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Cristian Balcescu,Khalid Odeh,Alexander Rosinski,Jonathan Wang,Priya Prasad,Jeremi Leasure,Victor Ungurean Jr.,Dimitriy Kondrashov 대한척추신경외과학회 2019 Neurospine Vol.16 No.4
Objective: Pyogenic spinal infections account for 2%–4% of orthopaedic infections. They are often difficult to diagnose, resulting in a delay in diagnosis. Risk factors for orthopaedic and spinal infection are well-documented in the literature, yet there is a paucity of studies examining risk factors specifically for multifocal spinal infections. The objective of this study was to identify predictors of multifocal spinal infections in comparison to unifocal spinal infections. Methods: The medical records, imaging studies, and bacteriology data of 20 patients treated surgically for pyogenic spinal infection over 6 years at a tertiary referral center were reviewed and analyzed after receiving Institutional Review Board approval. Univariate and multivariate analyses were performed to identify factors associated with a multifocal spinal infection. Results: Seven patients (35%) had multifocal infections. Three were bifocal, and 4 were trifocal. Patients with surgically treated cervical or thoracic spinal infections had a high rate of concomitant multifocal spinal infections (71% and 83%, respectively). Other potential predictors (e.g., patient age, body mass index, magnetic resonance image findings, etc.) did not reach statistical significance. Each of the multifocal infections involved the lumbar spine. Conclusion: In this study, the spinal region was the only statistically significant risk factor for multifocal infection. Patients who are diagnosed with a spinal infection that requires operative treatment should have their entire spine evaluated with magnetic resonance imaging to detect multifocal involvement promptly.
Optimization of Diesel Fuel Injection System with Numerical Analysis.
J.O.Chae,S.M.Lee,J.W.Hwang,I.J.Yang,V.V.Kondrashov,A.N.Oznobishin,Y.S.Jeong 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
This paper describes results of application of an object oriented method of simulation to the process of obtaining optimum parameters of diesel fuel injection systems, Numerical cod [NJCALC has been developed considering for the first time the optimization of effects of propagation phenomena of pressure waves inside the branches of fuel injection systems, Simulation results trom numerical experiment demonstrate the high sensitivity of the injection system characteristics with variation of holes now discharge coefficients, the influence of pressure throbbing and the cumulative inertia mass flow which can not be neglected because it is strictly related on physical cause both to the beginning/end time of the injection and to the shape of injection rate.<br/>
Hardware Failure in Spinal Tumor Surgery: A Hallmark of Longer Survival?
Nikita Zaborovskii,Adam Schlauch,Dmitrii Ptashnikov,Dmitrii Mikaylov,Sergei Masevnin,Oleg Smekalenkov,John Shapton,Dimitriy Kondrashov 대한척추신경외과학회 2022 Neurospine Vol.19 No.1
Objective: Instrumentation failure in spine tumor surgery is a common reason for revision operation. Increases in patient survival demand a better understanding of the hardware longevity. The study objective was to investigate risk factors for instrumentation failure requiring revision surgery in patients with spinal tumors. Methods: A retrospective cohort from a single tertiary care specialty hospital from January 2005 to January 2021, for patients with spinal primary or metastatic tumors who underwent surgical intervention with instrumentation. Demographic and treatment data were collected and analyzed. Kaplan-Meier analysis was performed for overall survival, and separate univariate and multivariate regression analysis was performed. Results: Three hundred fifty-one patients underwent surgical intervention for spinal tumor, of which 23 experienced instrumentation failure requiring revision surgery (6.6%). Multivariate regression analysis identified pelvic fixation (odds ratio [OR], 10.9), spinal metastasis invasiveness index (OR, 1.11), and survival of greater than 5 years (OR, 3.6) as significant risk factors for hardware failure. One- and 5-year survival rates were 57% and 8%, respectively. Conclusion: Instrumentation failure after spinal tumor surgery is a common reason for revision surgery. Our study suggests that the use of pelvic fixation, invasiveness of the surgery, and survival greater than 5 years are independent risk factors for instrumentation failure.