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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.

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Mintek Pacemaker LV-T Manual de usuario Pagina 122