A new method to determine the QRS axis-QRS axis determination

Area of Science:

• Cardiology
• Medical Diagnostics
• Electrocardiography

Background:

• Accurate determination of the mean QRS axis (ÂQRS) is crucial in electrocardiography.
• Existing methods for ÂQRS calculation have limitations, highlighting the need for improved techniques.

Purpose of the Study:

• To introduce and validate a novel, simple method for determining the mean QRS axis (ÂQRS).
• To assess the accuracy of the proposed ÂQRS determination method compared to established techniques.

Main Methods:

• A new method utilizing the perpendicular axis to the mean QRS axis (P-ÂQRS) to divide limb leads into positive and negative groups.
• Analysis of 200 ECG recordings, comparing ÂQRS values obtained from the new method, computer interpretations, and a standard bipolar method.
• Statistical validation using Pearson correlation coefficient and Bland-Altman analysis.

Main Results:

• The new method demonstrated high accuracy, with a Pearson correlation coefficient of 0.976 (P < .001) when compared to the bipolar method.
• Bland-Altman analysis showed a mean bias of 0.885 with limits of agreement between -12.37° and 14.14°, indicating good agreement.
• Mean and standard deviations of ÂQRS values were remarkably similar across the compared methods.

Conclusions:

• The proposed new method is a simple and accurate tool for assessing the mean QRS axis (ÂQRS).
• This technique offers a reliable and potentially more accessible approach for ÂQRS determination in clinical practice.