ECG

Question 1

P wave

Answer 1

Atrial depolarization

Question 2

PR Interval

Answer 2

This extends from te beginning of the P wave to the onset of the QRScomplex.

This represents conduction through the atria to the AV node and Bundle of His.

Question 3

PR Interval normal duration

Answer 3

0.12 to 0.20

3 to 5 little boxes or one big box

Question 4

QRS Comples

Answer 4

This extends from the end of the PR interval and ends with the return to the basline (isoelectric line).

Ventricular Depolarization or the conduction from the AV nodes through the bundles of His, the bundle branches, and the purkinje system.

Question 5

QRS normal duration

Answer 5

0.04 to 0.11

1 to 3 little boxes

Question 6

ST Segment

Answer 6

This is the segment measured from the end of the QRS complex to the beginning of the T wave.

It represents the time during which the ventricles have completed depolarization and when re-polarization begins.

Question 7

Q-T Interval

Answer 7

Extends from the beginning of the QRS complex until the end of the T wave and represents the time interval for ventricular depolarization and re-polarization.

Question 8

Normal Q-T interval time

Answer 8

0.32 to 0.40

Prolongation is associated with drug toxicity and increased risk of dysrhythmias.