Ectopic Complexes: Difference between revisions

Ectopic Complexes (view source)

Revision as of 15:16, 23 July 2007

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 ===Premature atrial complex / atrial extrasystole===
-[[Image:Rhythm_premature.png|thumb| A premature atrial complex (PAC). (In this example the atrial p-wave is difficult to discern).]]
+{{: Premature Atrial Complexes}}
-[[Image:Bes.png|thumb| A premature atrial complex (PAC) with evident negative p-wave]]
-Premature atrial complexes origin from an ectopic pacing region in the atria. The result is a p-wave with often a different morphology as the preceding ones.
-{{clr}}
 ===AV-nodal complexes===
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 ===Ventricular premature beat (VPB) / Ventricular extrasystole (VES)===
-[[Image:Rhythm_ventricular_premature.png|thumb| The arrow indicates a ventricular extrasystole (VES).]]
+{{: Ventricular Premature beats}}
-A VPB is an ectopic beat that origins from the ventricles. VPBs are hardly conducted by the specialised conduction system and therefore are broad. The QRS width is at least > 0.12 seconds, but often very broad at around 0.16-0.20 seconds.
-Causes: e.g. ischemia, hypoxia, old scar tissue, idiopathic. 50% of healthy men have sporadic VPBs.
-The origin of the VPB can be derived from its form. A LBTB-configured VPB originates in the right ventricle. A RBTB-configured VPB comes from the left ventricle. The QRS duration of a VPB is > 0.12 seconds and can be as wide as 0.16-0.20 seconds.
-A sequence of three or more extrasystoles is called a [[#ventricular tachycardia|non-sustained ventricular tachycardia]].
-If more than one VPB is present on the ECG, they can be:
-*'''monomorphic''': all VPBs have the same configuration and thus have a mutual focus of origin.
-*'''multiformic''': the complexes have different configurations.
-{{clr}}
 ===Bigemini===