Ventricular Premature Beats: Difference between revisions

From ECGpedia
Jump to navigation Jump to search
mNo edit summary
mNo edit summary
Line 11: Line 11:
*'''monomorphic''': all VPBs have the same configuration and thus have a mutual focus of origin.
*'''monomorphic''': all VPBs have the same configuration and thus have a mutual focus of origin.
*'''multiformic''': the complexes have different configurations.  
*'''multiformic''': the complexes have different configurations.  
;Bigemini
:Every sinus beat is followed by a ventricular extrasystole.
[[Image:Rhythm_bigemini.png|thumb|Bigemini: every sinus beat is followed by a ventricular extrasystole]]
;Trigemini
Every second sinus beat is follow by a ventricular extrasystole.
Three or more consecutive VPBs are called a [[non-sustained ventricular tachycardia]]
{{clr}}
{{clr}}

Revision as of 15:24, 23 July 2007

This is part of: Ventricular Arrhythmias
The arrow indicates a ventricular extrasystole (VES).

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 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.
Bigemini
Every sinus beat is followed by a ventricular extrasystole.
Bigemini: every sinus beat is followed by a ventricular extrasystole
Trigemini

Every second sinus beat is follow by a ventricular extrasystole.

Three or more consecutive VPBs are called a non-sustained ventricular tachycardia