CCBMA Diagnostic Procedures and ECG

Question 1

In a standard 12-lead ECG, how many chest (precordial) leads are included?

Accepted Answer

6

Answer

4

Answer

8

Answer

12

Question 2

What does the P wave on an ECG represent?

Accepted Answer

Atrial depolarization

Answer

Ventricular depolarization

Answer

Ventricular repolarization

Answer

AV node conduction delay

Question 3

Which ECG lead placement error is most likely to produce artifact?

Accepted Answer

Placing electrodes over bony prominences

Answer

Cleaning skin with alcohol before electrode placement

Answer

Instructing the patient to lie still

Answer

Using fresh electrodes

Question 4

Which preparation step is most important before placing ECG electrodes?

Accepted Answer

Clipping excessive hair and cleaning with alcohol

Answer

Applying lotion to the skin

Answer

Asking the patient to exercise briefly

Answer

Placing electrodes over clothing

Question 5

Where is the V1 electrode placed in a standard 12-lead ECG?

Accepted Answer

4th intercostal space, right sternal border

Answer

5th intercostal space, midclavicular line

Answer

4th intercostal space, left sternal border

Answer

5th intercostal space, anterior axillary line

Question 6

A somatic tremor artifact on an ECG is most likely caused by:

Accepted Answer

Patient muscle movement or shivering

Answer

Electrical interference from equipment

Answer

Incorrect lead placement

Answer

Worn or dried electrode gel