81% sensitivity, 80% specificity and 81% accuracy. A ST segment shift in lead aVR and the inferior leads distinguished the LMCA group from the RCA group. In acute LMCA obstruction, death occurred more frequently in patients with higher ST segment elevation in lead aVR than in those with less severe elevation.

CONCLUSIONS

Lead aVR ST segment elevation with less ST segment elevation in lead V₁ is an important predictor of acute LMCA obstruction. In acute LMCA obstruction, lead aVR ST segment elevation also contributes to predicting a patient’s clinical outcome.

Abbreviations and Acronyms   CK = creatine kinase   ECG = electrocardiogram   LAD = left anterior descending coronary artery   LCx = left circumflex coronary artery   LMCA = left main coronary artery   MI = myocardial infarction   RCA = right coronary artery

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