Question

Abnormally slow depolarization of the ventricles would most change the shape of the ________ in an ECG tracing. Group of answer choices P wave T wave QRS complex P-R interval

Answer 1

Abnormally slow depolarization of the ventricles would most change the shape of the QRS complex in an ECG tracing.

• The conduction system in the ventricles depolarizes, and this depolarization spreads along the walls of the ventricles to produce the QRS complex.
• It represents electrical activity that occurs before the ventricles contract (ventricular systole). The QRS complex appears immediately after the onset of ventricular systole.
• An aberrant depolarization of the ventricles results in the formation of an abnormal QRS complex.
• The SA node, an ectopic pacemaker in the atria, AV junction, bundle branches, Purkinje network, or the ventricular myocardium are all possible pacemaker sites in these aberrant QRS complexes.
• An aberrant QRS complex might have any shape, from normal to wide and odd to slurred and notched.

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