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Sinoatrial Block | Reference Guide


EKG Strip

ecg rhythm strip for reference guide


EKG Features

Rate: Normal or slow
Rhythm: Irregular when SA block occurs
P Wave: Normal
PR Interval: Normal (0.12-0.20 sec)
QRS: Normal (0.06-0.10 sec)

In sinoatrial block, the impulse is delayed or blocked on the way to the atria. This creates a dropped beat which is a multiple of the P-P interval. After the dropped beat, the rhythm continues regularly. There are three types of SA blocks, based upon the length of the delay.
External Source: http://connects.catalyst.harvard.edu/Profiles/display/Concept/Sinoatrial%20Block
Harvard Med School Catalyst


Authors and Reviewers

Authored by Thomas O'Brien
EKG tracings reviewed by Dr. Pedro Azevedo, MD, Cardiology
Medically reviewed by Dr. Jonathan Keroes, MD, Cardiology
Last Update: 11/8/2021

Sources



Return to EKG Reference Guide Index


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