Overview Of Nmt Monitoring; Supported Parameters; Supported Modes; Supported Settings - Dräger Infinity M540 Instructions For Use Manual

External Device – Neuromuscular transmission (NMT)

Overview of NMT monitoring

The Cockpit supports communication with third-
party neuromuscular transmission devices using an
RS232 connection.
NMT monitoring measures the level of muscle
relaxation of patients under the influence of
neuromuscular blocking agents. By using an
electrical stimulus of a peripheral nerve, the muscle
response (thumb twitch) and the skin temperature
can be measured.
NMT monitoring is available for adult, pediatric, and
neonatal patients.
Before performing any monitoring functions, refer
to the section "For your safety and that of your
patients" on page 13.
For detailed information and technical
specifications regarding NMT monitoring, refer to
the documentation provided by the manufacturer of
the NMT device.

Supported parameters

The following parameters from the NMT device are
supported:
– Start NMT – Thermistor temperature (
– Single– Twitch height (%)
– TOF Ratio – Train of Four ratio (%)
– TOF-Cnt – Train of Four count (no unit of
measurement)
– PTC – Post Tetanic Count (no unit of
measurement)
All NMT parameters are trended and available on
the Infinity network and export protocol.
All trended NMT parameters are available for
network transfer. For more information (see page
163).
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Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n

Supported modes

The following modes from the NMT device are
supported:
– Single mode – measures the muscle twitch in
response to a single stimulation pulse. 1 Hz and
0.1 Hz stimulation is supported.
– TOF (Train of Four) – A sequence of four
stimulation pulses is sent and the magnitude of
the muscle twitch after each individual pulse is
measured.
– TOFs (slow Train of Four) – the user sets the
frequency of the stimulation of four pulses.
– PTC (Post Tetanic Count) – counts the
responses of tetanic stimulation followed by
single stimuli at one-second intervals
NMT modes are not displayed. Furthermore, they
are not available on the network and are not
available for export protocol.

Supported settings

The following settings from the NMT device are
supported:
– Stimulation current mode – determines if the
stimulation current was obtained automatically
or set by the user manually.
– Stimulation current – reports the current in mA
– Pulse width – reports the width of the pulse
microseconds
– Sensitivity – reports the acceleration transducer
sensitivity. This setting is for optimizing the
twitch height percentage manually.
All NMT settings are broadcast to the Infinity
network. They are not available for Export protocol.