F-waves: neurophysiology and clinical value

Mesrati, Francine; Vecchierini, Marie-Françoise

doi:10.1016/j.neucli.2004.09.005

Cited by 134 publications

(146 citation statements)

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“…In our study, the mean F-wave persistence was 81.2%. Other studies have reported that F-wave amplitudes and persistence are decreased in clinically involved limbs, and this finding is compatible with observations of decreased central excitability (e.g., decreased tone and reflexes) in patients who are studied early after stroke 14,15. In the acute phase of stroke, F-waves may be absent owing to the hyperpolarization of spinal motor neurons; however, in the late phase, many authors report that F-waves are increased (100%) owing to the augmentation of central nervous system excitability, the disinhibition of supraspinal descending pathways, and a slow conduction period 10 . A higher persistence of F-waves in the acute phase of stroke may be related to a poorer neurological outcome 15 .…”

Section: Discussionmentioning

confidence: 99%

“…Mesrati and Vecchierini 10 reported that F-wave changes occur in central nervous system (CNS) diseases, and concluded that F-waves are absent during the acute phase of CNS lesions but persist in the chronic phase in association with spasticity and hyperreflexia. Alterations in F-waves are associated with major severity of the CNS diseases and a poor long-term motor prognosis 10 .…”

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Association between clinical condition and F-waves changes in the acute phase of stroke

Luvizutto

Bertotti

Fernandes

et al. 2016

Arq. Neuro-Psiquiatr.

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Objective To relate F-waves with clinical and laboratory exams in the acute phase of stroke. Methods Inclusion criteria for this cross-sectional study were: hemiplegia, absence of previous cranial trauma, myopathy, diabetes, alcoholism or other known causes of peripheral neuropathy, and normal sensory and motor conduction. The National Institutes of Health Stroke Scale (NIHSS) score, glycemia, glucosilate hemoglobin, and CPK were obtained at admission by routine blood exams. After hospital admission, the F-wave latencies and persistence were obtained from the deep peroneal nerve using symmetrical techniques. Results Evaluation of 20 individuals – mean age 66 years, 50% male and 85% Caucasian – showed association of F-wave persistence with glycemia (r = 0.71; p < 0.001) and NIHSS categorized (NIHSS 1-7 = 65.0 x NIHSS 9-23 = 100; p = 0.004). Multivariate analysis found only association of F-wave persistence with glycemia β = 0.59 (0.44–0.74); p < 0.001. Conclusion The increase in the persistence of F-waves are associated with hyperglycemia in the acute phase of stroke.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Association between clinical condition and F-waves changes in the acute phase of stroke

Luvizutto

Bertotti

Fernandes

et al. 2016

Arq. Neuro-Psiquiatr.

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“…Bileşik kas aksiyon potansiyeline göre çok daha küçük amplitüdlü olup periferik sinirin antidromik uyarımını takiben alfa motor nöronların geri ateşlemesi sonucu elde edildiği düşünülmektedir (1). Özellikle proksimal sinir iletimi çalışmalarında faydalı bir parametredir (2). Diabetik nöropati gibi periferik siniri diffüz olarak etkileyen hastalıkların erken saptanmasında tanısal değeri vardır.…”

Section: Sum Maryunclassified

“…Ayrıca proksimal sinir ve kök lezyonlarının tanısal elektrofizyolojik çalışmalarında da yardımcıdır (3). F dalgası çalışmalarında kullanılan en sık parametre minimum F latansıdır (Fmin) (2). Fakat tek başına duyarlılığı sınırlı olduğu için F kronodispersiyon gibi diğer parametrelerin de F dalgası çalışmalarında kullanımı önerilmektedir (4).…”

Section: Sum Maryunclassified

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Bir Grup Sağlıklı Gönüllüde Düz Bacak Germe Testinin Tibial Sinir F Dalgası Parametrelerine Etkisi

Günendi¹,

Karataş²,

Keleş³

2011

Tftr

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ÖzetAmaç: Bu çalışmanın amacı, ağlıklı gönüllülerde düz bacak germe testinin tibial sinir F dalgası parametrelerine etkisinin değerlendirilmesidir. Gereç ve Yöntem: Otuz yedi sağlıklı gönüllü (13 kadın, 24 erkek; ortalama yaş: 34,54±9,78 yıl) çalışmaya alındı. Tibial sinir F dalgası çalışması, supin pozisyonunda sağ alt ekstremite kalça eklemi nötralde ve düz bacak germe sonrası 90° fleksiyonda iken gerçekleştirildi. Her iki uygulamada F dalgasının minimum latansı (Fmin), maksimum latansı (Fmaks) ve kronodispersiyonu ölçüldü. Bulgular: Ortalama Fmin nötral pozisyonda 43,56±3,91 msn iken, düz bacak germe sonrası 90° kalça fleksiyonunda anlamlı olarak artma gösterdi (44,11±3,73 msn, p=0,026). Ortalama Fmaks düz bacak germe öncesi ve sonrası 48,31±4,40 msn ve 48,42±4,02 msn olarak ölçüldü. Her iki pozisyondaki Fmaks ölçümleri arasında anlamlı fark yoktu (p=0,625). Nötral pozisyonda ve 90° fleksiyonda ortalama kronodispersiyon değerleri sırasıyla 4,85±1,16 msn ve 4,31±1,48 msn idi. Bu iki pozisyon arasındaki fark istatistiksel olarak anlamlıydı (p=0,048). Sonuç: Bu çalışmada sağlıklı kişilerde pozisyonel lumbosakral kök geriliminin tibial sinir Fmin'de gecikmeye ve F kronodispersiyonunda azalmaya neden olduğu saptandı. Bu bulguların L5-S1 radikülopatili hastaların elektrofizyolojik değerlendirmesine yardımcı olabileceği düşünülmektedir. Türk Fiz T›p Re hab Derg 2011;57:221-4. Anah tar Ke li me ler: F dalgası, düz bacak germe testi, radikülopati Sum maryObjective: The aim of this study was to investigate the effect of the straight leg raising test on tibial nerve F-wave parameters in healthy volunteers. Materials and Method: Thirty-seven healthy volunteers (13 males, 24 females) with a mean age of 34.5±9.8 years were included in the study. Tibial nerve F-wave studies were performed on the right side while subjects were lying in supine position with hip joint in neutral position and after straight leg raising with 90° hip flexion. Minimal latency (Fmin), maximal latency (Fmax) and chronodispersion of F-wave were measured in both practices. Results: The mean Fmin was 43.56±3.91 msec at neutral position and 44.11±3.73 msec at 90° flexion. The mean Fmin was significantly increased after straight leg raising (p=0.026). The mean Fmax scores before and after straight leg rising were 48.31±4.40 msec and 48.42±4.02 msec, respectively. There was no significant difference in Fmax between the two positions (p=0.625). The mean chronodispersion values for neutral position and 90° flexion were 4.85±1.16 msec and 4.31±1.48 msec, respectively. The difference between the two positions was statistically significant (p=0.048). Conclusion: This study showed that the strain of the lumbosacral nerve roots caused an increase in Fmin and a decrease in F chronodispersion of tibial nerve in healthy subjects. These findings might be useful in electrophysiological assessment of patients with L5-S1 radiculopathies. Turk J Phys Med Re hab 2011;57:221-4.

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Muscle Excitability Abnormalities in Machado-Joseph Disease

França

D’Abreu²,

Nucci³

et al. 2008

Arch Neurol

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To estimate the frequency of and to characterize muscle excitability abnormalities in Machado-Joseph disease (MJD).Design: Machado-Joseph disease is a common autosomal dominant cerebellar ataxia caused by an unstable CAG trinucleotide repeat expansion. Muscle cramps and fasciculations are frequent and sometimes disabling manifestations. However, their frequency and pathophysiological mechanisms remain largely unknown. Symptomatic patients with MJD (hereinafter MJD patients) with molecular confirmation were assessed prospectively. A standard questionnaire addressing clinical features of muscle cramps and fasciculations was used. The Cramps Disability Scale was used to quantify crampsrelated disability. Patients underwent neurophysiological testing with routine techniques. F waves of the right median nerves were obtained, and persistence indexes were calculated. Four muscles (deltoid, first dorsal interossei, tibialis anterior, and vastus lateralis) were examined by needle electromyography. A semiquantitative scale (from 0 [no activity] to 4 [continuous activity]) was used to determine the frequency of rest fasciculations in each muscle.Results: Fifty MJD patients (29 men) were included in the study. Their mean age at examination was 46.3 years, their mean age at onset of the disease was 35 years, and the mean duration of disease was 11.2 years. Abnormal CAG n varied from 59 to 75 repeats. Forty-one patients presented with muscle cramps; in 10, this was their first symptom. The frequency of cramps varied between 1 and 90 episodes a week. For 15 patients, cramps were the chief complaint, frequently disturbing sleep or work (Cramps Disability Scale score, 2 or 3). Lower limbs were affected in 37 individuals, but unusual regions, such as the face and abdominal muscles, were also involved. Fasciculations were found in 25 individuals; in 8 patients, they included facial muscles. However, fasciculations were not a significant complaint for any of these patients. The clinical and neurophysiological profile of MJD patients with and without cramps was not significantly different. However, MJD patients with fasciculations had more severe damage to their peripheral nerves.Conclusions: Muscle excitability abnormalities were found in 41 MJD patients (82%), and they were the presenting complaint in 10 (20%). They are related to altered excitability of peripheral motor axons, but mechanisms underlying cramps and fasciculations are possibly distinct in MJD patients.

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F-waves: neurophysiology and clinical value

Cited by 134 publications

References 147 publications

Association between clinical condition and F-waves changes in the acute phase of stroke

Association between clinical condition and F-waves changes in the acute phase of stroke

Bir Grup Sağlıklı Gönüllüde Düz Bacak Germe Testinin Tibial Sinir F Dalgası Parametrelerine Etkisi

Muscle Excitability Abnormalities in Machado-Joseph Disease

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