Document Detail

Loss of atrial signal detection with increasing sensitivity settings: a software problem and its practical solution.
MedLine Citation:
PMID:  1710057     Owner:  NLM     Status:  MEDLINE    
A logic error in the software of Cosmos II results in apparent malsensing of atrial signals at high rather than low sensitivity settings. The paradoxical function was found in 54 out of 87 units tested (= 62%) if the atrial sensitivity was increased and in 54 out of 87 units tested (= 62%) if the atrial sensitivity was increased and the ventricular refractory period was lengthened beyond critical limits that could be defined individually. The problem inherent in both unipolar (66%) and bipolar systems (54%) is attributed to a summation of a physiological signal and internal noise, which has to be detected at the atrial level within a specific timing window to disable atrial sensing for the next pacing cycle. The malfunction virtually disappears if the ventricular refractory period does not exceed 210 msec. It is recommended, therefore, that Cosmos II pacemakers be left at their nominal ventricular refractory value (200 msec).
G Fröhlig; H Schwerdt; M Berg; S Spitzer; H Schieffer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  14     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1991 Apr 
Date Detail:
Created Date:  1991-06-28     Completed Date:  1991-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  522-8     Citation Subset:  IM    
Medizinische Universitätsklinik, Innere Medizin III, Homburg, Germany.
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MeSH Terms
Aged, 80 and over
Atrioventricular Node / physiopathology*
Cardiac Pacing, Artificial / methods*
Heart Block / therapy
Middle Aged
Pacemaker, Artificial*
Refractory Period, Electrophysiological / physiology
Sinoatrial Block / therapy
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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