Accelerated idioventricular rhythm: Difference between revisions
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Revision as of 23:48, 25 December 2008
| Accelerated idioventricular rhythm | |
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| Specialty | Cardiology  |
In accelerated idioventricular rhythm, the rate of cardiac contraction is determined by the intrinsic rate of depolarisation of the cardiac cells.
It can be present at birth.[1]
Pathophysiology
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]
Appearance
AIVR appears similar to ventricular tachycardia but is benign and doesn't need any treatment. It can most easily be distinguished from VT in that the rate is less than 120 and usually less than 100 bpm.
References
- ^ Freire G, Dubrow I (2008). "Accelerated idioventricular rhythm in newborns: a worrisome but benign entity with or without congenital heart disease". Pediatr Cardiol. 29 (2): 457–62. doi:10.1007/s00246-007-9024-z. PMID 17687587.
{{cite journal}}: Unknown parameter|month=ignored (help) - ^ "Accelerated Idioventricular Rhythm: Overview - eMedicine". Retrieved 2008-12-21.
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