Designing Nomogram for Determining the Hearts QRS Axis

[摘要] Background: Electrocardiogram is a recording of the heart’s electrical activity which could be very informative in the approach to patients withcardiac or non-cardiac problems. Determining the electrical axis of the heart (mainly QRS complex axis) is the first step in interpreting theelectrocardiogram of a patient and has important applications in both clinical and epidemiological studies. Aim: This study was performed todesign a nomogram for the exact determination of the heart’s QRS axis. Settings and Design: We used the corrected formula to determine theheart’s QRS axis. Materials and Methods: In order to calculate the electrical axis of the heart in the frontal plane, we used the combination of leadsI and aVF. We used MATLAB m-code programming to design the nomogram according to the corrected formula. Results: Our work is anomogram which uses leads I and aVF to calculate the heart’s electrical QRS axis. This nomogram covers the mean QRS complex between –30and +30 small squares. Conclusion: This recording helps in the long-term assessment of physiological axis changes during treatment and followup.By means of this nomogram, the effects of pathological factors on the heart’s axis could be evaluated more accurately.

[学科分类] 心脏病和心血管学

[关键词] heart axis;nomogram;QRS