What does the presence of an R wave indicate on an EKG?

What does the presence of an R wave indicate on an EKG?

• A. Depolarization of the atria
• B. Repolarization of the ventricles
• C. Heart rate calculations
• D. Depolarization of the ventricles

Answer: (D)

The presence of an R wave on an EKG is significant because it represents the depolarization of the ventricles. This is the phase of the cardiac cycle where the ventricular muscle cells become electrically activated, leading to contraction and the subsequent pumping of blood out of the heart. The R wave is the upward deflection that appears in the QRS complex, which indicates the electrical activity as it spreads through the ventricles.

This ventricular depolarization occurs after the atrial depolarization and is crucial for the effective functioning of the heart. Understanding that the R wave specifically focuses on the ventricular activity is key in interpreting EKGs, as it helps in assessing the electrical conduction system and identifying any abnormalities in heart function.