AAMA AAMA Electrocardiography and Diagnostic Testing

Question 1

How many electrodes are placed on a patient for a standard 12-lead ECG?

Accepted Answer

10 electrodes

Answer

A 12-lead ECG uses 10 electrodes (4 limb and 6 precordial) to produce 12 different views of the heart's electrical activity.

Question 2

Which ECG wave represents ventricular depolarization?

Accepted Answer

QRS complex

Answer

The QRS complex represents the electrical depolarization of the ventricles, which triggers ventricular contraction.

Question 3

What artifact on an ECG is caused by patient movement or shivering?

Accepted Answer

Somatic tremor artifact

Answer

Somatic tremor artifact appears as irregular, erratic baseline variation caused by voluntary or involuntary patient muscle movement.

Question 4

The PR interval on an ECG represents:

Accepted Answer

The time for an impulse to travel from the SA node through the AV node

Answer

The PR interval measures the time from the start of atrial depolarization (P wave) through the AV node delay to the start of ventricular depolarization.

Question 5

Which precordial lead is placed at the fourth intercostal space, right sternal border?

Accepted Answer

V1

Answer

V1 is positioned at the fourth intercostal space on the right sternal border, and V2 is at the same level on the left sternal border.

(AAMA) American Association of Medical Assistants Certified Practice Test

(AAMA) American Association of Medical Assistants Certified Practice Test

AAMA AAMA Electrocardiography and Diagnostic Testing