As noted above, the precordial leads are unreliable, compromising by their inclusion calculations deriving from the set of 12 ECG leads. It appears, therefore, that using sums of data from the six ...

This results in negatively-directed flutter waves in the inferior leads. At times, the direction of the circuit can reverse, causing clockwise atrial flutter from the same anatomical location.

The purpose of this study was to evaluate whether the 12-lead ECG could be substituted by ECG sets with a limited number of leads. Materials and methods: The performance of three ECG systems (ie ...

This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia occurs ... since it originates in the atrium at a different location than the sinus node.