Typical ECG findings for right axis deviation: Lead II has the most positive deflection compared to leads I and III.Typical ECG findings for normal cardiac axis: Read our cardiac axis guide to learn more. To determine the cardiac axis you need to look at leads I, II and III. In a healthy individual, the axis should spread from 11 o’clock to 5 o’clock. Measure the R-R intervals to assess if the rhythm is regular or irregular 1Ĭardiac axis describes the overall direction of electrical spread within the heart. As you move along the rhythm strip, you can then see if the PR interval changes, if QRS complexes are missing or if there is complete dissociation between the two. If you are suspicious that there is some atrioventricular block (AV block), map out the atrial rate and the ventricular rhythm separately (i.e.
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