Friday, October 21, 2011

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First degree atrioventricular block - ECG

In this condition, there is a delay in conduction between the atria and the ventricles. There is a prolongation of the PR interval to more than 200 ms. i.e > 5 small squares on a usual 25 mm/s ECG tracing. The normal duration for PR interval is 120 - 200 ms.
A QRS complex follows each P wave and the PR interval is relatively constant from beat to beat.
The pathology is usually due to a delay within the AV node if we have a normal QRS complex. But if the QRS complex is wide, the problem is more distal.


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