Junctional escape beat
Medical condition
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Related on Lably
Through Cardiac cycle and Cardiac output
Signs and symptoms
Junctional rhythms (if a bradycardia) can cause decreased cardiac output. Therefore, the person may exhibit signs and symptoms similar to other bradycardia such as lightheadedness, dizziness, low blood pressure, and fainting. This rhythm can usually be tolerated if the rate is above 50 beats per minute.
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Cause
A junctional escape complex is a normal response that may result from excessive vagal tone on the SA node (e.g. digoxin toxicity), a pathological slowing of the SA discharge, or a complete AV block.
Diagnosis
- Rate: 35–60 bpm
- Rhythm: Irregular in single junctional escape complex; regular in junctional escape rhythm.
- P waves: Depends on the site of the ectopic focus. They will be inverted, and may appear before or after the QRS complex, or they may be absent, hidden by the QRS.
- P-R interval: If the P wave occurs before the QRS complex, the interval will be less than 0.12 seconds.
- QRS Complex: Usually normal in duration and morphology, less than 0.12 seconds.
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