eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
185
198
article
Comparing the Efficiency of Two Treatment Methods of Hydrocephalus: Shunt Implantation and Endoscopic Third Ventriculostomy
Seifollah Gholampour
s.gholampour@iau-tnb.ac.ir
1
Mehrnoush Bahmani
pipco80@gmail.com
2
Azadeh Shariati
azadeh-sht@yahoo.com
3
Department of Biomedical Engineering, Faculty of Electrical & Computer Engineering, Tehran North Branch, Islamic Azad University, Tehran, Iran.
Department of Biomedical Engineering, Faculty of Electrical & Computer Engineering, Tehran North Branch, Islamic Azad University, Tehran, Iran.
Department of Biomedical Engineering, Faculty of Electrical & Computer Engineering, Tehran North Branch, Islamic Azad University, Tehran, Iran.
Introduction: Hydrocephalus is one of the most common diseases in children, and its treatment requires brain operation. However, the pathophysiology of the disease is very complicated and still unknown.
Methods: Endoscopic Third Ventriculostomy (ETV) and Ventriculoperitoneal Shunt (VPS) implantation are among the common treatments of hydrocephalus. In this study, Cerebrospinal Fluid (CSF) hydrodynamic parameters and efficiency of the treatment methods were compared with numerical simulation and clinical follow-up of the treated patients.
Results: Studies have shown that in patients under 19 years of age suffering from hydrocephalus related to a Posterior Fossa Brain Tumor (PFBT), the cumulative failure rate was 21% and 29% in ETV and VPS operation, respectively. At first, the ETV survival curve shows a sharp decrease and after two months it gets fixed while VPS curve makes a gradual decrease and reaches to a level lower than ETV curve after 5.7 months. Post-operative complications in ETV and VPS methods are 17% and 31%, respectively. In infants younger than 12 months with hydrocephalus due to congenital Aqueduct Stenosis (AS), and also in the elderly patients suffering from Normal Pressure Hydrocephalus (NPH), ETV is a better treatment option. Computer simulations show that the maximum CSF pressure is the most reliable hydrodynamic index for the evaluation of the treatment efficacy in these patients. After treatment by ETV and shunt methods, CSF pressure decreases about 9 and 5.3 times, respectively and 2.5 years after shunt implantation, this number returns to normal range.
Conclusion: In infants with hydrocephalus, initial treatment by ETV was more reasonable than implanting the shunt. In adult with hydrocephalus, the initial failure in ETV occurred sooner compared to shunt therapy; however, ETV was more efficient.
http://bcn.iums.ac.ir/article-1-1199-en.pdf
Cerebrospinal Fluid
Intracranial Pressure
Intracranial compliance
Survival curve
Reynolds number
CSF velocity
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
199
208
article
Comprehension of Complex Sentences in the Persian-Speaking Patients With Aphasia
Amir Shiani
am_shiani@yahoo.com
1
Mohammad Taghi Joghataei
neurallang@gmail.com
2
Hassan Ashayeri
ashayerih.neuroscientist@yahoo.com
3
Mohammad Kamali
mokamali@iums.ac.ir
4
Mohammad Reza Razavi
razavi_mr@yahoo.com
5
Fariba Yadegari
fariba.yadegari@gmail.com
6
Department of Radiology, Faculty of Allied Medical Sciences, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Cellular and Molecular Research Center, Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
Department of Psychiatry, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
Department of Basic Rehabilitation Sciences, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Academy of Persian Language and Literature, Tehran, Iran.
Department of Speech Therapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Introduction: To study sentence comprehension in Persian-speaking Patients with Aphasia considering the factors of complexity.
Methods: In this cross-sectional study, the performance of 6 non-fluent aphasic patients were tested and their performance was compared to 15 matched control group. Comprehension of semantically reversible sentences was assessed using a binary sentence-picture matching task. The stimuli were as follows: clefts; subject clefts and object clefts, also relative clauses; subject relatives and object relatives. All of them were types of movement-derived structures and also simple declarative sentences as the control task.
Results: The best performance of aphasic patients were seen in the comprehension of subject clefts, although prior to this result we assumed that simple declarative sentences (in which there is no structural factor of complexity) can be understood easily. They showed the highest difficulty in the comprehension of object relatives. Furthermore, the performance of patients in the comprehension of relative clauses was significantly weaker than understanding the clefts.
Conclusion: The outcomes of this study suggest that the sentence comprehension deficits of aphasic patients, in contrast to the specific deficit models, may not be related to linguistic disabilities. Moreover, the problems in the comprehension of non-canonical sentences may be related to failure in the allocation of attention. Finally, our results support the claims that neural characterization of the cognitive resources (e.g. working memory) is disrupted in sentence comprehension deficits.
http://bcn.iums.ac.ir/article-1-841-en.pdf
Sentence comprehension
Complex sentences
Syntax
Aphasia
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
209
224
article
Acute Tramadol-Induced Cellular Tolerance and Dependence of Ventral Tegmental Area Dopaminergic Neurons: An In Vivo Electrophysiological Study
Shabnam Khodayari
sh.khodayary98@gmail.com
1
Firouz Ghaderi Pakdel
info@fgpakdel.com
2
Parviz Shahabi
parvizshahabi@gmail.com
3
Somayyeh Naderi
Naderi@fgpakdel.com
4
Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran.
Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran.
Neuroscience Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Danesh Pey Hadi Co., Health Technology Incubator Center, Urmia University of Medical Sciences, Urmia, Iran.
Introduction: Ventral Tegmental Area (VTA) is a core region of the brainstem that contributes to different vital bio-responses such as pain and addiction. The Dopaminergic (DA) cellular content of VTA has major roles in different functions. This study aims to evaluate the cellular effect of tramadol on the putative VTA-DA neurons.
Methods: Wistar rats were assigned into three groups of control, sham, and tramadol-treated. The animals were anesthetized and their VTA-DA neuronal activity was obtained under controlled stereotaxic operation. The firing rate of the neurons was extracted according to principal component analysis by Igor Pro software and analyzed statistically considering P<0.05 as significant. Tramadol (20 mg/kg) was infused intraperitoneally.
Results: Overall, 121 putative VTA-DA neurons were isolated from all groups. In tramadol-treated rats, the inhibition of the neuronal firing was proposed as tolerance and the excitation period as dependence or withdrawal. The Mean±SD inhibition time lasted up to 50.34±10.17 minutes and 31% of neurons stopped firing and silenced after 24±3 min on average but the remaining neurons lowered their firing up to 43% to 67% of their baseline firing. All neurons showed the excitation period, lasted about 56.12±15.30 min, and the firing of neurons increased from 176% to 244% of their baseline or pre-injection period.
Conclusion: The tolerance and dependence effects of tramadol are related to the changes in the neuronal firing rate at the putative VTA-DA neurons. The acute injection of tramadol can initiate neuroadaptation on the opioid and non-opioid neurotransmission to mediate these effects.
http://bcn.iums.ac.ir/article-1-981-en.pdf
Tramadol
Dopamine
Ventral Tegmental Area
Firing rate
Tolerance
Dependence
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
225
234
article
Sex Differences and Role of Gonadal Hormones on Glutamate Level After Spinal Cord Injury in Rats: A Microdialysis Study
Razieh Samandari
1
Majid Hassanpour-Ezatti
2
Sajad Fakhri
Sfakhri@sbmu.ac.ir
3
Fatemeh Abbaszadeh
f.abbaszadehm@gmail.com
4
Masoumeh Jorjani
Msjorjani@sbmu.ac.ir
5
Department of Physiology, Faculty of Basic Sciences, Shahed University, Tehran, Iran.
Department of Physiology, Faculty of Basic Sciences, Shahed University, Tehran, Iran.
Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Introduction: Sex differences in outcomes of Spinal Cord Injury (SCI) suggest a sex-hormone-mediated effect on post-SCI pathological events, including glutamate excitotoxicity. This study aimed to investigate the importance of gonadal hormones on glutamate release subsequent to SCI in rats.
Methods: After laminectomy at T8-T9, an electrolytic lesion was applied to the spinothalamic tracts of male and female rats. Using spinal microdialysis, we assessed glutamate levels at the site of lesion in both intact and gonadectomized rats for 4 hours. In this way, we examined the sex differences in the glutamate concentrations.
Results: The peak retention time of glutamate level was 10.6 min and spinal glutamate concentration reached a maximum level 40 min following SCI. In male SCI rats, gonadectomy caused a significant elevation of glutamate level (P<0.001) following injury which was maximum 40 min post-SCI as well. However, no significant alterations were seen in gonadectomized female rats.
Conclusion: The significant differences in glutamate levels between both intact and gonadectomized SCI male and female rats show the sex-hormone-related mechanisms underlying the molecular events in the second phase of SCI. It seems that the role of male gonadal hormones to prevent glutamate excitotoxicity is more prominent. The exact mechanisms of these hormones on the functional recovery after SCI should be clarified in further studies.
http://bcn.iums.ac.ir/article-1-1136-en.pdf
Spinal Cord Injury
Microdialysis
Glutamate
Sex hormones
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
235
244
article
The Effects of Inactivation of Pedunculopontine Tegmental Nucleus by Cobalt (II) Chloride on Cardiovascular Responses in Hemorrhagic Hypotensive Rats
Reza Mohebbati
mohebbatir931@mums.ac.ir
1
Mahmoud Hosseini
hosseinim@mums.ac.ir
2
Majid Khazaei
khazaeim@mums.ac.ir
3
Abolfazl Khajavirad
khajavirada@mums.ac.ir
4
Mohammad Naser Shafei
shafeimn@mums.ac.ir
5
Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Neurocognitive Sciences, Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Introduction: Based on the evidence, the Pedunculopontine Tegmental nucleus (PPT) is involved in cardiovascular function regulation. In this study, the probable role of PPT on cardiovascular parameters in the hypotension induced by Hemorrhage (HEM) was evaluated.
Methods: The study rats were divided up into 5 groups: 1. Control (Saline); 2. Cobalt(II) chloride (CoCl2); 3. HEM; 4. Saline+HEM; and 5. CoCl2+HEM. Their right and left femoral arteries were cannulated for recording the cardiovascular responses and blood withdrawal, respectively. Saline and CoCl2 were microinjected into the PPT using the stereotaxic apparatus. Maximum changes of Systolic Blood Pressure (SBP), Mean Arterial Pressure (MAP), and the Heart Rate (HR) after the microinjection of CoCl2 in normal and Hemorrhage conditions were recorded. Changes of SBP, MAP, and HR were calculated over time at 5-min intervals and compared with those of the control and HEM groups using repeated measures ANOVA. The Independent sample t-test was used to compare the changes in cardiovascular parameters between the control and HEM groups at 0 and 20 min after Hemorrhage.
Results: The changes in SBP, MAP, and HR in the CoCl2 group were not significantly different from those in the control group. In the HEM group, the SBP and MAP changes significantly decreased (P<0.001) and HR changes significantly increased (P<0.001) compared to those parameters in the control group. In the CoCl2+HEM group, SBP and MAP changes were significantly attenuated compared to those in the HEM group (P<0.05) and HR changes induced by Hemorrhage decreased compared to that in the HEM group (P<0.01).
Conclusion: Our results indicate that the PPT has no effects on normal cardiovascular parameters. However, it could modulate cardiovascular responses induced by Hemorrhage.
http://bcn.iums.ac.ir/article-1-1081-en.pdf
Hemorrhage
Cobalt (II) chloride
Blood pressure
Heart rate
Pedunculopontine Tegmental nucleus (PPT)
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
245
256
article
Comparing Steady-State Visually Evoked Potentials Frequency Estimation Methods in Brain-Computer Interface With the Minimum Number of EEG Channels
Mehrnoosh Neghabi
mehrnoosh_neghabi@yahoo.com
1
Hamid Reza Marateb
h.marateb@eng.ui.ac.ir
2
Amin Mahnam
mahnam@eng.ui.ac.ir
3
Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.
Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.
Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.
Introduction: Brain-Computer Interface (BCI) systems provide a communication pathway between users and systems. BCI systems based on Steady-State Visually Evoked Potentials (SSVEP) are widely used in recent decades. Different feature extraction methods have been introduced in the literature to estimate SSVEP responses to BCI applications.
Methods: In this study, the new algorithms, including Canonical Correlation Analysis (CCA), Least Absolute Shrinkage and Selection Operator (LASSO), L1-regularized Multi-way CCA (L1-MCCA), Multi-set CCA (MsetCCA), Common Feature Analysis (CFA), and Multiple Logistic Regression (MLR) are compared using proper statistical methods to determine which one has better performance with the least number of EEG electrodes.
Results: It was found that MLR, MsetCCA, and CFA algorithms provided the highest performances and significantly outperformed CCA, LASSO, and L1-MCCA algorithms when using 8 EEG channels. However, when using only 1 or 2 EEG channels d, CFA method provided the highest F-scores. This algorithm not only outperformed MLR and MsetCCA when applied on different electrode montages but also provided the fastest computation time on the test set.
Conclusion: Although MLR method has already demonstrated to have higher performance in comparison with other frequency recognition algorithms, this study showed that in a practical SSVEP-based BCI system with 1 or 2 EEG channels and short-time windows, CFA method outperforms other algorithms. Therefore, it is proposed that CFA algorithm is a promising choice for the expansion of practical SSVEP-based BCI systems.
http://bcn.iums.ac.ir/article-1-968-en.pdf
Brain-Computer Interface (BCI)
Electroencephalogram (EEG)
Feature extraction
Steady-State Visually Evoked Potential (SSVEP)
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
257
268
article
The Effect of Prostration (Sajdah) on the Prefrontal Brain Activity: A Pilot Study
Fateme Yousefzadeh
fatemehyousefzadeh@gmail.com
1
Gila Pirzad Jahromi
g_pirzad_jahromi@yahoo.com
2
Ehsan Mokari Manshadi
az.ravanshenasi@yahoo.com
3
Boshra Hatef
boshrahatef@yahoo.com
4
Medical Engineering, Alberta, Canada.
Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Introduction: “Sajdah”, a prostration position, is part of Muslim daily prayers. It seems to have several effects on the brain and heart function. This study aimed to investigate the prefrontal brain activity after 10 seconds of Sajdah in the direction of Qibla (the direction that a Muslim prays) while putting the forehead on the ground.
Methods: Three women and two men participated in this pilot study. Linear (absolute and relative power of θ (4-8Hz), α 1 (8-10 Hz), α 2 (10-12 Hz), β 1 (12-16 Hz), β 2 (16-20 Hz), β 3 (20-30 Hz), γ 1 (30-40 Hz), γ 2 (40-50 Hz) and non-linear features (approximate entropy, Katz fractal dimension, Petrosian fractal dimension, spectral entropy, and sample entropy) from Fps channel were calculated.
Results: The relative β to γ band, approximate and sample entropy, Petrosian fractal dimension and mean of amplitude decreased in open eye state in women. While θ to γ bands in the closed eye state decreased after Sajdah in women. The absolute γ bands in closed eye state and relative β band in open eye state increased after Sajdah in men.
Conclusion: The pilot study showed that 10 seconds of Sajdah has effects on brain activity and sometimes showed the opposite effect on genders.
http://bcn.iums.ac.ir/article-1-1014-en.pdf
Sajdah
EEG
Non-linear analysis
Brain activity
Gender
eng
Iran University of Medical Sciences
Basic and Clinical Neuroscience
2008-126X
2228-7442
2019-05
10
3
269
279
article
The Effects of Counting the Stride Numbers on the Parkinsonian Gait: Suggesting a Possible Reason for Dual Task Interference
Yashar Sarbaz
yashar22c@yahoo.com
1
Hakimeh Pourakbari
h.pourakbari@yahoo.com
2
Department of Mechatronics Engineering, School of Engineering Emerging Technologies, University of Tabriz, Tabriz, Iran.
Department of Mechatronics Engineering, School of Engineering Emerging Technologies, University of Tabriz, Tabriz, Iran.
Introduction: Parkinson Disease (PD) is a degenerative and progressive disorder of the central nervous system. It results from degeneration of Substantia Nigra pars compacta (SNc) of the Basal Ganglia (BG). Gait disturbances in PD patients generally get worse over time. The underlying mechanism of gait disturbances in PD has not been elucidated yet.
Methods: In this study, we tried to analyze changes in walking performance under both single- and dual-task conditions in people with PD compared to healthy subjects. To this end, the participants’ trunk acceleration signals were recorded under dual-task (counting the stride number while walking) and single-task (walking without performing any other secondary tasks) conditions.
Results: The healthy subjects counted the number of their strides correctly; however, 85% of the patients made glaring errors in counting. Then variances of Stride Time Interval (STI) signals were calculated for each participant. STI signals of the patients had a higher variance than that of the healthy subjects in the dual-task condition. Separating the two groups in a dual-task condition is easier. Therefore, we think that the disease sate can be detected in early stages. It is thought that counting is performed independent of walking.
Conclusion: PD affects the function of BG that leads to motor timing dysfunction. So, it seems that timing in motor tasks is disrupted while timing in cognitive tasks is not. Therefore, perhaps inconsistency between the two clocks (motor-tasks and cognitive-tasks clocks) is the main cause of dual-task interference in patients’ gait.
http://bcn.iums.ac.ir/article-1-966-en.pdf
Parkinson's Disease
Early diagnosis
Internal biological clock
Dual-task