AMCA EKG / Electrocardiography

Question 1

How many leads are recorded in a standard 12-lead ECG?

Accepted Answer

12

Answer

6

Answer

10

Answer

16

Question 2

Which ECG lead is placed on the fourth intercostal space at the RIGHT sternal border?

Accepted Answer

V1

Answer

V2

Answer

V3

Answer

V4

Question 3

A patient's ECG shows a sawtooth pattern at approximately 300 bpm with no discernible P waves. This finding is most consistent with:

Accepted Answer

Atrial flutter

Answer

Ventricular fibrillation

Answer

Normal sinus rhythm

Answer

Atrial fibrillation

Question 4

Somatic tremor artifact on an ECG tracing is MOST likely caused by:

Accepted Answer

Patient movement or muscle activity

Answer

Improper grounding of the machine

Answer

Incorrect lead placement

Answer

Low electrode gel conductivity

Question 5

Which interval on an ECG represents the total time for ventricular depolarization AND repolarization?

Accepted Answer

QT interval

Answer

PR interval

Answer

QRS complex

Answer

ST segment

Question 6

When a limb lead electrode falls off mid-recording, the BEST immediate action is to:

Accepted Answer

Stop the recording, reattach the electrode, and retake the tracing

Answer

Continue recording and note the artifact in the chart

Answer

Switch to a different lead configuration

Answer

Increase the machine sensitivity to compensate