EKG Normal Limits

Question 0

PR interval (SA node to AV node)

Answer 0

Duration: 0.12-0.20 seconds (between 3 and 5 little boxes)

measured from beginning of p wave to end of pause

Question 1

P wave (atrial deploarization)

Answer 1

Duration: <2.5 mm

Question 2

QRS complex

Answer 2

Duration: < 0.12 seconds (3 little boxes)

Question 3

ST segment

Answer 3

Depression: < 1mm (1 little box) from baseline
Elevation: <1mm (1 little box) from baseline
pathological if outside of these limits

Question 4

QT interval

Answer 4

RATE DEPENDENT
measured from beginning of Q to end of T wave
Duration: <1/2 the R-to-R intervals

Question 5

What is the only portion of EKG tracing that is rate dependent for normal limits?

Answer 5

QT interval