TetraSens delivers electrical stimulation to the peripheral nerve and directly measures the evoked electromyographic (EMG) response of the muscle (compound muscle action potential, CMAP). This provides a precise and automatic measurement of muscle response to a stimulus.

  • Quick and easy application to either hand or foot
  • Single-patient use to avoid cross contamination
  • No hand or thumb access needed during surgery
  • Designed to be used with the TetraCord cable and TetraGraph monitor

Ulnar nerve monitoring options

  • The abductor digiti minimi muscle (ADM)
  • The adductor pollicis mucle (AP)
  • The first dorsal interosseous muscle (FDI)
Monitoring the ADM muscle using TetraGraph is a better indicator to decide the adequate reversal dose of sugammadex and to confirm adequate recovery of neuromuscular function than conventional monitoring with the AP muscle using TOF-Watch SX.
Iwasaki et al | Anesth Analg, 2022
A Comparison Between the Adductor Pollicis Muscle Using TOF-Watch SX and the Abductor Digiti Minimi Muscle Using TetraGraph in Rocuronium-Induced Neuromuscular Block: A Prospective Observational Study


Flexibility and simplicity when time is limited

When recording EMG from the hand, the stimulation electrodes are placed over the ulnar nerve at the wrist and the evoked EMG response is recorded from the hand muscles; typically, either the muscle at the base of the little finger (abductor digiti minimi muscle) or from the muscle at the base of the thumb, adductor pollicis muscle. TetraSens can also be placed on the FDI muscle (first dorsal interosseous).

When the hand is inaccessible, the posterial tibial nerve can be used with EMG responses recorded from the flexor hallucis brevis muscle on the foot.

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