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Basic Pacing Concepts Part III - page 20 / 49

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A Wire Fracture Can Cause Both Undersensing and Oversensing

Undersensing occurs when the cardiac signal is unable to get back to the pacemaker – intrinsic signals cannot cross the wire fracture

Oversensing occurs when the severed ends of the wire intermittently make contact, which creates potentials interpreted by the pacemaker as P or R waves

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