scholarly journals BIOMECHANICAL ASSESSMENT OF SPINE DEFORMITIES IN BEKHTEREV’S DISEASE

2005 ◽  
pp. 040-049
Author(s):  
Aleksandr Vjacheslavovich Gladkov ◽  
Viktor Viktorovich Rerikh
Keyword(s):  
Sagittal Plane ◽  
Deformity Correction ◽  
Flexion Deformity ◽  
Biomechanical Assessment ◽  
Spine Shape ◽  
Spine Deformities ◽  
Before And After ◽  
Orthostatic Position ◽  
Lumbar Kyphosis

Objective. To analyze the dependence of the spine shape and orientation in a sagittal plane on localization of a flexion deformity associated with Bekhterev’s disease, and the outcomes of surgical deformity correction. Material and Methods. The kinematic analysis of sagittal plane spondylograms of 44 patients (43 men and 1 woman, aged 21 to 49 years) with Bekhterev’s disease before and after surgery was performed basing on author’s classification of kyphotic deformities. Illness duration was 7 to 22 years. Results. One-level correction vertebrectomy caused the increase of lordosis at two or three levels in 50 % of cases. Correction vertebrectomy for flat lumbar kyphosis resulted in normalization of all biomechanical spine parameters characterizing its shape and sagittal orientation in 100 % of cases. Lumbar vertebrectomy for flexion deformity in the thoracic spine normalized sagittal position of vertebrae only in isolated segments. Cosmetic hyperkyphosis remained, though the trunk orthostatic position had been restored. Similar results were recorded in the group with multilevel deformities. Lost of correction at vertebrectomy level and progression of flexible deformity above vertebrectomy were not revealed. Kyphotic deformity formation (ranged 16.0° to 32.0°) at the segments caudal to vertebrectomy was observed in 10 % of cases. Conclusion. Flexion deformity localization in the spine determines the condition of its further progression in many respects. Correction lumbar vertebrectomy while reconstructing orthostatic trunk position does not always result in complete normalization of vertebra sagittal position in anchylosis spine.

Body balance in a free-standing position in road and off-road cyclists

2014 ◽  
Vol 6 (4) ◽  
Author(s):  
Paulina Hebisz ◽  
Rafal Hebisz ◽  
Marek Zaton
Keyword(s):  
Sagittal Plane ◽  
Standing Position ◽  
The Body ◽  
Free Standing ◽  
Body Balance ◽  
Eyes Closed ◽  
Road Cycling ◽  
Progressive Exercise ◽  
Before And After ◽  
Road Cyclists

AbstractBackground: The purpose of this study was to compare body balance in road and off-road cyclists, immediately before and after the racing season.Material/Methods: Twenty individuals participated in the study and they were divided into two groups: specialists in road-cycling (n = 10) and in off-road cycling (n = 10). Immediately before and after the five-month racing season stabilographic trials were carried out (at rest and after progressive exercise). In assessing body balance the distance and velocity of the centre shifts (in the anterior-posterior and left-right direction) were analysed. The tests were performed with the cyclists’ eyes open, eyes closed, and in feedback.Results: After the racing season, in the off-road cyclists’ group, distance and velocity of the centre of pressure shifts increased after a progressive exercise.Conclusions: In the off-road cyclists’ group the balance of the body in the sagittal plane deteriorated after the racing season. Moreover, after the racing season off-road cyclists were characterized by a worse balance of the body, compared to road cyclists

Detection of Vigil And Fatigue States During The Execution of Laparoscopic Tasks Based On EEG Patterns

2021 ◽  
Author(s):  
Yeremi Pérez ◽  
Roberto Borboa-Gastelum ◽  
Luz Maria Alonso-Valerdi ◽  
David I. Ibarra-Zarate ◽  
Eduardo A. Flores-Villalba ◽  
...  
Keyword(s):  
Medical Students ◽  
Individual Component ◽  
Support Vector ◽  
Patient Death ◽  
Professional Activities ◽  
Health Area ◽  
Before And After ◽  
Lack Of Sleep ◽  
Eeg Signal Processing

Abstract Fatigue decreases performance in several professional activities. Fatigue can lead to commit technical mistakes which consequences might be lethal, such as in health area, where a surgical error due to the absence of rest can provoke the patient death. Therefore, this study aims to detect vigil and fatigue (due to lack of sleep) states in medical students through the classification of electroencephalographic (EEG) patterns. The EEG signals of 18 physician students were analyzed within theta band (4 - 8 Hz) over front-central recording sites, and alpha band (8 - 13 Hz) rhythms over temporal and parieto-occipital recording sites during the execution of laparoscopic tasks before and after their medical duties. The EEG signal processing pipeline consisted in pre-processing based on individual component analysis, absolute band power estimates, and Support Vector Machine classification. The F-score to differ between vigil and fatigue states was 90.89%, where the first class was slightly more identifiable reaching a sensitivity of 90.18%. Based on this outcome, the detection of fatigue in medical students while their laparoscopic training seems achievable and feasible to diminish technical mistakes that could be lethal in health area. For this purpose, EEG recording are provided.

Study on Effect of Spheroidization on Hazardous Classification of ADN

2021 ◽  
Vol 881 ◽  
pp. 71-76
Author(s):  
Jian Yang ◽  
Hong Bin Li ◽  
Song Tao Ren ◽  
Peng Gang Jin ◽  
Zan Gao
Keyword(s):  
Temperature Stability ◽  
Impact Sensitivity ◽  
Classification Method ◽  
Ammonium Dinitramide ◽  
Classification Procedure ◽  
Research Results ◽  
Before And After ◽  
Hazard Classification ◽  
Friction Sensitivity

In order to determine the influence of spheroidization process of Ammonium dinitramide’s hazard grade, the hazardous division of Ammonium dinitramide before and after spheroidization is studied by using hazard classification procedure for combustible and explosive substances and articles standard (WJ20405) and hazard classification method and criterion for combusitible and explosive substances and articles standard (WJ20404). The research results show that spheroidization process can significantly improve the temperature stability of Ammonium dinitramide and significantly reduce friction sensitivity and impact sensitivity of Ammonium dinitramide. So spheroidization process can reduce the hazardous of Ammonium dinitramide and improve the safe character of Ammonium dinitramide.

Classification of Brain Signal Activities Before and After Consuming Soy Peptide Using Fuzzy Logic

2021 ◽  
Author(s):  
Arjon Turnip ◽  
Gilbert F. Y. Sihombing ◽  
Giraldo F. J. Sihombing ◽  
George Michael Tampubolon ◽  
Peri Turnip ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Before And After

Lateral Thoracolumbar Listhesis as an Independent Predictor of Disability in Adult Scoliosis Patients: Multivariable Assessment Before and After Surgical Realignment

Neurosurgery ◽  
2021 ◽  
Author(s):  
Alan H Daniels ◽  
Wesley M Durand ◽  
Renaud Lafage ◽  
Andrew S Zhang ◽  
David K Hamilton ◽  
...  
Keyword(s):  
Cobb Angle ◽  
Multivariable Analysis ◽  
Deformity Correction ◽  
Adult Scoliosis ◽  
Leg Pain ◽  
Minimally Clinically Important Difference ◽  
Before And After ◽  
Plane Deformity ◽  
Numeric Scale

Abstract BACKGROUND Lateral (ie, coronal) vertebral listhesis may contribute to disability in adult scoliosis patients. OBJECTIVE To assess for a correlation between lateral listhesis and disability among patients with adult scoliosis. METHODS This was a retrospective multi-center analysis of prospectively collected data. Patients eligible for a minimum of 2-yr follow-up and with coronal plane deformity (defined as maximum Cobb angle ≥20º) were included (n = 724). Outcome measures were Oswestry Disability Index (ODI) and leg pain numeric scale rating. Lateral thoracolumbar listhesis was measured as the maximum vertebral listhesis as a percent of the superior endplate across T1-L5 levels. Linear and logistic regression was utilized, as appropriate. Multivariable analyses adjusted for demographics, comorbidities, surgical invasiveness, maximum Cobb angle, and T1-PA. Minimally clinically important difference (MCID) in ODI was defined as 12.8. RESULTS In total, 724 adult patients were assessed. The mean baseline maximum lateral thoracolumbar listhesis was 18.3% (standard deviation 9.7%). The optimal statistical grouping for lateral listhesis was empirically determined to be none/mild (<6.7%), moderate (6.7-15.4%), and severe (≥15.4%). In multivariable analysis, listhesis of moderate and severe vs none/mild was associated with worse baseline ODI (none/mild = 33.7; moderate = 41.6; severe = 43.9; P < .001 for both comparisons) and leg pain NSR (none/mild = 2.9, moderate = 4.0, severe = 5.1, P < .05). Resolution of severe lateral listhesis to none/mild was independently associated with increased likelihood of reaching MCID in ODI at 2 yr postoperatively (odds ratio 2.1 95% confidence interval 1.2–3.7, P = .0097). CONCLUSION Lateral thoracolumbar listhesis is associated with worse baseline disability among adult scoliosis patients. Resolution of severe lateral listhesis following deformity correction was independently associated with increased likelihood of reaching MCID in ODI at 2-yr follow-up.

Rule-based algorithm for the classification of sitting postures in the sagittal plane from the Cardiff Body Match measurement system

2013 ◽  
Vol 38 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Janusz Kulon ◽  
Adam Partlow ◽  
Colin Gibson ◽  
Ian Wilson ◽  
Steven Wilcox
Keyword(s):  
Measurement System ◽  
Sagittal Plane ◽  
Rule Based

scholarly journals 3D kinematic analysis of patients’ gait before and after unilateral total hip replacement

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Kateřina Kolářová ◽  
Tomáš Vodička ◽  
Michal Bozděch ◽  
Martin Repko
Keyword(s):  
Range Of Motion ◽  
Total Hip Replacement ◽  
Kinematic Analysis ◽  
Hip Replacement ◽  
Sagittal Plane ◽  
Frontal Plane ◽  
Step Length ◽  
Total Hip ◽  
Before And After ◽  
Analysis System

Purpose: The purpose of the study was to describe changes in the kinematic parameters in the patients’ gait after total hip replacement. Methods: Research group of men in the end stage of osteoarthritis indicated to the THR (n = 10; age 54.1 ± 7.5 years; weight 92.2 ± 9.6 kg; height 179.7 ± 5.9 cm). All participants underwent a total of three measurements: before surgery, 3 and 6 months after the surgery. Using the 3D kinematic analysis system, the patients’ gait was recorded during each measurement session and kinematic analysis was carried out. The parameters that were monitored included the sagittal range of motion while walking in the ankle, the knee and the hip joints of the operated and the unoperated limb, and the range in the hip joint’s frontal plane, the rotation of pelvis in the frontal and transverse planes, as well as the speed of walking and the walking step length. Results: Significant increases were found in sagittal range of motion in the operated hip joint, sagittal range of motion in the ankle joint on the unoperated side and in the walking step length of the unoperated limb. Conclusions: During walking after a THR, the sagittal range of motion in the ankle of the unoperated limb increases. Also, the range of motion in the sagittal plane on the operated joint increases, which is related to the lengthening of the step of the unoperated lower limb.

scholarly journals Multiresolution analysis of vibration signals acquired from locomotive Diesel engine for classification of engine states basing on signal statistical parameters

2017 ◽  
Vol 168 (1) ◽  
pp. 68-72
Author(s):  
Piotr BOGUŚ ◽  
Mateusz CIESZYŃSKI ◽  
Jerzy MERKISZ
Keyword(s):  
Diesel Engine ◽  
Complex Analysis ◽  
Statistical Parameters ◽  
Vibration Signals ◽  
Time Frequency ◽  
Significant Difference ◽  
Before And After ◽  
On Line ◽  
Locomotive Diesel

The paper presents a method of classification of locomotive Diesel engine states basing on vibration signals taken from an engine body and using chosen statistical parameters calculated for the original signal and it wavelet multiresolution components. The researches presented in the paper concern estimation of an engine states before and after a general repair. The target application of the presented researches is an on-line diagnostic system which can complement standard OBD systems. To this purpose the applied methods should not base on complex analysis of some spectral, time-frequency or scalogram plots but rather on choosing single diagnostic parameters which are suitable for the fast on-line diagnostic. The results have showed the significant difference in distinguishing of engine work before and after a general repair using some chosen statistical parameters applied to vibration signals.

scholarly journals Discrete plasmapheres method possibilities in improving peripheral microcirculation in patients with atherosclerosis of the arteries of low extremities

2015 ◽  
Vol 14 (4) ◽  
pp. 18-21
Author(s):  
Y. S. Andozhskaya ◽  
A. N. Galileyeva
Keyword(s):  
Clinical Status ◽  
Spectral Characteristics ◽  
Suggested Method ◽  
Peripheral Artery ◽  
Doppler Flow ◽  
Before And After ◽  
Peripheral Microcirculation ◽  
Flow Changes ◽  
Artery Disease

Introduction and aim. In this study discrete plasmapheres method possibilities in the treatment of the patients with III stage of peripheral artery disease were investigated. The aim of current investigation was to find out the changes of the peripheral microcirculation. Materials and methods: microcirculation was investigated with Minimax-Doppler Ê device before and after treatment of 48 patients with intermittent claudication. Results and discussion. It was found that peripheral microcirculation data and spectral characteristics of Doppler flow changes and clinical status of the patients eventually improved after treatment by suggested method. In conclusion, treatment by suggested method of discrete plasmapheres is effective on one of the most complicated group of patients with III stage of ischemia according to Fontaine-Pokrovsky classification of atherosclerosis of the arteries of low extremities.

scholarly journals Human Polyomavirus-Associated Cerebral Disorders in the Post-HAART Era

2011 ◽  
Vol 2011 ◽  
pp. 1-3 ◽  
Author(s):  
Filiberto Cedeno-Laurent ◽  
Augusto C. Penalva de Oliveira ◽  
José E. Vidal ◽  
J. Roberto Trujillo
Keyword(s):  
Highly Active Antiretroviral Therapy ◽  
Sudden Onset ◽  
Human Polyomavirus ◽  
Survival Times ◽  
Highly Active ◽  
Before And After ◽  
Autoimmune Conditions ◽  
Inflammatory Syndrome ◽  
Hiv 1

Human polyomavirus JC is the causative agent of a deadly form of sudden onset dementia, progressive multifocal leukocoencephalopathy (PML). PML is highly prevalent in immunodeficient populations, specially those undergoing chemotherapy, immunosuppressive treatments for autoimmune conditions, and HIV-1/AIDS patients. In fact, before the highly active antiretroviral therapy (HAART) regimens became available, PML was a leading cause of death in HIV-1 seropositive individuals. However, patients under HAART show increased survival times with better prognoses. In this report we described the main differences between PML before and after the HAART era; highlighting the new patterns of presentation, the neurotropism of other human polyomaviruses, and the increased prevalence of immune reconstitution inflammatory syndrome (IRIS), as a complication of PML in patients under HAART. Lastly, we propose a revised classification of human poliomavirus-associated cerebral disorders that may reflect more accurately what clinicians encounter in their everyday practice.

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