Exam 42: Principles of Electrocardiography

The augmented leads, which include aV_R and aV_L, record the electrical activity between specific points on the chest wall and within the heart.

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

Bradycardia is defined as

Which deflection from the baseline represents the repolarization of the ventricles?

If a patient has dyspnea or orthopnea, which of the following positions is acceptable for performing an electrocardiogram?

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

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.

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

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

Preparation of a patient for an ECG includes

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

The __________ control(s) the rate of heart contraction by initiating contractions 60 to 100 times a minute.

The precordial, or chest, leads are __________ and are designated V₁, V₂, V₃, V₄, V₅, and V₆.

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

PACs may be recorded in patients who smoke or consume large quantities of caffeine.

Which of the following is seen on the ECG strip of a patient with an MI?

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

__________ refers to a regular heart rate that ranges from 60 to 90 bpm.

Which of the following is the most critical, life-threatening arrhythmia that can quickly result in death if not treated?

The _________ reflects the time between the end of ventricular contraction and the beginning of ventricular recovery.