Exam 42: Principles of Electrocardiography

An abrasive device must be applied to each electrode placement site before an ECG can be obtained.

The most distal portions of the electrical system of the myocardium are the __________.

The QRS complex shows as a positive deflection in V₁ and V₂ views.

Lead __________ records the electrical activity between the left arm and the left leg.

A(n) __________ is an ectopic ventricular beat that occurs without a preceding P wave.

If the ECG recording appears as a series of small, uniform spikes in the baseline, the medical assistant should

The __________ is a combination of all of the electric events that occur in the heart during a single heartbeat.

In the case of __________, the patient has general malaise and muscle cramps. The condition may occur if diuretics are used without potassium supplementation.

Which of the following may be seen on an ECG when the pathway of the electrical charge is normal, but the rate or rhythm of the heartbeat is altered?

The image created on the ECG paper is made by the

The right leg is used to ground the recording of the augmented leads.

Which of the following is referred to as sinus bradycardia?

Digitalis toxicity may cause specific ECG changes.

Which cardiac diagnostic tool requires the patient to exercise during the procedure?

In a standard 12-lead ECG, the measurement of current that the heart muscle produces between the right arm electrode and the left arm electrode is known as the

The P wave shows the beginning of cardiac depolarization.

To check the standardization of the ECG machine, the medical assistant depresses the standardization button. The stylus should deflect how many millimeters?

One of the most specific ECG changes that occurs in patients with an MI is elevated T waves.

Which of the following represents the time from the beginning of atrial contraction to the beginning of ventricular contraction?

Which statement is not true about V-fib?