User's Manual

101
Diagnostic Memory Functions (Statistics)
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Arrhythmia Statistics
The pacemaker monitors the cardiac rhythm and characterizes it
according to the following classification criteria:
— SR (sinus rhythm)
— ST-AT range (sinus tachycardia/atrial tachycardia)
— Afl/AF range (atrial flutter/atrial fibrillation)
Arrhythmia detection does not occur at any individual interval, but
rather within arrhythmia ranges with suitable criteria. These criteria
are described below.
Mode Switching
The tachy event trend can only be selected for the following modes:
—
DDD(R) and DDD(R)
+
— VDD(R)
—
DDT(R)/A and DDT/A(R)
+
—
DDT(R)/V and DDT/V(R)
+
If this is not taken into account, a corresponding error message
appears on the screen of the programming device. The tachy event
trend can only be selected when mode switching has been set. The
tachy event trend registers atrial tachycardias (PAT) that are
recognized by the pacemaker and lead to mode switching. The last
atrial tachycardias (up to 64) are recorded. Several consecutive mode
switching events within 45 sec triggers recording of a tachy event.
The tachy event trend displays the atrial tachycardia events graphically
as a function of time. The respective date and time at the beginning
and end of the tachycardia events are also printed out. This documents
both the frequency and length of the tachycardia periods, which can be
evaluated at follow-up.