Exam 42: Principles of Electrocardiography

A monitor that a patient wears for 24 hours is called a(n)

Which of the following leads records tracings between the left arm and left leg, which reflects the electrical activity of the inferior surface of the left ventricle?

What part of the ECG complex represents atrial depolarization?

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

A pounding or racing heart, which may or may not indicate a serious heart disorder, is called ____________.

The __________ on an ECG machine creates the image on the ECG paper.

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

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

The image created on the ECG paper is made by the

The P wave shows the beginning of cardiac depolarization.

Which statement is true about lead II?

Every fifth line on ECG paper, both vertically and horizontally, is darker than the other lines and creates a large square measuring __________ on each side.

Digitalis toxicity may cause specific ECG changes.

After electrical stimulation the ventricles contract, emptying oxygen-rich blood into the pulmonary artery.

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

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

The AV node sends the electric impulse through the __________, which stimulates the right and left ventricular walls.

Summarize the immediate treatment of an MI. Explain why certain medications are administered.

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

The __________ leads use two limbs to record the heart's electrical activity.