What’s the difference between a pacemaker and an ICD?

Pacemaker (PPM)

 

Cardiac resynchronization therapy (CRT) Implantable cardiac defibrillator (ICD)
Function Generate a new pacing node Bi-ventricular pacing Defibrillate in case of VT/VF
Associated with… Sick sinus syndrome, afib CHF, conduction disease (ventricular dysynchrony) CHF
Indications Chronic afib with symptomatic bradycardia CHF with EF <35% and NYHA class III-VI symptoms, new LBBB with QRS >150 msec CHF with EF <35%
Where are the leads? Subcutaneous or internal

-single chamber: 1 lead in the RA or RV
-dual chamber: 2 leads, in the RA and RV (thought to resemble natural rhythm more, there are pros/cons)
– triple pacemaker: less common, 3 leads in RA/RV/LV

Lead in the RV, LV 1 lead that may extend into the RA and RV
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