Learning Heart Arrhythmias Part 02

Posted by e-Medical PPT Saturday, June 12, 2010

Supraventricular tachycardia (SVT) is any tachycardic rhythm originating above the ventricular tissue.supraventricular tachycardia includes abnormal sinus tachycardia, ectopic atrial tachycardia , atrial fibrillation/atrial flutter and junctional tachycardia(AV nodal reentrant tachycardia and AV reentrant tachycardia - Wolff-Parkinson-White syndrome).
Most supraventricular tachycardias have a narrow QRS complex on ECG, but it is important to realise that supraventricular tachycardia with aberrant conduction can produce a wide-complex tachycardia that may mimic ventricular tachycardia.
Atrial fibrillation characteristically has an "irregularly irregular rhythm" both in its atrial and ventricular depolarizations. It is distinguished by fibrillatory P-waves that, at some point in their chaos, stimulate a response from the ventricles in the form of irregular, narrow QRS complexes.
Atrial flutter, is caused by a re-entry rhythm in the atria, with a regular rate of about 300 beats per minute. On the ECG, this appears as a line of "sawtooth" P-waves. The AV node will not usually conduct such a fast rate, and so the P:QRS usually involves a 2:1 or 4:1 block pattern.


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