research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
4.MOTOR EVOKED POTENTIAL IN PATIENTS WITH PARKINSON’S DISEASE: A TRANSCRANIAL MAGNETIC STIMULATION STUDY

Authors: Ali F. Al-Hashimi علي فؤاد الهاشمي --- Haneen R. Ahmed حنين رباح احمد
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2018 Volume: 16 Issue: 1 Pages: 14-21
Publisher: Al-Nahrain University جامعة النهرين

Loading...
Loading...
Abstract

Background:Parkinson’s disease (PD) is a neurodegenerative condition of the central nervous system, which is accompanied by the impairment of the cortico-subcortical excitation and inhibition systems. It is characterized by motor and non-motor symptoms, having both hypokinetic and hyperkinetic features.Objective:To investigate the integrity of the central motor pathways by studying the motor evoked potential (MEP) latencies, amplitudes and central conduction time (CMCT) of the median nerve in patients with PD as compared to healthy controls.Methods:Twenty-five patients with documented PD were studied; with a mean age of (63.16±5.49 years) as compared to 25 age and sex matched apparently healthy controls. All subjects were instructed about the examination and informed consent was provided. Transcranial magnetic stimulation TMS-MEP study of the right median nerve was done. Cortical and cervical latencies and amplitudes of the MEP study were determined. The responses were recorded with both relaxed and slightly contracted target muscle. CMCT calculation was done by subtraction of the latency of peripheral segment of the motor pathway (spinal motor root to muscle) from that of the entire motor pathway (motor cortex to muscle) or by calculation of the CMCT with the F-wave method. Results:The means of the cortical latencies of PD patients during relaxation and facilitation states were lower than controls; and the differences were significant for both (P=0.03 and 0.02; respectively). In both relaxed and facilitation states, the means of CMCT in PD patients were lower than in control and the difference was significant during contraction (P=0.02), and near statistical significance during relaxation (P=0.08). CMCT calculations by the estimation of F wave and distal motor latency (DML) were equivocal between relaxation and facilitation states. Nevertheless, the differences were not statistically significant (P=0.45; P=0.62; respectively). The means of the MEP amplitude of PD patients were lower than controls (4.21±1.94 versus 4.28± 1.84 mV; respectively). Nevertheless, the differences were not significant (P=0.89).Conclusion:Single-pulse TMS is a valuable study to investigate central motor dysfunction in PD. CMCT measurement of the median nerve or any nerve in the upper limb is a potential marker for the evaluation of the severity of PD; especially in the facilitated state.Keywords:Parkinson’s disease, TMS, MEP, CL, CMCTCitation:Ahmed HR, Al-Hashimi AF. Motor evoked potential in patients with Parkinson’s Disease: a transcranial magnetic stimulation study. Iraqi JMS. 2018; Vol. 16(1): 14-21. doi: 10.22578/IJMS.16.1.4

Keywords

Parkinson’s disease --- TMS --- MEP --- CL --- CMCT


Article
A New Technique Of Microcomputer Based Overcurrent Relay
تقنية جديدة لمرحلة فرط التيار باستخدام الحاسب الدقيق

Author: Mohammed Yahya Suliman محمد يحيى سليمان
Journal: AL Rafdain Engineering Journal مجلة هندسة الرافدين ISSN: 18130526 Year: 2008 Volume: 16 Issue: 5 Pages: 9-19
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Abstract A new technique of three phase overcurrent relay is described in this paper. The performance of the new design shows the ability to obtain any shape of characteristic using exponential type model with high accuracy. Also the new design used more accuracy, fast measurement for peak detection with error less than 2%. The relay tested for normal and very inverse characteristics, also tested for line-to-line fault the results show the ability of discrimination the fault current and isolate the section of the system affected by a fault so that the remaining system can continue to operate normally.Key-words: overcurrent relay, Peak detector, time coordination margin (TC), time multiplier setting (TMS), Programmable Peripheral Interface 8255 (PPI).

الخلاصة تضمن البحث تقنية جديدة في ملرحلة فرط التيار ثلاثية الطور. ان اداء التصميم الجديد اضهر القابلية العالية على تمثيل اي شكل لمنحني التيار-الزمن العكسي بأستعمال المعادلة الأسية و بدقة عالية. كما يتميز التصميم الجديد بأستعمال دائرة تحسس القيمة العظمى التي تتميز بسرعة قياس عالية و دقة تصل نسبة الخطأ فيها أقل من ٢%. تم أختبار المرحلة لنوعين من منحنيات التيار-الزمن العكسي , كما تم أختبار المرحلة في حالة عطل (طور-طور) و أظهرت النتائج تمييز تيار العطل و عزل الجزء العاطل من الشبكة مع بقاء عمل باقي الشبكة بشكل طبيعي.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2018 (1)

2008 (1)