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Safety of Percutaneous Endoscopic Gastrostomy Tubes in Centenarian Patients
Zain A Sobani,Kevin Tin,Steven Guttmann,Anna A Abbasi,Ira Mayer,Yuriy Tsirlin 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.1
Background/Aims: Percutaneous endoscopic gastrostomy (PEG) is a relatively safe procedure; however, no study has evaluated thesafety of PEG tube placement in patients over the age of 100 years. Methods: We conducted a retrospective review of patient records for patients who underwent PEG tube placement. Thirty patientsaged 100 years and older were identified and a random sample of 275 patients was selected for comparison. Results: The mean age of the patients was 80.6±16.2 years. No procedure-related deaths or major complications were identified; theoverall inpatient mortality rate was 7.6%. Minor complications were noted in 4% (n=12) of the patients. Centenarian patients werepredominantly female (80% [n=24] vs. 54% [n=147], p=0.006), with a mean age of 100.5±0.9 years. There was no significant differencein procedural success rates (93.3% vs. 97.4%, p=0.222) or inpatient mortality (6.7% [n=2] vs. 7.7% [n=21], p=1.000) between the twogroups. However, a higher minor complication rate was noted in the older patients (13.3% [n=4] vs. 2.9% [n=8], p=0.022). Conclusions: Success rates, major complications and inpatient mortality associated with PEG tubes in patients aged over 100 yearsare comparable to those observed in relatively younger patients at our center; however minor complication rates are relatively higher. These findings lead us to believe that PEG tubes may be safely attempted in carefully selected patients in this subset of the population.
Fault Tolerant Operation of the Modular High Frequency Converter
A. Mayer,M. Schulz,C. Rolff,R. Marquardt 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Fault tolerance of converters and drive systems is becoming a key issue for many future applications. The Modular High Frequency Converter (MHF) is a new inverter topology, especially designed for applications, where high reliability and ultra-light weight are important. Besides superior dynamic behavior, continuous operation after defects is one of the main advantages of the Modular High Frequency Converter. Considering fault tolerant operation, different failure scenarios and possible countermeasures are analyzed in this paper. A new control concept, supporting the capability of fault tolerant operation is introduced. Simulation and operating results of the first laboratory prototype prove the fault ride through capability of the presented topology.
Measurements and Evaluation of Differential Cross-sections for In Beam Analysis
A. F. Gurbich,D. Abriola,N. P. Barradas,A. R. Ramos,I. Bogdanovic-Radovic,M. Chiari,C. Jeynes,M. Kokkoris,M. Mayer,L. Shi,I. Vickridge 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Ion beam analysis (IBA) methods always rely on available differential cross section data to obtain quantitative results about composition and structure of the near-surface layer of a sample. In order to meet the nuclear data needs of the IBA community, the Coordinated Research Project (CRP) ``Development of a Reference Database for Ion Beam Analysis'' was initiated by the IAEA in 2005 and will be concluded in 2010. A summary of the results of this IAEA Coordinated Research Project activity is presented, problems still existing in the field are discussed, and ways to further develop nuclear data for IBA are indicated.
Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS
Mayer, M.,Kuhn, S. E.,Adhikari, K. P.,Akbar, Z.,Anefalos Pereira, S.,Asryan, G.,Avakian, H.,Badui, R. A.,Ball, J.,Baltzell, N. A.,Battaglieri, M.,Bedlinskiy, I.,Biselli, A. S.,Boiarinov, S.,Bosted, P. American Physical Society 2017 Physical Review C Vol.95 No.2
<P>Conclusions: Final-state interactions seem to play a lesser role for polarization observables in deuteron two-body electrodisintegration than for absolute cross sections. Our data, while limited in statistical power, indicate that PWIA models work reasonably well to understand the asymmetries at lower missing momenta. In turn, this information can be used to extract the product of beam and target polarization (PbPt) from quasielastic electron-deuteron scattering, which is useful for measurements of spin observables in electron-neutron inelastic scattering. However, at the highest missing (neutron) momenta, FSI effects become important and must be accounted for.</P>
Endoscopic Retrograde Cholangiopancreatography in Nonagenarian Patients: Is It Really Safe?
Zain A Sobani,Daria Yunina,Anna Abbasi,Kevin Tin,Daniel Simkin,Mary Rojas,Yuriy Tsirlin,Ira Mayer,Rabin Rahmani 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.4
Background/Aims: Literature on the safety of endoscopic retrograde cholangiopancreatography (ERCP) in elderly patients is divided. Based on this we decided to examine the safety of ERCP in nonagenarian patients. Methods: A total of 1,389 patients, with a mean age of 63.94±19.62 years, underwent ERCP during the study period. There were74 patients aged 90 years or older with a mean age of 92.07±1.8. Logistic regression showed that nonagenarian patients had asignificantly increased odds of in-patient mortality (adjusted odds ratio [AOR]=9.6; 95% confidence interval [CI]=4, 23; p≤0.001). Charlson Comorbidity Index (CCI) ≥2 was also an independent predictor of in-patient mortality (AOR=2.4; 95% CI=1.2, 5.2;p=0.021). Age ≥90 was not associated with increased adverse events; however emergency procedures (AOR=2.4; 95% CI=1.5, 4;p<0.001) and CCI ≥2 (AOR=2.6; 95% CI=1.7, 4.0; p<0.001) were more likely to have adverse events. Conclusions: Age ≥90 and CCI ≥2 are independently associated with increased odds of in-patient mortality in patients undergoingERCP, whereas emergency procedures and CCI ≥2 are associated with an increased adverse event rate. Caution must be exercised whenconsidering ERCP in patients aged ≥90 years and those with a CCI ≥2.
Wave attenuation in microcrystal copper at irradiation by a powerful electron beam
E.N. Borodin,A.E. Mayer,V.S. Krasnikov 한국물리학회 2011 Current Applied Physics Vol.11 No.6
The numerical study of high-rate plasticity of Cu target with different grain sizes under the action of nanosecond relativistic high-current electron beam has been carried out in the paper. The model of microcrystal material plasticity includes dislocation kinetics and dynamics as well as the stress relief in the grain boundaries of the polycrystal. This model has only two adjustable parameters. The presented results demonstrate a strong dependence of the shock wave attenuation coefficient on the grain size. At the grain size of about 70 nm, the plasticity mechanism of the dislocation glide inside grains changes to plasticity mechanism along grain boundaries.