Muscles alive: ultrasound detects fibrillations

Sigrid Pillen, Mark Nienhuis, Johannes P van Dijk, Ilse M P Arts, Nens van Alfen, Machiel J Zwarts

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

35 Citaten (Scopus)


OBJECTIVE: Muscle ultrasound is capable of visualizing muscle movements. Recent improvements in ultrasound technology have raised the question whether it is also possible to detect small-scale spontaneous muscle activity such as denervation. In this study we investigated the ability of dynamic muscle ultrasound to detect fibrillations.

METHODS: Eight patients with fibrillations were measured simultaneously by ultrasound and EMG to verify which movements on ultrasound examination corresponded to fibrillation potentials on EMG. The temperature dependency of ultrasound detected fibrillations and the observer agreement was assessed in five healthy subjects with focal denervation induced by botulinum toxin.

RESULTS: Fibrillations appeared on ultrasound examination as small, irregularly oscillating movements within the muscle while the overall shape of the muscle remains undisturbed. Visibility of fibrillations with ultrasound decreased with lower temperatures, with a 32% decrease at 30 degrees C compared to 39 degrees C. The interobserver agreement was substantial with a kappa of 0.65 for experienced observers.

CONCLUSION: Fibrillations could be visualized with ultrasound. Consistent results could be obtained from trained observers. Care has to be taken to ensure an optimal muscle temperature to avoid false negative results, especially in distal muscles.

SIGNIFICANCE: Visualization of fibrillations by muscle ultrasound opens the way for a new diagnostic application of this technique.

Originele taal-2Engels
Pagina's (van-tot)932-936
Aantal pagina's5
TijdschriftClinical Neurophysiology
Nummer van het tijdschrift5
StatusGepubliceerd - mei 2009
Extern gepubliceerdJa

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