Wave / Interval

Question 1

P wave

Answer 1

ATRIAL DEPOLARIZATION
Normally precedes the QRS wave

Time: 0.06 - 0.12
Boxes: 1.5 - 3

Question 2

PR Interval

Answer 2

Start of P wave to QRS complex
Time for ATRIAL DEPOLARIZATION
Time for impulse to leave SA node and go through AV node to ventricles

Time: 0.12 - 0.2
Boxes: 3 - 5

Question 3

QRS Complex

Answer 3

Start of Q wave to the end of S wave
VENTRICULAR DEPOLARIZATION
(and ATRIAL REPOLARIZATION)

Time: Less than 0.12
Boxes: Less than 3

Question 4

ST segment

Answer 4

Time from completion of VENTRICULAR DEPOLARIZATION and
beginning of VENTRICULAR REPOLARIZATION

Time: 0.12
Boxes: 3

Question 5

T wave

Answer 5

VENTRICULAR REPOLARIZATION

Time: 0.16
Boxes: 4

Question 6

QT Interval

Answer 6

Combined VENTRICULAR DEPOLARIZATION and REPOLARIZATION

Time: 0.34 - 0.43
Boxes: 8.25 - 10.75

Question 7

For HR

Answer 7

divide 1500 by the # of boxes

from one R wave to the next R wave