18. The Heart

How many leads are used in a standard electrocardiogram (ECG)?

Which portion of the ECG corresponds to the repolarization of the atria?

Which portion of the ECG depicts ventricular depolarization?

What event(s) occur during the QRS complex of an ECG?

What does the QRS wave of the electrocardiogram (ECG) represent?

What part of an electrocardiogram (ECG) represents ventricular repolarization?

Ventricular depolarization and repolarization are represented by which measure on an electrocardiogram (ECG)?

Which portion of the ECG cycle overlaps with the expected ventricular contraction (systole)?

During which part of the ECG are the ventricles repolarizing?

Which of the following best describes what happens during the T wave of an ECG?

During which part of the ECG are the atria repolarizing?

If heart rate increases, which of the following changes would you expect to see on an electrocardiogram (ECG)?

What leads to the production of the P wave in an electrocardiogram?

Atrial depolarization is represented by which of the following waves on an electrocardiogram (ECG)?

Which of the following actions will help you obtain the best-quality ECG tracing?