Key result
Left coronary dominance linked to a ~14 degree higher QRS axis versus right or codominant patterns.
Why the study?
Coronary artery dominance influences myocardial perfusion territory, but its association with the QRS axis on 12-lead surface ECG had not been investigated.
Does coronary arterial dominance affect the QRS axis in patients without significant coronary artery and structural cardiac disease?
Cross-Sectional (n=133)
No
Does coronary arterial dominance affect the QRS axis in patients without significant coronary artery and structural cardiac disease?
Absolute Event Rate: 38.6% vs 24.9%
p-value: p=0.019
Left coronary arterial dominance is associated with a higher QRS axis on surface ECG in patients without significant structural or coronary artery disease.
Left dominance links to higher QRS axis in normal hearts; leaves open relevance for ECG interpretation or further study.
Aim: Coronary artery dominance influences the amount and anatomic location of myocardium that is perfused by the left or right coronary circulation. However, the association between coronary arterial dominance and the QRS axis on 12-lead surface electrocardiography (ECG) was not investigated. The present study aims to evaluate the relationship between coronary arterial dominance and the QRS axis on ECG in patients without significant coronary artery and structural cardiac disease.Material and Methods: Overall, 133 patients, without significant CAD and who met the inclusion criteria, participated in this study. A standard surface 12-lead ECGs were performed in all study patients. QT interval, QTc interval, QRS duration, PR interval, P wave and QRS axis were determined. Based on the origin of the posterior descending coronary artery, coronary circulation was categorised into left, right, and balanced coronary dominance.Results: There were 133 subjects with 56 right dominant (42%), 39 left dominant (29%) and 38 codominant (29%) pattern. QRS axis value was found to be significantly higher in the left dominant group when compared with the codominant and right dominant group (p˂0.05). No significant difference was observed between the codominant and right dominant groups regarding QRS axis values. The axis of (+30)-(+90) ratio in the left dominant group was found to be significantly higher when compared with the codominant and right dominant group (p˂0.05). No significant difference was observed between the codominant and right dominant groups regarding the axis of (+30)-(+90) ratio. Conclusion: Our findings suggested that the QRS axis may be related to coronary artery dominance
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Ahmet Korkmaz (2019) conducted a cross-sectional in No significant coronary artery disease (n=133). Left coronary artery dominance vs. Right dominant and codominant coronary circulation was evaluated on QRS axis value (degrees) (p=0.019). Left coronary artery dominance was associated with a significantly higher QRS axis (mean 38.6 degrees) compared to right dominant and codominant patterns in patients without significant coronary artery disease.
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