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.