Chapter 10 - The PR interval

Question 1

Lvl 1: What is a normal PR Interval?

A. 0.04-0.12 S
B. 0.08-0.16 S
C. 0.12-0.20 S
D. 0.16-0.24 S

Answer 1

C. 0.12-0.20 S

Question 2

Lvl 1: Pericarditis is indicated in what change to the PRI?

Answer 2

Depression of the PRI equal, or greater, to 0.8 mm

Question 3

Lvl 1: Aside from a normal finding and pericarditis, what other condition may lead to depression of the PRI?

A. Hyperkalemia
B. Wolf-Parkinson-White
C. Atrial infarct
D. None of the above

Answer 3

C. Atrial infarct

Question 4

Lvl 1: If the PRI is elongated, one should look at the other ECG intervals. What is a possible cause?

Answer 4

Hyperkalemia