Document Detail

Undersensing by an ICD Due to Alternans of the Ventricular Electrogram.
MedLine Citation:
PMID:  23347031     Owner:  NLM     Status:  In-Data-Review    
Alternans of the ventricular electrogram (VEGM) during ventricular tachycardia (VT) is a rare cause of ventricular undersensing by an implantable cardioverter-defibrillator (ICD). This report describes a patient with a St. Jude ICD who exhibited sustained monomorphic VT associated with surface QRS alternans, alternating cycle lengths, alternans of the VEGM causing intermittent undersensing of the smaller component, and intermittent 2:1 counting of ventricular intervals during 1:1 sensing in response to the ICD detection algorithm. VEGM undersensing was corrected noninvasively simply by programming the threshold start from 62.5% to 50% which increased the sensitivity based on the amplitude of the VEGM. This maneuver did not affect the satisfactory and stable defibrillation threshold.
Frederic E Van Heuverswyn; Liesbeth Timmers; Roland X Stroobandt; S Serge Barold
Publication Detail:
Type:  Journal Article     Date:  2012-08-13
Journal Detail:
Title:  Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc     Volume:  18     ISSN:  1542-474X     ISO Abbreviation:  Ann Noninvasive Electrocardiol     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9607443     Medline TA:  Ann Noninvasive Electrocardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  84-9     Citation Subset:  IM    
Copyright Information:
©2012, Wiley Periodicals, Inc.
Heart Center, University Hospital Ghent, Ghent, Belgium.
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