MONITORING M ODES
VF8 DELTA/DELTA XL/KAPPA 24-5
Monitoring Modes
Single Twitch Mode
In this mode, the pod sends a single stimulation pulse and
measures the magnitude of the resulting muscle twitch. The
pod then calculates an NMT value (from 0 to 100 %) by
comparing this magnitude to that of the previously
established reference twitch (see page 24-2). For example:
If the displayed value is 79, the magnitude of the measured
twitch was 79 % of that of the reference twitch.
A bar graph in the NMT parameter box indicates the
relative magnitude of the twitch. The pod repeats the
stimulation automatically at regular, menu-selectable
intervals (default is 20 seconds).
If the pod is unable to establish a reference twitch, it uses an
internal reference value for single-mode measurements.
Train-of-Four (TOF)
In this mode (default), the pod sends a sequence of four
stimulation pulses 0.5 seconds apart and measures the
magnitude of the resulting muscle twitch after each
individual pulse. The pod then calculates a TOF response
value (TOF-ratio, from 4 to 100 %) using the ratio between
the fourth twitch and the first twitch. A bar graph in the
NMT parameter box indicates the relative magnitude of each twitch. The pod repeats
this stimulation sequence automatically at regular, menu-selectable intervals (default
is 20 seconds).
When fewer than four twitches are detected, the monitor
displays a TOF-Count (TOF-Cnt) value instead, which
represents the number of responses to the four TOF
stimulation pulses.
CAUTION: NMT stimulation can be painful to a non-sedated patient. Do not stimulate
before adequate sedation.
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