1. 
   pacemaker-mediated tachycardia
   tachycardia in a patient with a dual chamber pacemaker, caused by retrograde conduction of ventricular impulses (either premature ventricular complexes or impulses that are triggered by ventricular pacing), which are sensed by the atria and trigger a subsequent ventricular impulse, sometimes leading...
   Found op http://www.encyclo.co.uk/local/21001
   
   

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