Exam 49: Principles of Electrocardiography

The standard speed for an ECG recording is 50 mm/sec.

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

Polarization is the same thing as myocardial contraction.

The QRS complex shows the contraction of both __________ and also reflects the completion of cardiac depolarization.

The SA node stimulates both atria to depolarize at the same time.

PVCs are recorded when the ventricles depolarize before a P wave.

A cardiac event monitor must be worn at all times, even during bathing, to detect cardiac abnormalities.

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

Which statement is true about lead II?

The medical assistant may assist with pacemaker implantation in the physician's office setting.

The electrocardiograph records both the intensity of and the actual time required for each part of the cardiac cycle.

A patient in V-tach does not have a pulse.

The image created on the ECG paper is made by the:

The __________ is the electric recording of the heart at rest.

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

If the ECG recording appears as a series of irregular, jagged peaks, the medical assistant should:

Which statement is true about ECG paper?

An implanted ICD monitors the heart rhythm and automatically performs __________ if it detects a dangerous tachycardia or fibrillation.

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:

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.