Cardiac Rhythms : Nursing Course


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OR REVIEW THE FOLLOWING NURSING CLASS KNOWLEDGE BLOCKS


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.


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

ventricular tachycardia

Rationale: Ventricular tachycardia (v-tach) refers to any rhythm faster than 100 beats per minute, with 3 or more irregular beats in a row. V-tach is the cause of most sudden cardiac deaths in the United States. The symptoms of ventricular tachycardia include palpitations, syncope, and chest pain. On an EKG strip, v-tach appears as U-shaped waves, and are easily identifiable. A patient may or may not have a pulse with v-tach. A patient will always need immediate treatment for v-tach, but the type of treatment will depend on if a pulse is present or not. Treatment will range from medication to defibrillation.


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

sinus tachycardia

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

sinus bradycardia

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:

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:

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

ventricular fibrillation

Rationale:

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

0.04-0.12

Rationale:

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