Overview

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.


Sinoatrial Block Features

Look for rhythm that is irregular when sa block occurs, with heart rate that is normal or slow. Notice that the P wave is normal. The PR interval is normal (0.12-0.20 sec). The QRS is normal (0.06-0.10 sec).
RhythmIrregular when SA block occurs
RateNormal or slow
P WaveNormal
PR IntervalNormal (0.12-0.20 sec)
QRSNormal (0.06-0.10 sec)
NotesPause time is an integer multiple of the P-P interval Try to identify specific type of atrial tachycardia - see other pages








Sinoatrial Block Tracing

Sinoatrial Block tracing
Pause (missed beat)
electronic calipers for EKG strip





Caliper Time Interval: ___ seconds






More Training Tools - Practice Strips, Tutorial & Quiz

EKG Practice Strips

Users are asked to identify the EKG's using a rhythm strip. Electronic calipers are available. After each answer, immediate feedback and coaching is available.

EKG Practice Strips

EKG Tutorial

Need a basic EKG course? Essential ECG features are explained along with step-by-step analysis techniques. Rhythm strip exercises provide learning reinforcement.

EKG Tutorial

ECG Quiz

Users are given twenty tracings to analyze. At the end of the quiz, answers are scored and compared to mean and top scores for all recent website visitors.

ECG Quiz

mobile edition of Practical Clinical Skills website
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