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Grundlagen des neuromuskulären Monitorings

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Neuromuskuläres Monitoring in Klinik und Forschung

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Die Relaxometrie beurteilt die muskuläre Antwort auf die elektrische Stimulation des entsprechenden motorischen Nervs. Während die Reaktion einer einzelnen Muskelfaser auf diese Stimulation dem »Alles-oder-Nichts-Prinzip« folgt, bestimmt die Zahl der insgesamt aktivierten Muskelfasern das Ausmaß der Reizantwort des Muskels. Mit zunehmender Stromstärke kommt es zu einer progressiven Zunahme der Muskelkraft. Der betroffene Muskel entwickelt die maximal mögliche Kraft, sobald die Stärke des Reizstroms ausreicht, um alle seine Muskelfasern zu stimulieren. Mit Erreichen dieses Plateauwertes führt auch eine weitere Zunahme der Stromstärke nicht mehr zu einer Steigerung der Muskelkraft (⊡ Abb. 2.1). Diese Schwelle wird als maximale Stromstärke bezeichnet, sie kann sich bei verschiedenen Nerven geringfügig unterscheiden. Für den häufig zur Relaxometrie herangezogenen N. ulnaris liegt dieser Schwellenwert erfahrungsgemäß bei ca. 40–50 mA.

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© 2008 Springer Medizin Verlag Heidelberg

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(2008). Grundlagen des neuromuskulären Monitorings. In: Neuromuskuläres Monitoring in Klinik und Forschung. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78570-5_2

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  • DOI: https://doi.org/10.1007/978-3-540-78570-5_2

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-78569-9

  • Online ISBN: 978-3-540-78570-5

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