one lead 
atrium or ventricle
may be used for patients in chronic AF (VVI) or sinus node dysfunction and no history of AV block (AAI)

one lead atrium or ventricle may be used ________

Week 3 types of pacemakers

2 leads 
in atrium and ventricle 
provides AV synchrony and pacing support in both atrium and ventricle

3 leads 
RA, RV, LV
paces both ventricles together to resynchronize the beat

fixed rate pacing in the ventricle 
intrinsic ventricular events are not sensed in this mode (pacing interval not interrupted)

ventricular sensed event will: 
interrupt pacing interval 
reset lower rate timer 
inhibit next scheduled pace

allows normal AV conduction in the absence of AV block

fixed rate pacing in the atrium and the ventricle 
intrinsic atrial and ventricle events are not sensed in this mode (pacing interval is not interrupted)

atrial sense inhibits next scheduled atrial pace
restarts lower rate timer 
triggers a sensed AV interval 

atrial pace restarts the lower rate timer 
triggers a paced AV interval 

a ventricular sense inhibits the next scheduled ventricular pace 

best to provide AV synchrony

able to trigger a ventricular pacing output in response to an intrinsic P wave (P wave tracking)
able to inhibit a ventricular pacing output in response to an intrinsic QRS complex 
no atrial pacing, patient must have normal sinus node function

never trigger (start) an AV delay following an intrinsic P wave (no P wave tracking) 
similar to combining AAI and VVI modes 
used primarily for atrial tachyarrythmias and mode switching 
A flutter

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Week 3 types of pacemakers Flashcards

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