Browsing by Author "Yaman O."

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    The results of nucleoplasty in patients with lumbar herniated disc: a prospective clinical study of 52 consecutive patients
    (2007) Mirzai H.; Tekin I.; Yaman O.; Bursali A.
    Background context: Nucleoplasty is a minimally invasive, percutaneous procedure that uses radiofrequency energy to ablate nuclear material and create small channels within the disc. Purpose: To evaluate the efficacy of nucleoplasty technique in patients with leg pain caused by radicular encroachment. Study design/setting: A prospective clinical study of subjects with lumbar disc herniation, and radicular pain resistant to previous medical treatment and physiotherapy for a period of at least 3 months. Patient sample: Fifty-two consecutive patients with leg pain and magnetic resonance imaging evidence of small and medium-sized herniated discs correlating with the patient's symptoms (contained disc herniation<6 mm, with a disc height≥50% in comparison to normal adjacent discs) were included. Outcome measures: Visual analogue scale (VAS) was administered and Oswestry disability questionnaires were filled out at preprocedure and postprocedure 2 weeks, 6 months, and 1 year. Reduction of analgesic treatment and the patients' satisfaction were also recorded. Methods: All procedures were performed under local anesthesia and fluoroscopic guidance on an outpatient basis. Patients underwent discography to evaluate annular integrity just before nucleoplasty. Channels were created in the nucleus by advancing the radiofrequency probe (ablating) and withdrawing it (coagulation). In all patients six channels were created. Results: Thirty-four patients had one and 18 had two discs treated; a total of 70 procedures were performed. Mean age of patients was 44.8±8.6 years. The mean follow-up period was 12.1±1.6 months. Mean VAS reduced from preprocedure 7.5 to 3.1 at postprocedure 6 months and to 2.1 at the latest follow-up. Mean Oswestry index decreased from 42.2 to 24.8 at 6 months and to 20.5 at the latest examination. Analgesic consumption was stopped or reduced in 42 patients (85%) at 6 months and in 46 patients (94%) 1 year after the procedure. Overall patient satisfaction was 81% at 2 weeks, 85% at 6 months, and 88% at the latest follow-up. There were no complications related to the procedures. Conclusions: Our results encourage us to use nucleoplasty in carefully selected patients with leg pain caused by radicular encroachment. We recommend applying this minimally invasive technique only in those patients with small (<6 mm) contained disc herniations, with a disc height of≥50% and with annular integrity. © 2007 Elsevier Inc. All rights reserved.
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    Hyperbaric oxygen treatment in the experimental spinal cord injury model
    (Elsevier Inc., 2014) Yaman O.; Yaman B.; Aydin F.; Var A.; Temiz C.
    Background context Spinal cord trauma is a major cause of mortality and morbidity. Although no known treatment for spinal cord injury exists, a limited number of effective treatment modalities and procedures are available that improve secondary injury. Hyperbaric oxygen (HBO) treatment has been used to assist in neurologic recovery after cranial injury or ischemic stroke. Purpose To report the findings on the effectiveness of HBO treatment on rats with experimental traumatic spinal cord injury. Improvement was evaluated through motor strength assessment and nitrite level assay testing. Study design We randomly distributed 40 rats among 5 groups of 8 rats each: sham incurable trauma, induced trauma, HBO treatment begun at the 1st hour, HBO treatment begun at the 6th hour, and HBO treatment begun at the 24th hour. Method The HBO treatment was administered to rats in three of the groups and conducted in two 90-minute sessions, under an absolute atmospheric pressure of 2.4 at 100% oxygen for 5 days. In the motor strength evaluations, all the rats were observed during the inclined plane test and clinical motor examination on the first, third, and fifth days. In addition, the nitrite levels of spinal cord tissues on the sixth day were also studied. Results Results from the inclined plane levels and motor strength test from all the three groups undergoing HBO treatment were higher than those from Group 2. It was also determined that early HBO treatment resulted in higher recovery rates (groups 3 and 4). The highest levels were seen in the group in which the HBO treatments were started in the first hour (Group 3). It was noted that nitrite levels of rats in the group exposed to trauma increased, compared with the sham group, but increased levels also diminished after HBO treatments. Again, the greatest decrease in nitrite levels was evident in the group where the HBO treatment was started the earliest (Group 3). Conclusions Prompt HBO treatment after trauma significantly contributed to the clinical, histopathologic, and biochemical recovery of the rats. © 2014 Elsevier Inc. All rights reserved.
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    A comparison of bilateral decompression via unilateral approach and classic laminectomy in patients with lumbar spinal stenosis: A retrospective clinical study
    (Turkish Neurosurgical Society, 2015) Yaman O.; Ozdemir N.; Dagli A.T.; Acar E.; Dalbayrak S.; Temiz C.
    Aim: Bilateral decompression via unilateral approach is one of the minimally invasive methods used for degenerative spinal stenosis. The aim of this retrospective study was to observe the clinical and radiological results of classic laminectomy and bilateral decompression via unilateral approach applied for lumbar stenosis. Material and methods: The data of 40 patients who underwent surgical treatment for lumbar spinal stenosis with different techniques was reviewed retrospectively. The patients were divided into 2 groups according to the surgical technique. In the first group, patients underwent classic laminectomy, while in the second group patients underwent bilateral decompression via unilateral approach. Preoperative and postoperative computed tomography section areas of both groups were examined. Visual analogue scale (VAS) was used to evaluate low back and leg pain in preoperative and postoperative 1, 6, and 12 months. The two groups were compared in respect of surgery time and bleeding. Results: In both groups, postoperative low back and leg pain VAS scores declined compared to the preoperative condition. Low back pain VAS scores were lower at postoperartive 1, 6, and 12 months. The bleeding was higher in the 1st group, whereas the surgery time was higher in the 2nd group. Conclusion: Bilateral decompression through unilateral approach is an effective method without instability effect, which provides sufficient decompression in the degenerative stenosis and increases patient comfort in the postoperative period.
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    Dynamic Fuzzy Cognitive Maps-Based Crowd Analysis Using Time Series Obtained From Video Processing
    (Institute of Electrical and Electronics Engineers Inc., 2025) Goktug Altundogan T.; Karakose M.; Yaman O.; Tanberk S.; Mert F.; Egemen Yilmaz A.
    Fuzzy cognitive maps treat the components of a problem or system expressed as fuzzy concepts and model the system with the relationships between these concepts. We predicted that FCM' s approach to calculating with these relationships could perform multivariate time-series forecasting with high performance. However, especially in real-world systems and related data sets, numerical values that clearly express the relationships between time series elements are not included, and this is a challenge. Another challenge that FCMs have for these problems is that real-world systems are highly dynamic structures and these relationships have variable properties in different situations. We evaluated these challenges as the main motivation factor and developed a GA-based method to determine system relationships for different states of the system. Then, in order to dynamically handle these relationships determined for different states on FCM, we took advantage of neural architectures that take the initial concept vectors as input and calculate the relationships between these concepts. In order to evaluate the performance of the time-series forecasting approach we developed, we performed time-series forecasting on two different scenarios using an artificially generated data set and a benchmark data set containing real-world data. In this way, we saw that the time series modeling performance of our proposed system is over 95%. FCMs perform the calculations they have made until the system becomes stable. This allows time series analyses to be performed not only depending on time but also depending on the steady state. Therefore, using this capability of the approach we developed to model time series formed from crowd analysis data obtained with video analytics is quite suitable in terms of providing the contribution points we present in this article. In this context, we integrated our FCM-based time series forecasting approach to two different video analytics scenarios by applying two different crowd analysis approaches we developed within the scope of this study. The success of our proposed method is over 95% both for performing for forecasting the time series obtained as a result of crowd analysis. Beside, crowd analysis approaches developed in this study have similar performance to state of the art approaches in the literature. © 2013 IEEE.