EKG Principles : Nursing Course


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OR REVIEW THE FOLLOWING NURSING CLASS KNOWLEDGE BLOCKS


A normal regular rhythm of the heart is:

sinus rhythm

Rationale: A normal sinus rhythm is a rhythm that is regular, with a rate of 60-100 beats per minute. There is a P wave present, that is upright, uniform, and round. The PR interval is 0.12 - 0.20 seconds, and the QRS complex is less than 0.12 seconds.


When interpreting an EKG rhythm, the P wave represents:

atrial depolarization

Rationale: Depolarization is considered to be the action state in the heart, and repolarization is the resting state. During depolarization and repolarization, four main electrolytes, sodium, potassium, calcium, and chloride move across the cardiac cell membrane. The P waves on an EKG strip represent atrial depolarization. When evaluating an EKG, the P waves should be small positive deflections that extend above the isoelectric line. On a normal EKG, the P waves are rounded, uniform, and upright. They come before the QRS complex. These waves are either regular or irregular, and the measured distances between all P waves should be constant.


When interpreting an EKG, ventricular depolarization is reflected by the:

QRS interval

Rationale:

Any rhythm that is not normal sinus rhythm is considered a:

dysrhythmia

Rationale:

A heartbeat that originates in an abnormal place in the heart is an:

ectopic beat

Rationale:

The pacemaker of the heart is the:

sinoatrial node (SA node)

Rationale:

The regularity of a heart rhythm is determined by looking at the:

R-R interval

Rationale:

When evaluating an EKG rhythm, any interference that makes the rhythm difficult to interpret is considered:

artifact

Rationale:

When calculating the heart rate for a patient, count the QRS complexes that are present on an EKG strip every:

6 seconds

Rationale:

When determining the name of a cardiac rhythm, the first portion of the name is based on:

the node that the rhythm originated in

Rationale:

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