EKG Principles : Nursing Course


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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.


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

R-R interval

Rationale: The time intervals between consecutive heart beats are measured on an EKG strip by measuring from the beginning of a QRS complex to the beginning of the next QRS complex,known as the R-R interval. When analyzing the regularity of a heart rhythm, it is vital to evaluate the atria and the ventricles. The regularity of the atrials is assessed by looking at the patterns of the P waves, and the ventricles are evaluated by assessing the regularity of the R waves. The intervals from R to R on an EKG strip can determine if a rhythm is regular or irregular. A regular rhythm means that the distance between the beats is the same.


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

ectopic beat

Rationale:

When interpreting an EKG rhythm, the P wave represents:

atrial depolarization

Rationale:

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

QRS interval

Rationale:

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

6 seconds

Rationale:

The pacemaker of the heart is the:

sinoatrial node (SA node)

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:

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

artifact

Rationale:

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

dysrhythmia

Rationale:

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