Relaxation

Comparison of evoked KMG, MMG and EMG responses during recovery

Markku Paloheimo, M.D., Ph.D.

The whole article available in PDF: 71 KB

In the following KMG, EMG and MMG are compared to each other during recovery. Datex-Ohmeda MechanoSensor and Datex-Ohmeda ElectroSensor have been used.

KMG/MMG
The patient was anesthetized using fentanyl-isoflurane and nitrous oxide/oxygen. The Figure depicts monitored recovery from a rocuronium-induced neuromuscular when using the Datex-Ohmeda MechanoSensor between the third and fourth fingers in a hand placed into a mechanomyometric device (Staneck’s board), which measures evoked isometric force in the thenar muscle (Figure 1). Electrically evoked responses to supramaximal ulnar train-of-four (TOF) or double burst (DB3,3) stimulations were measured by alternating the NMT trunck cables in the AS3/AM M-NMT every 30 s. The graph shows that KMG measurement is a bit more sensitive to evoke potentials than MMG measurement. However, the measurements in their entirety are comparable.

	TOF	DB3,3
Kinemyography (KMG)
Mechanomyography (MMG)

EMG/MMG
The patient was anesthetized using fentanyl-isoflurane and nitrous oxide/oxygen. The Figure depicts monitored recovery from a rocuronium-induced neuromuscular block when using electromyographic (EMG) recording electrodes on the first dorsal interosseal muscle and index finger in a hand placed into a mechanomyometric device (Staneck’s board), which measures evoked isometric force in the thenar muscle (Figure 2). Electrically evoked responses to supramaximal ulnar train-of-four (TOF) or double burst (DB3,3) stimulations were measured by alternating the NMT trunck cables in the AS3/AM M-NMT every 30 s. First EMG-responses to each burst (first and fourth of the whole sequence) are used to calculate the double-burst ratios. The results are fully comparable.

	TOF	DB3,3
Electromyography (EMG)
Mechanomyography (MMG)

KMG/EMG
The patient was anesthetized using fentanyl-isoflurane and nitrous oxide/oxygen. The Figure depicts monitored recovery from a rocuronium-induced neuromuscular block when using the Datex-Ohmeda kinemyographic (KMG) MechanoSensor between the thumb and index finger and electromyographi (EMG) recording electrodes on the first dorsal interosseal muscle and index finger (Figure 3). Electrically evoked responses to supramaximal ulnar train-of-four (TOF) or double burst (DB3,3) stimulations were measured by alternating the NMT trunck cables in the AS3/AM M-NMT every 30 s. First EMG-responses to each burst (first and fourth of the whole sequence) are used to calculate the double-burst ratios. KMG awakes first partly due to low peripheral skin temperature.

	TOF	DB3,3
Kinemyography (KMG)
Electromyography (EMG)

Last updated: 1 June 2000
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