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Stratos LV/LV-T Technical Manual  115 

Information about the number of AES events as a function of the 
atrial rate can be found in the AES vs Atrial Rate Histograms. 

For Stratos 

CRT-Ps, single AES bar chart displays the 

percentage of specific AES in 17 different rate ranges (< 40 ppm 
to > 180 ppm).  The atrial rate of the last interval before the AES 
serves to classify the AES.   

Two sequential AES are saved as a couplet, and three 
sequential AES are saved as a triplet. 

The AES coupling interval shows in which millisecond range the 
prematurity (distance As/Ap to AES) has occurred.  The intervals 
of the AES-AES Sequences are displayed from < 200 to 1040 
ms in 24 histograms classes.  The graphic display shows the 
percentage values if the individual classes in the form of a bar 
chart and the total number of events. 

The detected VES are ventricular events outside of the AV delay 
and the VER discrimination interval after As. 

Therefore, it is recommended that the atrial sensing be stable 
before activating the VES analysis.  If the atrial lead is bipolar, 
bipolar sensing should be considered. 

•  0-25% (premature VES-VES from 750 to 1000 ms at 60 

ppm in the preceding interval). 

•  25-50% (premature for VES-VES from 500 to 750 ms at 

60 ppm in the preceding interval). 

•  >50%(premature for VES-VES from < 500 ms at 60 ppm 

in the preceding interval) 

 

The VES sequence histogram also displays single VES’, 
couplets, triplets, runs and VT episodes.