Comparison of train-of-four ratios measured with Datex-Ohmeda's M-NMT MechanoSensor and M-NMT ElectroSensor

Jarno Salminen (Corresponding Author), Mark van Gils, Markku Paloheimo, Arvi Yli-Hankala

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)


    Neuromuscular blockade is usually monitored using train-of-four (TOF) stimulation pattern. A TOF ratio of higher than 90 % is recommended to reduce the risk of adverse effects after anaesthesia. TOF ratio 90 % is used in clinical practice with all different neuromuscular monitors. Kinemyography (KMG) is one commercialized method to obtain numerical TOF values. We compared the KMG data obtained with Datex M-NMT MechanoSensorT module, to the EMG data collected with Datex ElectroSensorT, during clinical anaesthesia. Ipsilateral comparisons of the sensors were performed in 20 female patients during clinical procedures in propofol-remifentanil anaesthesia. After initial bolus dose of rocuronium (0.6 mg/kg), the spontaneous recovery of TOF ratio and T1 % were monitored. KMG gave higher TOF values than EMG. The difference was significant at KMG TOF values of 40 % or higher. After anaesthetic induction, but before administration of rocuronium, both TOF sensor values drifted from the TOF value of 1.0, showing either significant spontaneous fade (T1 > T4) or tendency of reverse fade (T1 <T4). KMG overestimates the recovery from neuromuscular blockade when compared with EMG. KMG and EMG cannot be used interchangeably, and TOF ratio 90 % cannot be considered as adequate level of recovery with all monitoring devices.
    Original languageEnglish
    Pages (from-to)295-300
    JournalJournal of Clinical Monitoring and Computing
    Issue number3
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed


    • Electromyography
    • EMG
    • Kinemyography
    • KMG
    • M-NMT MechanoSensor
    • Neuromuscular monitoring


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