RMA EKG and Electrocardiography

Question 1

What does the P wave on an EKG tracing represent?

Accepted Answer

Atrial depolarization

Answer

Ventricular depolarization

Answer

Ventricular repolarization

Answer

Atrial repolarization

Question 2

How many electrodes are applied to the patient's body for a standard 12-lead EKG?

Accepted Answer

10

Answer

12

Answer

6

Answer

16

Question 3

Where is electrode V4 placed during a 12-lead EKG?

Accepted Answer

Midclavicular line, 5th intercostal space

Answer

Right sternal border, 4th intercostal space

Answer

Left sternal border, 4th intercostal space

Answer

Anterior axillary line, 5th intercostal space

Question 4

What EKG artifact is commonly caused by the patient's muscle movement or shivering?

Accepted Answer

Somatic tremor artifact

Answer

AC interference (60-cycle interference)

Answer

Baseline wander

Answer

Lead reversal artifact

Question 5

Which EKG finding is associated with acute myocardial infarction (heart attack)?

Accepted Answer

ST segment elevation

Answer

Prolonged PR interval

Answer

Shortened QT interval

Answer

Prominent U wave

Question 6

What is the normal duration of the QRS complex on a standard EKG?

Accepted Answer

0.06 to 0.10 seconds

Answer

0.12 to 0.20 seconds

Answer

0.30 to 0.44 seconds

Answer

Less than 0.04 seconds