1. Irregular Rhythms
Junctional Tachycardias. Ventricular Tachycardias. During an arrhythmia, the heart may beat too rapidly, a situation called tachycardia; too slowly, a situation called bradycardia; or it may beat irregularly.
http://www.txai.org/edu/irregular/irregular_rhythms.htm

2. Nurse Bob's MICU/CCU Survival Guide
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http://rnbob.tripod.com/

3. Reentrant Supraventricular Tachycardias (SVT, PSVT): Arrhythmias and Conduction Disorders: Merck ...
However, if the mechanism of the tachycardia is unknown, ventricular tachycardia has not been excluded, and AV nodal blockers should be avoided because they may worsen ventricular tachycardias. QRS complex is narrow except with coexisting bundle...
http://www.merck.com/mmpe/sec07/ch075/ch075g.html