Waves, Complexes, Segments, and Intervals

Question 0

PR segment

Answer 0

Represents the time the electrical impulse is passing through the A-V junction to the ventricles- no electrical activation

Question 1

P wave

Answer 1

Represents depolarization of the atrial electrical cells

Question 2

PR interval

Answer 2

Represents the time required for the electrical impulse to depolarize the atria, travel through the AV node and Bundle of His to the ventricles

Question 3

PR interval 6-11 yrs

Answer 3

0.09-0.17 sec

Question 4

PR interval 3-5 yrs

Answer 4

0.08-0.16 sec

Question 5

PR interval 1-2 yrs

Answer 5

0.08-0.15 sec

Question 6

PR interval less than 1 yr

Answer 6

0.07-0.14 sec

Question 7

QRS complex

Answer 7

Represents depolarization of the ventricular electrical cells

Question 8

QRS width

Answer 8

Measures the time required for the electrical impulse to traverse both the right and left ventricles; normal adult 0.10 sec or less

Question 9

QRS width 6-11 yrs

Answer 9

0.04-0.09 sec

Question 10

QRS width 1-5 yrs

Answer 10

0.04-0.08 sec

Question 11

QRS width less than 1 yr

Answer 11

0.03-0.08 sec

Question 12

ST segment

Answer 12

Represents the beginning of ventricular repolarization

Question 13

J point

Answer 13

The point at which the QRS complex joins the ST segment

Question 14

T wave

Answer 14

Represents the last two phases of ventricular repolarization

Question 15

QT interval adult

Answer 15

No longer than 0.52 sec

Question 16

QT interval time in infants

Answer 16

No longer than 0.46 sec

Question 17

QT interval time in children

Answer 17

No longer than 0.44 sec