User's Manual

102
Diagnostic Memory Functions (Statistics)
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The tachy event trend is automatically started by activating the mode
switching function. The memory contents are deleted and the memory
function is restarted with every permanent programming and every
restart of the mode switching function. It is not possible to manually
switch off the tachy event trends while the mode switching function is
activated.
The beginning and end times of the tachycardias are saved with a
resolution of 2 seconds. The counter evaluates tachy episodes within
the entire follow-up time period.
Note: When the elective replacement indication (ERI) has
been attained, the content of the tachy event
trends as well as all other memory contents are
"frozen," and recording is stopped.
When Are Atrial Sense Events Classified as AES?
AES Classification
The basis for evaluating whether an atrial extrasystole (AES) has
occurred is provided by the atrial extrasystole value window (AESW).
The objective of the absolute atrial refractory period (AARP) is to
simulate the natural refractory period in the atrium. Atrial events
occurring during AARP are not classified as AES. The AARP is
shortened dynamically as the rate increases. The AESW is limited by
an AARP and an atrial prematurity.
The window of time for an AES cannot exceed a maximum interval
length of 800 ms. An atrial sense event that is detected 800 ms or
more after the last atrial event is no longer classified as an AES.