28 - 2 BeneVision N22/N19 Patient Monitor Operator’s Manual
28.1 NMT Introduction
The neuromuscular transmission (NMT) module evaluates muscle relaxation of patients under neuromuscular
block by measuring the strength of muscle reaction after electrically stimulating the dedicated motor nerve. The
electrodes are placed on the patient’s skin over dedicated nerve. A controllable current source delivers
stimulation pulses to two skin surface electrodes for the nerve stimulation, and the muscle response is measured
with an acceleration sensor.
NMT monitoring is intended for adult and pediatric patients.
28.2 NMT Safety Information
• The NMT measurement is not intended for neonatal patients.
• The NMT stimulation should not be applied across or through the head, directly on the eyes,
covering the mouth, on the front of the neck, especially the carotid sinus, or from electrodes placed
on the chest and the upper back or cross over the heart.
• Application of electrodes near the thorax may increase the risk of cardiac fibrillation.
• Never apply electrodes to patients in areas where inflammation or injury is evident.
• When you are connecting the electrodes or the patient cable, make sure that the connectors do not
touch any electrically conductive material including earth.
• Patients with nerve damage or other neuromuscular problems may not respond properly to
stimulation. The NMT measurement may show unusual patterns when monitoring muscle paralysis
in these patients.
• NMT stimulation current pulses may interfere with other sensitive equipment, for example,
implanted cardiac pacemakers. Do not use the NMT measurement on patients with implanted
medical devices unless so directed by a medical specialist.
• Simultaneous use of the NMT with high frequency electrosurgical equipment (ESU) may result in
burns at the stimulation site and can also adversely affect measurement accuracy. Make sure the
ESU return electrode is properly applied to the patient.
• Do not use the NMT in close proximity to shortwave or microtherapy devices, there is a risk of
adversely affecting the NMT measurement.
• Never touch the electrodes unless the stimulation has been stopped.
• Check each time before use that the material insulating the NMT sensor and the stimulation cable is
intact and does not show signs of wear and tear.
(1) Calibration hard key (2) Start/stop key
(3) Module status indicator (4) NMT patient cable connector
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