F Tabaraud

University of Limoges, Limages, Limousin, France

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Publications (63)112.11 Total impact

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    ABSTRACT: Our work was aimed to evaluate Alzheimer's disease diagnosis improvement using cerebrospinal fluid biomarkers (CSF) in neurological daily practice. For this purpose, 150 patients clinically and neurochemically classified as having AD or cognitive impairment with or without other dementia type were included in the study. The following CSF peptides were studied, blindly to the clinical diagnosis: beta-amyloid(1-42) peptide (Aβ(1-42)), Tau (T-tau), threonine-181 hyperphosphorylated tau protein (P-tau(181)), and beta-amyloid(1-40) peptide (Aβ(1-40)). From these measurements, Innotest® Amyloid Tau Index (IATI) was calculated for each patient. This assessment allowed to separate 83 biochemical profiles of AD and 67 non-Alzheimer's disease (non-AD), both AD and non-AD categories match with clinical data amounting to 73% and 90%, respectively. Among mild cognitive impairment (MCI) patients, CSF biomarkers led to discriminate those who are likely to be AD. We devoted a special section to Aβ(1-40) which is not a routine parameter but can help to confirm a pathological amyloid process as Aβ(1-42)/Aβ(1-40) ratio underlining the real decline of the Aβ(1-42). The interest of biomarkers and their ability to solve awkward cases were carefully noticed all the more when a discrepancy between clinical and CSF biological data was involved. The final proposed algorithm allowed to identify pathogenic forms of AD according to the prevailing role of hyperphosphorylated tau or amyloid beta peptide.
    Acta Neurologica Scandinavica 09/2011; 125(6):416-23. · 2.47 Impact Factor
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    ABSTRACT: Numerous sets of electrophysiological criteria of chronic inflammatory demyelinating polyneuropathy (CIDP) have been proposed, among which the criteria established by an ad hoc subcommittee of the American Academy of Neurology (AAN) in 1991 (Neurology 41 (1991) 617) are the most widely used. As they seemed rather restrictive, the Inflammatory Neuropathy Cause and Treatment (INCAT) group (Ann. Neurol. 50 (2001) 195) proposed modifications of these electrophysiological criteria. However, even using these criteria, some cases of CIDP may not be recognized. In such cases, nerve biopsy has proven useful for confirmation of the diagnosis by demonstrating specific abnormalities. The objective of the study was to determine the profile of electrophysiological abnormalities in patients with atypical electrophysiologic criteria of CIDP and the diagnostic value of multiple A waves and a low median to sural amplitude ratio. Over a period of 3 years, we classified 44 patients into two categories: those presenting the strict AAN and/or INCAT criteria and those who we regarded as cases of CIDP not meeting these criteria. All patients benefited from one or more clinical and electrophysiological examination. Extensive biological workup and genetic study when appropriate excluded other causes of neuropathy. Nerve biopsies were taken from all patients and samples were included in paraffin and epon for systematic light, teasing and electron microscopic examination. Out of 44 patients, 36 fulfilled the INCAT or AAN criteria. In eight other patients, the diagnosis of CIDP was suspected on clinical and EMG examinations and confirmed by nerve biopsy. In these cases, the electrophysiological exploration showed some abnormalities such as multiple A waves in four out of eight patients or an abnormal pattern of the sensory responses of the median and sural nerves in four out of eight patients that were more indicative of an initial demyelinating process. Six of our patients received immunomodulatory treatment, and five responded favorably.
    Neurophysiologie Clinique/Clinical Neurophysiology 05/2004; 34(2):71-9. · 2.55 Impact Factor
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    ABSTRACT: Motor evoked potentials can be affected by propofol anaesthesia. We studied how increasing target concentrations of propofol altered transcranial motor evoked potentials (tcMEP) during scoliosis surgery. Fifteen patients undergoing surgery for scoliosis were anaesthetized with remifentanil and propofol without nitrous oxide or neuromuscular blocking agents (BIS<60). tcMEP were elicited by transcranial electric multipulse stimulation of the motor cortex and recording of compound action potentials from the anterior tibialis muscle. tcMEP were obtained before surgery with propofol target values set from 4 to 8 mg litre(-1), and then during surgery. Arterial propofol concentrations were measured for each tcMEP recording. Before surgery, increasing propofol reduced tcMEP amplitude in a dose-dependent manner, with no effect on latency. During surgery, at equivalent propofol concentrations, tcMEP were not statistically different from those obtained before surgery. In all except one patient, tcMEP signals were present during the entire procedure. In this patient the loss of tcMEP was unfortunately related to an anterior spinal cord lesion, which was confirmed by a wake-up test. We found that, although propofol had a dose-dependent effect on tcMEP amplitude, anaesthesia could be maintained with remifentanil and propofol to allow recording and interpretation of tcMEP signals.
    BJA British Journal of Anaesthesia 10/2003; 91(4):493-7. · 4.24 Impact Factor
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    ABSTRACT: A 42-year-old man presented exercise-induced muscle pain without myogloburia since the age of 12 years. Histochemistry and electronmicroscopy of a muscle biopsy revealed subsarcolemmal and inter-myofibrillar accumulation of glycogen. Exercise on a bicycle ergometer produced a normal raise of lactate. Biochemical study showed a partial defect in phosphorylase activity.
    Revue Neurologique 08/2003; 159(6-7 Pt 1):681-4. · 0.51 Impact Factor
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    ABSTRACT: The diagnosis of chronic inflammatory demyelinating polyneuropathy (CIDP) relies primarily on clinical and electrophysiologic examination, but the nerve biopsy findings may be supportive, especially in atypical cases. In order to define the usefulness of nerve biopsy in this disease, we retrospectively studied 44 consecutive patients whom we classified as having CIDP on pathological grounds. We found that 8 of these 44 patients had pathological findings indicative of CIDP but did not meet any of the usually accepted electrophysiological criteria for its diagnosis. Among these eight patients, five responded favorably to conventional therapy. All of these eight patients had an electrophysiological pattern of generalized axonopathy with additional subtle findings suggestive of demyelination that prompted us to perform a nerve biopsy. Our data suggest that a significant number of patients with unrecognized CIDP are erroneously classified as having chronic idiopathic axonal polyneuropathy. CIDP should be suspected if the electrophysiological examination displays subtle abnormalities suggestive of demyelination, even in the presence of a prominent axonal pattern. Nerve biopsy in these patients may reveal abnormalities suggestive of CIDP and guide therapeutic options.
    Muscle & Nerve 05/2003; 27(4):478-85. · 2.31 Impact Factor
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    ABSTRACT: Schnitzler's syndrome is a rare etiology of chronic urticaria. The disease is characterized by the association of chronic urticaria, intermittent chronic fever, bone pain, osteosclerotic bone lesions and IgM monoclonal gammapathy. More than fifty patients with this syndrome have been reported since Schnitzler reported the first case in 1974, but neuropathies are seen only in a few cases. Our patient developed, eight years after the diagnosis of Schnitzler'syndrome, a peripheral sensitive neuropathy. Anti-myelin-associated glycoprotein antibodies were not significant. A nerve biopsy specimen has revealed aspecific demyelinization. Direct and indirect immunofluorescence were negative. We conclused is that our patient presented chronic inflammatory demyelinating polyneuropathy. We found one published case of Schnitzler's syndrome and myelin-associated glycoprotein reactive peripheral neuropathy. The diagnosis of chronic inflammatory demyelinating polyneuropathy is a diagnosis of elimination. It is not the most common neuropathy associated with monoclonal gammapathy. To the best of our knowledge, it is the first case of Schnitzler's syndrome with this type of neuropathy. But there are some descriptions of chronic inflammatory demyelinating polyneuropathy presenting autoantibody activity against a myelin component, up to two years after the diagnosis of IgM monoclonal gammapathy.
    Annales de Dermatologie et de Vénéréologie 04/2003; 130(3):348-51. · 0.60 Impact Factor
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    ABSTRACT: A prospective, multicenter, open-label study was conducted to determine the safety and efficacy of intramuscular (IM) interferon beta-1a (IFNbeta-1a) (Avonex) for treatment of chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). Eligible patients received IM IFNbeta-1a 30 microg once weekly for 6 months. Safety and tolerability were evaluated by reporting of adverse events, measurement of vital signs, and results of blood chemistry, hematology, and urinalysis. The primary efficacy end points were changed from baseline to month 6 on a quantitative Neurologic Disability Score (NDS), a clinical grading (CG) scale, and grip strength (GS) measures. Electrophysiologic measurements were performed at baseline and month 6. A total of 20 treatment-resistant patients with CIDP were enrolled in the study. The tolerability of IFNbeta-1a in patients with CIDP was similar to that seen with its use in MS. There were no serious adverse events, and no patients discontinued treatment due to adverse events. Seven patients (35%) showed clinical improvement, 10 (50%) had stable disease, and 3 (15%) continued to deteriorate. Significant improvements from baseline were observed in NDS in both the intent-to-treat and per protocol analyses (p=0.0005). For CG, significant improvement from baseline was observed in the per protocol analysis (p<0.05) but not in the intent-to-treat analysis. There was no significant effect of treatment on GS. Clinical improvement was not dependent on age, gender, clinical form of CIDP, or duration of symptoms. Electrophysiologic data showed improvements in mean median, ulnar, and tibial motor nerve potential areas. There was no correlation between clinical improvement and electrophysiologic data. The promising results of this study, especially given the refractory nature of the patient population, suggest that a larger placebo-controlled study should be performed to further evaluate the efficacy of IM IFNbeta-1a for the treatment of CIDP.
    Neurology 04/2003; 60(8 Suppl 3):S23-8. · 8.25 Impact Factor
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    ABSTRACT: The objective of the study was to define how could be helpful a nerve biopsy for identification of atypical cases of chronic inflammatory demyelinating polyneuropathy (CIDP). An ad hoc committee in 1991 defined the clinical, electrophysiological and pathological criteria for diagnosis of CIDP. In common with other authors, we regard the rather specific electrophysiological criteria as being too restrictive, and we think that a significant number of patients may therefore not benefit from effective treatment or be excluded from therapeutic trials. The Inflammatory Neuropathy Cause and Treatment (INCAT) group (2001) has proposed new electrophysiological criteria of CIDP, which are more sensitive and do not loose any specificity. Over a period of three years (January 1999 to December 2001), we classified 44 patients into two categories: those presenting the strict criteria of the ad hoc committee and those who we regarded as cases of CIDP who did not meet these strict criteria. All these patients benefited from one or more clinical and electrophysiological examinations; extensive biological workup and genetic study when appropriate excluded other causes of neuropathy. Nerve biopsies were taken from all patients and samples were included in paraffin and epon for systematic light and electron microscopic examination. Out of 44 patients, 24 fulfilled the INCAT electrophysiological criteria with only 12 of these cases fulfilling the criteria of the ad hoc committee. Eight patients did not fulfill any of the widely accepted electrophysiological criteria of CIDP. However, study of nerve biopsies of these eight patients revealed histological features characteristic of CIDP according to histological criteria (AAN-1991). Among these patients, six have been treated and five responded favorably to conventional treatments for CIDP. Without information from the nerve biopsy, these patients would not have been treated effectively because their electrophysiological profile was indicative of axonal impairment interpreted erroneously as primary.
    Bulletin de l'Académie nationale de médecine 02/2003; 187(2):387-99; discussion 399-403. · 0.16 Impact Factor
  • J M Vallat, F Tabaraud, L Magy, F Macian
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    ABSTRACT: The Chronic Inflammatory Demyelinating Polyradiculoneuropathies (CIDP) constitute a syndrome whose incidence is difficult to evaluate, and is probably underestimated. In the course of this presentation, we deliberately restricted discussion to issues raised in recent years concerning the extent of this syndrome. We discuss diagnostic criteria, especially electrophysiological ones. As the criteria proposed by the ad hoc committee of the American Academy of Neurology in 1991 have been questioned due to lack of sensitivity, new ones have been proposed recently. We briefly discuss the different types of chronic dysimmune demyelinating neuropathy: not only the CIDP, but also the Lewis and Sumner syndrome or multifocal inflammatory demyelinating neuropathy and the multiple conduction block neuropathies. At last, we point out the consistent finding of axonal involvement in the course of a chronic demyelinating neuropathy; over time, it can become pre-dominant, which may make diagnosis difficult by suggesting a chronic axonal neuropathy that may be assumed to be primary. Consideration of these points may help clinicians recognize more chronic dysimmune neuropathies, for which immunosuppressive therapy has been found to be effective.
    Revue Neurologique 01/2003; 158(12 Pt 2):S27-31. · 0.51 Impact Factor
  • J.-M. Vallat, F. Tabaraud, L. Magy, F. Macian
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    ABSTRACT: The Chronic Inflammatory Demyelinating Polyradiculoneuropathies (CIDP) constitute a syndrome whose incidence is difficult to evaluate, and is probably underestimated. In the course of this presentation, we deliberately restricted discussion to issues raised in recent years concerning the extent of this syndrome. We discuss diagnostic criteria, especially electrophysiological ones. As the criteria proposed by the ad hoc committee of the American Academy of Neurology in 1991 have been questioned due to lack of sensitivity, new ones have been proposed recently. We briefly discuss the different types of chronic dysimmune demyelinating neuropathy: not only the CIDP, but also the Lewis and Sumner syndrome or multifocal inflammatory demyelinating neuropathy and the multiple conduction block neuropathies. At last, we point out the consistent finding of axonal involvement in the course of a chronic demyelinating neuropathy; over time, it can become predominant, which may make diagnosis difficult by suggesting a chronic axonal neuropathy that may be assumed to be primary. Consideration of these points may help clinicians recognize more chronic dysimmune neuropathies, for which immunosuppressive therapy has been found to be effective.
    Revue Neurologique 01/2003; 158(123):27-31. · 0.51 Impact Factor
  • J M Vallat, F Tabaraud, L Magy, P Couratier
    Revue Neurologique 10/2002; 158(8-9):782-3. · 0.51 Impact Factor
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    ABSTRACT: Ventricular tachycardia by branch to branch reentry is a rare arrhythmia. It occurs in cardiomyopathies associated with conduction defects. During tachycardia a His potential precedes each QRS complex which usually has a left bundle branch block appearance. The authors report two familial cases of ventricular branch to branch tachycardia (son and mother) without cardiomyopathy. The diagnosis of Steinert's disease was made post-mortem in these two patients. In cases of branch to branch ventricular tachycardia, the diagnosis of myotonic dystrophy should be excluded. Conversely, endocavitary electrophysiological investigation with ventricular stimulation should be proposed for symptomatic patients (dizzy spells, syncope) to diagnose branch to branch ventricular tachycardia, even in cases with conduction defects which could also explain the symptoms.
    Archives des maladies du coeur et des vaisseaux 07/2000; 93(6):743-9. · 0.40 Impact Factor
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    ABSTRACT: A few studies have reported a variety of nonspecific histological lesions in patients with IgA monoclonal gammopathies and polyneuropathy. In our case, using electron microscopy, we observed widenings of the myelin lamellae identical to those commonly described in IgM neuropathies with anti-myelin-associated glycoprotein activity. Using immunoelectron microscopy, we demonstrated a direct involvement of IgA in myelin lesions. The search for a direct link between monoclonal dysglobulinemia, regardless of type, and polyneuropathy is important and may influence treatment.
    Annals of Neurology 07/2000; 47(6):808-11. · 11.19 Impact Factor
  • Revue Neurologique 05/2000; 156(4):403-4. · 0.51 Impact Factor
  • Revue Neurologique 03/2000; 156(2):179. · 0.51 Impact Factor
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    ABSTRACT: Many studies have shown that the risk of experiencing a myocardial infarction (MI) is increased during the first hours of the morning. Sleep apnea syndrome (SAS) is associated with an enhanced adrenergic activity, prolonged a few hours after awakening. We aimed at assessing whether sleep breathing disorders could be a culprit for the morning excess rate of MI. We studied 40 middle-aged men admitted for an acute MI. An overnight polysomnographic study was performed 37.4 +/- 9.4 days after the MI. The prevalence of SAS was high (30%). The prevalence of SAS was significantly higher in patients with the MI onset during the morning. The circadian pattern was significantly different in patients with or without SAS: those with SAS presented an important peak of MI onset during the period between 06.00 and 11.59 h. None of them had their MI during the period between 24.00 and 05.59 h. This different nyctohemeral pattern underlines the potential role of sleep breathing disorders as a trigger of MI.
    Cardiology 02/2000; 94(3):188-92. · 1.52 Impact Factor
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    ABSTRACT: X-linked Charcot-Marie-Tooth disease (CMT-X) is caused by mutations of connexin-32 (Cx-32), which encodes a gap-junction protein. Whether the neuropathy is primarily demyelinative or axonal remains to be established. We report findings of prominent demyelination in a 71-year-old woman with late-onset disease. Electrophysiological studies revealed a nonuniform slowing of motor conduction velocities and dispersion of compound action potentials indicative of a demyelinating process which was confirmed by nerve biopsy. Such electrophysiological features are unusual in hereditary neuropathies and are more commonly found with acquired chronic demyelinating neuropathies. A systematic search confirmed the molecular genomic diagnosis of CMT-X, illustrating the value of such tests in sporadic cases. Severity of clinical symptoms and signs may vary with age and sex of the patient. The pathology of CMT-X in other reported cases has been variably interpreted as axonal, demyelinating, or showing both features. Our observations emphasize the demyelinative nature.
    Muscle & Nerve 11/1999; 22(10):1442-7. · 2.31 Impact Factor
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    ABSTRACT: X-linked Charcot–Marie–Tooth disease (CMT-X) is caused by mutations of connexin-32 (Cx-32), which encodes a gap-junction protein. Whether the neuropathy is primarily demyelinative or axonal remains to be established. We report findings of prominent demyelination in a 71-year-old woman with late-onset disease. Electrophysiological studies revealed a nonuniform slowing of motor conduction velocities and dispersion of compound action potentials indicative of a demyelinating process which was confirmed by nerve biopsy. Such electrophysiological features are unusual in hereditary neuropathies and are more commonly found with acquired chronic demyelinating neuropathies. A systematic search confirmed the molecular genomic diagnosis of CMT-X, illustrating the value of such tests in sporadic cases. Severity of clinical symptoms and signs may vary with age and sex of the patient. The pathology of CMT-X in other reported cases has been variably interpreted as axonal, demyelinating, or showing both features. Our observations emphasize the demyelinative nature. © 1999 John Wiley & Sons, Inc. Muscle Nerve 22: 1442–1447, 1999
    Muscle & Nerve 09/1999; 22(10):1442 - 1447. · 2.31 Impact Factor
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    ABSTRACT: Charcot-Marie-Tooth type 1B (CMT 1B) disease, an inherited demyelinating peripheral neuropathy, results from different point mutations located in the P0 gene on chromosome 1 q21-23. We have quantified, at the ultrastructural level, the immunocytochemical expression of the P0 protein in two unrelated CMT 1B patients with mutations (Ser 78 to Leu and Asn 122 to Ser) located in two different exons in the extracellular domain of the protein. A twofold decrease in P0 expression was observed in compact myelin in each case, compared with age-matched controls. The severity of the phenotypes showed no direct relationship to the levels of P0 protein expression in these 2 patients.
    Muscle & Nerve 02/1999; 22(1):99-104. · 2.31 Impact Factor
  • Neurophysiologie Clinique-clinical Neurophysiology - NEUROPHYSIOL CLIN. 01/1998; 28(2):182-183.

Publication Stats

551 Citations
112.11 Total Impact Points

Institutions

  • 1989–2003
    • University of Limoges
      Limages, Limousin, France
  • 1987–1996
    • Centre Hospitalier Universitaire de Limoges
      • Department of Neurology
      Limoges, Limousin, France