Normal Sinus Rhythm Values

Question 1

Typical length of P wave?

Answer 1

0.06 - 0.10 seconds

Question 2

Typical amplitude of P wave?

Answer 2

0.5 - 2.5 mm

Question 3

Typical shape of P wave?

Answer 3

Round, upright/positive

Question 4

Typical length of PR interval?

Answer 4

0.12 - 0.20 seconds

Question 5

Typical length of QRS complex?

Answer 5

0.06 - 0.12 seconds

Question 6

Typical shape of QRS complex?

Answer 6

Tall and narrow

Question 7

Typical length of QT interval?

Answer 7

0.36 - 0.44 seconds

Question 8

Is the T wave symmetrical or asymmetrical on sinus rhythm?

Answer 8

Slightly asymmetric

Question 9

What does the P wave represent?

Answer 9

Atrial depolarization

Question 10

What does the PR segment represent?

Answer 10

Electrical impulse traveling from the AV node to the bundle of His, bundle branches, and Purkinje fibers

Question 11

What does the PR interval represent?

Answer 11

The time it takes for the electrical impulse to travel from the atrium to the AV node, aka timed value of atrial depolarization

Question 12

What does the QRS complex represent?

Answer 12

Ventricular depolarization mainly, but also hides atrial repolarization

Question 13

What do the ST segment and T wave represent?

Answer 13

Time for ventricular repolarization

Question 14

What does the QT interval represent?

Answer 14

Time for ventricles to depolarize AND repolarize, aka contraction and relaxation