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==Pacemakers== | ==Pacemakers== | ||
[[Image: |right]] | [[Image:SchematicImg.jpg|right|thumb|300px|Schematic display of a pacemaker.]] | ||
A pacemaker monitors the electrical impulses in the heart. When needed, it sends small electrical impulses to the heart muscle to maintain a normal heart rate. | A pacemaker monitors the electrical impulses in the heart. When needed, it sends small electrical impulses to the heart muscle to maintain a normal heart rate. | ||
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===Explanations of table:=== | ===Explanations of table:=== | ||
====III==== | ====III:==== | ||
=====Triggered:===== | =====Triggered:===== | ||
A sensed event triggers a pacemaker output pulse | A sensed event triggers a pacemaker output pulse | ||
=====Inhibited:===== | =====Inhibited:===== | ||
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==Complications== | ==Complications== | ||
===Undersensing:=== | ===Undersensing:=== | ||
[[Image:Ventricular undersensing.svg|right|thumb|300px]] | [[Image:Ventricular undersensing.svg|right|thumb|300px|Ventricular undersensing. Failure of appropriate ventriculation inhibition]] | ||
An intrinsic depolarization that is present, is not sensed by the pacemaker. This can be due to: | An intrinsic depolarization that is present, is not sensed by the pacemaker. This can be due to: | ||
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===Oversensing:=== | ===Oversensing:=== | ||
[[Image:Ventricular oversensing.svg|right|thumb|300px]] | [[Image:Ventricular oversensing.svg|right|thumb|300px|Ventricular oversensing. Failure of appropriate ventricular firing]] | ||
The pacemakers senses signals on the marker channel that do not correspond to the ECG pattern. This can be physiologic (e.g. ventricular pulse or myopotentials) or non-physiologic (e.g. lead fracture or if the lead is loose from the pacemaker pulse generator or outside interference such as TENS therapy or surgical diathermy). | The pacemakers senses signals on the marker channel that do not correspond to the ECG pattern. This can be physiologic (e.g. ventricular pulse or myopotentials) or non-physiologic (e.g. lead fracture or if the lead is loose from the pacemaker pulse generator or outside interference such as TENS therapy or surgical diathermy). | ||