BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 71 / 176

Lumax Technical Manual 63
LV T-wave Protection - Used to eliminate unintended pacing in
the vulnerable period of the left ventricle. This feature is only
used when left ventricular sensing is active.
HF versions only.
2.3 Automatic Threshold Measurement
(ATM)
Lumax 500/540 Models only
The Lumax 500/540 models have automatic threshold
measurement (ATM) feature for determining ventricular pacing
thresholds. This feature is separately programmable for the right
(RV) and left (LV) ventricles.
ATM is initiated once each day, typically during the nighttime while
the patient is normally sleeping. It can measure the right and the
left ventricular pacing thresholds and stores this information for
use in trends of daily threshold values. This information is
available on the programmer during in-office follow-ups and via
BIOTRONIK’s Home Monitoring system. The permanent pacing
amplitude is not adjusted by the ATM feature.
2.3.1 Functional Description
The ATM features of Lumax 500/540 are based on the evaluation
of the morphology of the ventricular evoked response (VER) to
determine if the pacing pulse has captured the myocardium. In
order to measure the pacing threshold, a sequence of two
algorithmic steps is carried out:
•
Signal Quality Check (SQC)
•
Threshold Measurement