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*Treats chronic and acute conduction defects (3rd degree block, bradydysrhythmias, tachydysrhythmias).

Single-Chamber Pacing

*Only atria or ventricle passed, not both.


*Electrical stimulus delivered by generator.


*Insulated wire.

Dual-Chamber Pacing

*Atria and ventricles passed.

Demand Pacing

*Pacing stimulus delivered only when patient's heart rate is below base rate.


*Ability of pacing stimulus to generate cardiac depolarization.

Base Rate

*Rate at which pacemaker paces when no cardiac activity is sensed.

Asynchronous Pacing

*Pacing stimulus at set rate regardless of heart rate.

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