Accelerated idioventricular rhythm overview: Difference between revisions
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# Usually occurs during [[sinus bradycardia]]. | # Usually occurs during [[sinus bradycardia]]. | ||
# May also be caused by digitalis. | # May also be caused by digitalis. | ||
==References== | ==References== | ||
Revision as of 20:02, 22 August 2012
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Accelerated idioventricular rhythm Microchapters |
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Differentiating Accelerated idioventricular rhythm from other Diseases |
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Diagnosis |
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Treatment |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
The rate of cardiac contraction is determined by the intrinsic rate of depolarisation of the cardiac cells. In normal hearts the sinoatrial node in the atria depolarises at a rate of 70 beats per minute. This suppresses the intrinsic depolarisation of the other parts of the heart.
The accelerated idioventricular rhythm occurs when depolarisation rate of a normally suppressed focus increases to above that of the "higher order" focuses (the sinoatrial node and the atrioventricular node). This most commonly occurs in the setting of a sinus bradycardia.[2]
Accelerated Idioventricular Rhythms are ectopic ventricular rhythms at rates between 40 bpm and 100 to 120 bpm. The ventricular origin of this rhythm can be demonstrated by the usual EKG criteria which include AV dissociation, fusion, and capture complexes.
Clinical Correlate
- Seen in both AMIs and IMIs.
- Commonly seen following reperfusion.
- Usually occurs during sinus bradycardia.
- May also be caused by digitalis.