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32 terms

Pacemaker Rhythms

ECGs Made Easy Third Edition CHAPTER 8
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output
electrical stimulus delivered by a pacemaker's pulse generator
threshold
the minimum amount of voltage (mA) needed to obtain consistent capture
rate modulation
ability of a pacemaker to increase the pacing rate in response to physical activity or metabolic demand
fusion beat
ECG waveform that results when an intrinsic depolarization and a pacing stimulus occur simultaneously and both contribute to depolarization of that cardiac chamber
pulse generator
power source that houses the battery and controls for regulating a pacemaker
demand pacemaker
discharges only when the patient's heart rate drops below the pacemaker's preset rate
V-A interval
in dual-chamber pacing, the interval between a sensed or ventricular-paced event and the next atrial-paced event
capture
successful depolarization of the atria and/or ventricles by an artificial pacemaker
pacemaker spike
a vertical line on the ECG that indicates the pacemaker has discharged
base rate
rate at which the pulse generator of a pacemaker paces when no intrinsic activity is detected; expressed in pulses per minute
A-V interval
in dual-chamber pacing, the length of time between an atrial sensed or atrial paced event and the delivery of a ventricular pacing stimulus; analogous to the P-R interval of intrinsic waveforms
escape interval
time measured between a sensed cardiac event and the next pacemaker output
atrial pacemaker
a pacing system with a lead attached to the right atrium designed to correct abnormalities in the SA node
dual-chamber pacemaker
pacemaker that stimulates the atrium and ventricle
inhibition
pacemaker response in which the output pulse is suppressed when an intrinsic event is sensed
AV sequential
pacemaker that stimulates firse the atrium, then the ventricle
fusion beat
in pacing, the ECG waveform that results when an intrinsic depolarization and a pacing stimulus occur simultaneously
capture
ability of a pacing stimulus to successfully depolarize the cardiac chamber that is being paced
base rate
rate at which the pulse generator paces when no intrinsic activity is detected
atrial pacing
pacing system with a lead attached to the right atrium
pacemaker
artificial pulse generator that delivers an electrical current to the heart to stimulate depolarization
ventricular pacing
pacing system with a lead attached in the right ventricle
pacing system analyzer
external testing and measuring device capable of pacing the heart during pacemaker implantation
interval
period, measured in milliseconds, between any two designated cardiac events
asynchronous
another name for a fixed-rate pacemaker
milliampere
unit of measure of electrical current needed to elicit depolarization of the myocardium
V V
interval between two ventricular-paced events
synchronous
another name for demand pacemaker
bipolar lead
pacing lead with two electrical poles that are external from the pulse generator
pacing interval
period, expressed in milliseconds, between two consecutive paced events in the same cardiac chamber without an intervening sensed event
unipolar lead
pacing lead with a single electrical pole at the distal tip of the pacing lead (negative pole) through which the stimulating pulse is delivered
sensing
ability of a pacemaker to recognize and respond to intrinsic electrical activity; the pacemaker's response to sensed activity depends on its programmed mode and parameters