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  • Küçük Resim
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    Delayed habituation in Behcet's disease
    (Neurol Soc India, 2008) Gültürk, Sefa; Akyol, Melih; Keçeci, Hulusi; Özçelik, Sedat; Çınar, Ziynet; Demirkazık, Ayşe
    Background: The autonomic nervous system in Behcet's patients may be affected due to various reasons. This entity may be detected with the measurement of the electrodermal activities, heart rate variability and pupillometric methods. Habituation is one of the implicit forms of learning and memory and the loss of habituation can reveal pathological changes in the synaptic regions. Aim: To determine whether there is a functional decrease in the synaptic effectiveness (habituation) of the pathways to sympathetic neurons that had been repeatedly activated in Behcet's. Materials and Methods: Twelve patients with Behcet's disease and 12 healthy controls were included in the study. Sympathetic skin potential (SSP) records were taken at normal room temperature in a quiet place within a Faraday cage. Sixteen square wave single shock impulses (duration: 1200 mu s, strength: 5 mA) were applied on each case. Results: After the 1(st) stimulus, the SSP amplitudes were lower in the patients compared to the controls (P 0.001, t value = 7.69). There was no significant differences among the SSP amplitudes after the 13(th) impulse in the patients (P>0.05). Whereas there was no significant differences among the SSP amplitudes after the 9(th) impulse in the controls (P>0.05). The habituation rate of the SSP after consecutive impulses was slowest in the patients compared to controls (P<0.001, t value = 12.39). Conclusions: There is a delayed habituation in Behcet's disease and that may due to pathologic changes with vasculitis through their peripheral nerves.
  • Küçük Resim
    Öğe
    Habituation of auditory event-related potentials in patients with Behcet's disease
    (Springer-Verlag Italia Srl, 2004) Keçeci, Hulusi; Kavak, Ayşe; Akyol, Melih; Değirmenci, Yıldız; Anul, H.
    Behcet's disease is a progressive and/or relapsing-remitting multisystem inflammatory disorder. Involvement of the central nervous system occurs in 10%-29% of cases with Behcet's disease. The aim of the present study was to assess the effect of repetitive auditory stimulations on event-related potentials (ERP) in patients with Behcet's without neurologic manifestations. The study was performed in 14 patients with Behcet's disease and 14 healthy volunteers. ERPs were recorded from Fz, Cz and Pz. The auditory ERPs test was continued until 20 artefact-free rare tones were averaged, which was accepted as one trial block. After six blocks were obtained in a sequential manner, the test was completed. According to the results of the present study, P300 latency changed in different manners over trial blocks in the two groups. P300 latency values showed a progressive increase in the controls; however this was not determined in the Behcet's group. Thus, habituation was not observed in the patient group. Because of the lack of habituation related to P300 latency, it may be thought that there is an insidious pathologic process in Behcet's disease without neurologic manifestation.