Cardiac Rhythms : Nursing Course


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OR REVIEW THE FOLLOWING NURSING CLASS KNOWLEDGE BLOCKS


The width of the QRS complex on an EKG strip for a patient in sinus rhythm is:

0.04-0.12

Rationale: The QRS complex is the name of the Q wave, R wave, and S wave that appears in rapid succession on an EKG strip. The QRS complex represents ventricular depolarization of the heart. The QRS complex should measure 0.04-0.12 seconds on a EKG strip, which is 3 small boxes. When the QRS is wider than normal, this is an indication of right or left bundle branch block.


The normal width of the PR interval on an EKG strip is:

0.12- 0.20

Rationale: The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. On an EKG strip, this measurement is 3 to 5 small boxes. The PR interval is a measurement of the amount of time it takes for an electrical impulse to travel from the sinus node in the heart, to the ventricles. When a PR interval is greater than .20 seconds, it is an indication of a first degree heart block.


When a patient is in normal sinus rhythm, the heart rate will range from:

60-100 beats per minute

Rationale:

The absence of electrical and mechanical activity in the heart is:

asystole

Rationale:

A heart rhythm in which the atrium is not contracting, resulting in an irregular rhythm and absent P waves is:

atrial fibrillation

Rationale:

A cardiac rhythm in which there is flutter waves present on an EKG, with a rapid rate and absent P waves is:

atrial flutter

Rationale:

A sinus rhythm in which the heart rate is less than 60 beats per minute is:

sinus bradycardia

Rationale:

A patient that is in a sinus rhythm, but with a heart rate greater than 100 beats per minute is in:

sinus tachycardia

Rationale:

The most serious cardiac rhythm, in which the lower chambers of the heart quiver and can't pump blood is:

ventricular fibrillation

Rationale:

Any rhythm faster than 100 beats per minute with more than 3 irregular beats in a row is:

ventricular tachycardia

Rationale:

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