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Ectopic Complexes: Difference between revisions
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[[Image:Rhythm_premature.png|thumb| An [[Atrial_Premature_Complexes|atrial]] with a noncompensatory pause.]] | [[Image:Rhythm_premature.png|thumb| An [[Atrial_Premature_Complexes|atrial]] with a noncompensatory pause.]] | ||
[[Image:Rhythm_ventricular_premature.png|thumb|A [[Premature ventricular beats(PVB) / Venticular extrasystoles (VES)|ventricular extrasystole]] with a compensatory pause]] | [[Image:Rhythm_ventricular_premature.png|thumb|A [[Premature ventricular beats(PVB) / Venticular extrasystoles (VES)|ventricular extrasystole]] with a compensatory pause]] | ||
[[Image:pacemaker_rates. | [[Image:pacemaker_rates.svg|thumb|Mycoardial cells with pacemaker activity]] | ||
The pacemaker cells in the sinus node are not the only cells in the heart that can depolarize spontaneously. Actually all cardiomyoctyes have this capacity. The only reason why the sinus node 'rules' is that it is the fastest pacemaker of the heart. All healthy cardiomyocytes from the sinus node to the ventricles can function as ectopic pacemakers. Ectopic pacemaker activity can originate from the atria (60-80 bpm), AV-node (40-60 bpm) and the ventricles (20-40 bpm). So, as the sinus rate drops (e.g. during atrial infarction), other cells can take over. The configuration of ectopic | The pacemaker cells in the sinus node are not the only cells in the heart that can depolarize spontaneously. Actually all cardiomyoctyes have this capacity. The only reason why the sinus node 'rules' is that it is the fastest pacemaker of the heart. All healthy cardiomyocytes from the sinus node to the ventricles can function as ectopic pacemakers. Ectopic pacemaker activity can originate from the atria (60-80 bpm), AV-node (40-60 bpm) and the ventricles (20-40 bpm). So, as the sinus rate drops (e.g. during atrial infarction), other cells can take over. The configuration of ectopic complexes, or extrasystoles, as seen on the ECG, reveals its origin, whether they are [[Atrial_Premature_Complexes|atrial]], nodal or [[ves|ventrical]]. | ||
==Ectopic pacemakers== | ==Ectopic pacemakers== | ||
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==Compensatory or noncompensatory pause== | ==Compensatory or noncompensatory pause== | ||
[[File:comppause.svg|thumb|A ladder diagram showing a non-compensatory pause following an atrial premature beat that resets the sinus node and fully compensatory pause following a ventricular premature beat that does not reach the sinus node.]] | |||
The duration of the interval following a premature complex can help in the differentiation of a atrial or ventricular premature complex. | The duration of the interval following a premature complex can help in the differentiation of a atrial or ventricular premature complex. | ||