ABSTRACT
After measuring the PR interval, go on to examine the QRS complex in each lead. Begin by looking for Q waves. A Q wave is present whenever the first deflection of the QRS complex points downwards (Fig. 7.1).
After measuring the PR interval, go on to examine the QRS complex in each lead. Begin by looking for Q waves. A Q wave is present whenever the first deflection of the QRS complex points downwards (Fig. 7.1).