Visual evoked potential as an early marker of diabetic retinopathy

2016 ◽  
Vol 3 (2) ◽  
pp. 200 ◽  
Author(s):  
Farisa Khatoon ◽  
Farah Bahmed ◽  
Nazeema Khatoon
Author(s):  
Bill Jones Tanawal ◽  
Melke Joanne Tumboimbela ◽  
Corry Novita Mahama

ROLE OF VISUAL EVOKED POTENTIAL IN TYPE-2 DIABETES MELLITUS WITH AND WITHOUT DIABETIC RETINOPATHYABSTRACTIntroduction: Diabetic retinopathy (DR) is a common complication of type-2 diabetes mellitus (T2DM). Minimal functional change of neural layers of the retina occurs before structural changes, thus undetected by funduscopy. This damage could be identified earlier by P100 latency changes in visual evoked potential (VEP).Aims: To find the characteristic  of P100 in T2DM with and without DR, its correlation  with the duration of thedisease and the level of fasting blood glucose (FBG).Methods: A cross sectional analysis study was conducted in Prof. dr. R.D. Kandou Hospital, Manado, from November2017-January 2018. T2DM patients aged 18-60 with visual acuity  >6/60, without neuro-ophtalmological disorders and other metabolic diseases. P100 latency was measured using VEP with reversed checkerboard stimulation.Results: There were 56 subjects with T2DM, mostly were females (57,1%) and age mean was 54,86±5,65 years. Delayed P100 latency occurred in 85,7% subjects. Diabetic retinopathy subjects showed delayed P100 latency on right (92,31%) and left (88%) eyes while T2DM subjects without retinopathy showed delayed P100 latency on both eyes 70%. There were strong and significant positive correlation between the duration of T2DM and P100 latency on the right and left eyes. There was no significant correlation between fasting blood glucose (FBG) level and P100 latency.Discussions: Delayed P100 latency occurs in T2DM patients with and without retinopathy. The duration of T2DMcorrelates with the delay of P100 latency but not with the level of FBG.Keywords: Diabetic retinopathy, P100, type-2 diabetes mellitus, visual evoked potential ABSTRAKPendahuluan: Retinopati diabetik adalah suatu komplikasi yang umum terjadi pada diabetes melitus tipe-2 (DMT2). Sebelum terjadinya perubahan struktural, lapisan neuron retina pasien DMT2 sudah mengalami perubahan fungsional minimal yang tidak terdeteksi dengan funduskopi. Hal ini dapat diidentifikasi lebih dini berdasarkan gambaran latensi gelombang P100 pada pemeriksaan visual evoked potential (VEP).Tujuan: Untuk mengetahui karakteristik nilai gelombang P100 pada pasien DMT2 dengan dan tanpa retinopati diabetik, serta hubungannya dengan lama penyakit dan kadar glukosa darah puasa (GDP).Metode: Penelitian analitik dengan desain potong lintang terhadap pasien DMT2 yang dirawat di RSUP Prof. dr. R.D. Kandou, Manado periode November 2017-Januari 2018. Subjek berusia 18-60 tahun dengan visus >6/60 tanpa adanya kelainan neuro-oftamologi dan penyakit metabolik lain. Dilakukan perekaman VEP menggunakan stimulasi reversed checkerboard dilanjutkan pengukuran latensi gelombang P100.Hasil: Didapatkan 56 subjek, paling banyak perempuan (57,1%) dan rerata usia 54,86±5,65 tahun. Latensi P100 memanjang pada 85,7% subjek. Pada subjek dengan retinopati ditemukan mayoritas mengalami pemanjangan latensi pada mata kanan (92,31%) dan mata kiri (88%), sedangkan pada subjek tanpa retinopati ditemukan pemanjangan latensi kedua mata adalah 70%. Terdapat hubungan bermakna dengan korelasi positif kuat antara lamanya DMT2 dan latensi P100 kanan dan kiri. Tidak terdapat hubungan yang bermakna antara kadar GDP dan latensi P100.Diskusi: Pemanjangan latensi P100 terjadi pada subjek DMT2 dengan dan tanpa retinopati. Lamanya DMT2 berhubungan dengan pemanjangan latensi P100, tetapi kadar GDP tidak berhubungan dengan pemanjangan latensi P100.Kata kunci: Diabetes melitus tipe-2, P100, retinopati diabetik, visual evoked potential


2019 ◽  
Vol 63 (4) ◽  
pp. 367-371
Author(s):  
Angela Corduneanu ◽  
Veronica Chişca ◽  
Natalia Ciobanu ◽  
Stanislav Groppa

2002 ◽  
Vol 16 (2) ◽  
pp. 71-81 ◽  
Author(s):  
Caroline M. Owen ◽  
John Patterson ◽  
Richard B. Silberstein

Summary Research was undertaken to determine whether olfactory stimulation can alter steady-state visual evoked potential (SSVEP) topography. Odor-air and air-only stimuli were used to determine whether the SSVEP would be altered when odor was present. Comparisons were also made of the topographic activation associated with air and odor stimulation, with the view toward determining whether the revealed topographic activity would differentiate levels of olfactory sensitivity by clearly identifying supra- and subthreshold odor responses. Using a continuous respiration olfactometer (CRO) to precisely deliver an odor or air stimulus synchronously with the natural respiration, air or odor (n-butanol) was randomly delivered into the inspiratory airstream during the simultaneous recording of SSVEPs and subjective behavioral responses. Subjects were placed in groups based on subjective odor detection response: “yes” and “no” detection groups. In comparison to air, SSVEP topography revealed cortical changes in response to odor stimulation for both response groups, with topographic changes evident for those unable to perceive the odor, showing the presence of a subconscious physiological odor detection response. Differences in regional SSVEP topography were shown for those who reported smelling the odor compared with those who remained unaware of the odor. These changes revealed olfactory modulation of SSVEP topography related to odor awareness and sensitivity and therefore odor concentration relative to thresholds.


2015 ◽  
Vol 8 (2) ◽  
pp. 2106-2121
Author(s):  
Hamed Ibrahem Abdelkader ◽  
Mona Abdelkader ◽  
Mohammed Kabeel ◽  
Malak Alya

Visual evoked potentials (VEPS) are obtained from optic tract by recording the evoked potentials generated by retinal stimulation. The flash VEP (FVEP) is used less frequently than pattern reversal VEP (PRVEP) because; it shows great variation in both latency and amplitude. The present study was undertaken to evaluate the effect of change of wavelength of flash and change of check size on the parameters of visual evoked potential (amplitude and latency) in normal individuals and glaucoma patients. The group of healthy subjects in the age of 20-45 years while the group of glaucoma subjects where  in the age of 25-50 years.  The two groups were exposed to flash VEP with white light and blue color and they also were exposed to checks subtending a visual angles of 15, 30,60 and 120 minutes of arc. The measured data were statistically analyzed and summarized by histograms. The interindividual and intraindividual in latencies and amplitudes for FVEP were assessed using  the coefficient of variation (COV). In conclusion, monochromatic flash VEP was preferred than white as there were minimal inter and intra individual variation of latencies and amplitudes. The most preferred check size in PRVEP was 120' for  the two groups.  


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