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114 Stratos LV/LV-T Technical Manual
In addition to the detection rate, an AF is classified using X-out-
of-8 algorithm of mode switching. If mode switching is not
programmed, the standard setting of 5-out-of-8 is used.
In the statistics, the AF duration (1 min, 10 min, 60 min 4 h, 12 h,
24 h, 48 h, > 48 h) as well as the AF start time (0-3 hours, 3-6
hours, 6-9 hours, 9-12 hours, 12-15 hours, 15-18 hours, 18-21
hours, 21-24 hours) are shown in the histograms.
2.21.3 AES Statistics
This function enables long-term recording and analysis of atrial
extrasystoles (AES events). An atrial event is classified as an
atrial extra systole (AES) if it falls in the AES window. This AES
window begins after the absolute atrial refractory period and
ends at a programmable Atrial Prematurity percentage of the
average of the last four P-P intervals.
AT/AES Classification
The Stratos CRT-Ps classify AES events that occur according to
their complexity. The following information is available when
AES statistics are enabled.
Class Corresponding to Additional Criteria
AF Atrial Fibrillation unstable rate and x out of 8 criteria
AFl Atrial Flutter stable rate
AT Atrial Tachycardia Sudden onset
Additionally, the following accelerations between zones are
reported.
AFl to AF AT to AFl
AT to AF SR to AT
The AES events are classified according to their complexity in
one of the following classes.
Class Event Sequence
Single AES A-AES
Couplets A-AES-AES
Triplets A-AES-AES-AES
The average number of AES per hour and the shortest AES-AES
interval are also reported.