Discriminating between right coronary artery and circumflex artery occlusion by using a noninvasive 18-lead
1The College of Nursing, University of Arizona, Tucson, AZ 85721-0203, USA. shufen@nursing.arizona.edu
Insights
An 18-lead electrocardiogram effectively differentiates circumflex artery from right coronary artery occlusion. This helps guide percutaneous coronary intervention and predict conduction disturbances.
Area of Science:
- Cardiology
- Diagnostic Electrocardiography
Background:
- Distinguishing circumflex artery from right coronary artery occlusion is challenging due to similar inferior myocardial infarction patterns on ECG.
- Acute myocardial infarction location is critical for guiding treatment strategies.
Purpose of the Study:
- To evaluate the utility of an 18-lead electrocardiogram (ECG) in differentiating coronary artery occlusion sites.
- To assess if an inexpensive 18-lead ECG can provide actionable diagnostic information.
Main Methods:
- Continuous 18-lead ECGs (standard 12-lead, right ventricular, posterior leads) were recorded.
- Subjects included 38 undergoing right coronary artery intervention and 50 undergoing circumflex artery intervention.
Main Results:
- ST-segment elevation in posterior leads was significantly more frequent in circumflex artery occlusion (P < .001).
- ST-segment elevation in right ventricular and inferior leads was more common in right coronary artery occlusion.
- ST-segment depression in lead aVL suggests right coronary occlusion; ST-segment elevation in posterior leads without aVL depression indicates circumflex occlusion.
Conclusions:
- 18-lead ECG ST-segment changes reliably differentiate between circumflex and right coronary artery occlusions.
- Pre-percutaneous coronary intervention localization aids procedural planning and identification of high-risk patients for atrioventricular node conduction disturbances.
Background:
Differentiating occlusion of the circumflex branch of the left coronary artery (also called the circumflex artery) from occlusion of the right coronary artery is often difficult because either may be associated with a pattern of acute inferior myocardial infarction on the electrocardiogram.
Objectives:
To determine if an inexpensive 18-lead electrocardiogram can provide useful information in differentiating sites of coronary occlusion.
Methods:
Continuous 18-lead electrocardiograms, including standard 12-lead, right ventricular, and posterior leads, were recorded in 38 and 50 subjects undergoing percutaneous coronary interventions in the right coronary artery and the circumflex artery, respectively.
Results:
ST-segment elevation in the posterior leads was twice as frequent during occlusion of the circumflex artery as during right coronary occlusion (P < .001). ST-segment elevation in the right ventricular leads and inferior leads occurred more often during occlusion of the right coronary artery than during occlusion of the circumflex artery. ST-segment depression in lead aVL is highly suggestive of right coronary occlusion, whereas ST-segment elevation in posterior leads without depression of the ST segment in lead aVL is highly sensitive and specific for occlusion of the circumflex artery.
Conclusions:
ST-segment changes in the 18-lead electrocardiogram can be used to differentiate between occlusions of the circumflex artery and occlusions of the right coronary artery. Knowing which vessel is occluded before percutaneous coronary intervention can help in planning the procedure and recognizing when patients are at high risk for disturbances in conduction at the atrioventricular node.
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