Search

Copyright of Medicina (Buenos Aires) is the property of Medicina (Buenos Aires) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Paulista de Pediatria is the property of Assocoacao de Pediatria de Sao Paulo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Closed-form exact solutions for the periodic motion of the one-dimensional, undamped, quintic oscillator are derived from the first integral of the nonlinear differential equation which governs the behaviour of this oscillator. Two parameters characterize this oscillator: one is the coefficient of the linear term and the other is the coefficient of the quintic term. Not only the common case in which both coefficients are positive but also all possible combinations of positive and negative values of these coefficients which provide periodic motions are considered. The set of possible combinations of signs of these coefficients provides four different cases but only three different pairs of period-solution. The periods are given in terms of the complete elliptic integral of the first kind and the solutions involve Jacobi elliptic function. Some particular cases obtained varying the parameters that characterize this oscillator are presented and discussed. The behaviour of the periods as a function of the initial amplitude is analysed and the exact solutions for several values of the parameters involved are plotted. An interesting feature is that oscillatory motions around the equilibrium point that is not at x=0 are also considered. [ABSTRACT FROM AUTHOR]

Copyright of Medicina (Buenos Aires) is the property of Medicina (Buenos Aires) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Abstract: The first-order harmonic balance method via the first Fourier coefficient is used to construct two approximate frequency–amplitude relations for the relativistic oscillator for which the nonlinearity (anharmonicity) is a relativistic effect due to the time line dilation along the world line. Making a change of variable, a new nonlinear differential equation is obtained and two procedures are used to approximately solve this differential equation. In the first the differential equation is rewritten in a form that does not contain a square-root expression, while in the second the differential equation is solved directly. The approximate frequency obtained using the second procedure is more accurate than the frequency obtained with the first due to the fact that, in the second procedure, application of the harmonic balance method produces an infinite set of harmonics, while in the first procedure only two harmonics are produced. Both approximate frequencies are valid for the complete range of oscillation amplitudes, and excellent agreement of the approximate frequencies with the exact one are demonstrated and discussed. The discrepancy between the first-order approximate frequency obtained by means of the second procedure and the exact frequency never exceeds 1.6%. We also obtained the approximate frequency by applying the second-order harmonic balance method and in this case the relative error is as low 0.31% for all the range of values of amplitude of oscillation A. [Copyright &y& Elsevier]

Very early onset inflammatory bowel disease (VEOIBD) is a rare entity in pediatrics. Its association with primary immunodeficiencies of monogenic origin is known. We present the case of a patient diagnosed with VEOIBD who underwent massive paralleled exome sequencing. The result of the study showed a pathogenic variant in the RET proto-oncogene, associated with multiple endocrine neoplasia type 2A disease. There are no previous reports of association of RET proto-oncogene variants with VEOIBD. The presence of these two clinical entities cannot be attributed to a single genetic cause.

Objective: To determine the performance of groups of pediatric residents from a Buenos Aires hospital, in terms of correct recognition and communication of a medical error (ME), in a high-fidelity simulation scenario. To describe the reactions and communication attempts following the ME and the self-perception by the trainees before and after a debriefing., Methods: Quasi-experimental uncontrolled study conducted in a simulation center. First- and third-year pediatric residents participated. We designed a simulation case in which an ME occurred and the patient deteriorated. During the simulation, participants had to provide information on communicating the ME to the patient's father. We assessed communication performance and, additionally, participants completed a self-perception survey about ME management before and after a debriefing., Results: Eleven groups of residents participated. Ten (90.9%) identified the ME correctly, but only 27.3% (n=3) of them reported that a ME had occurred. None of the groups told the father they were going to give him important news concerning his son's health. All 18 residents who actively participated in this communication completed the self-perception survey, with an average score before and after debriefing of 5.00 and 5.05 (out of 10) (p=0.88)., Conclusions: We observed a high number of groups that recognized the presence of a ME, but the communication action was substantially low. Communication skills were insufficient and residents' self-perception of error management was regular and not modified by the debriefing.

Introduction: The approach to pediatric emergencies requires specialized resources, and medication errors are common., Objectives: To describe the contents of emergency trolleys (ETs) in a children's hospital and compare them after an educational intervention., Methods: The ETs from 9 hospitalization wards were included. A checklist of 30 drugs was developed. ETs were assessed by determining whether drugs were present or absent and their amount. An educational intervention was conducted and assessments were repeated 30 and 90 days after the intervention., Results: The baseline measurement indicated an overall ratio of adequate drugs of 43.9 % (95 % confidence interval [Cl]: 38.4-49.4) with a variation among ETs from 29 % to 54.8 %, and from 15 % to 85 % among drug groups. At 30 days, the adequate ratio reached 70.3 % (95 % CI: 65.275.4), with a wide variation among the different ETs and drug groups (from 51.6 % to 93.5 % and from 50 % to 95 %, respectively). At 90 days, the percentages were similar. The comparison between the first and second measurement showed an improvement in all ETs (range: 3.2 %-45.1 %), odds ratio: 3.73 (95 % CI: 2.5-5.6), p < 0.001. Results were similar between the second and third measurement., Conclusions: The baseline measurement showed a low level of adequate ET drugs. After the intervention, this improved significantly and was maintained during the studied period., Competing Interests: None, (Sociedad Argentina de Pediatría.)

Introduction: The Mini-Clinical Evaluation Exercise (Mini-CEX) is a formative tool with two descriptors assessing the inquiry of vaccination status and the hierarchy of prevention opportunities. Objectives. Determine the prevalence of both items in pediatric controls and spontaneous demands. Compare the performance between first and third year of their training., Material and Methods: Retrospective analysis based on trainees Mini-CEX charts., Results: There were 119 residents evaluated during their first year. The prevalence of vaccination status screening in controls was 94.9% (confidence interval -CI-: 91.09-98.91); in demands 73.1% (CI: 65.2-81; OR 5.33; CI: 2.23- 12.75; p 0.00004). The prevalence of prevention opportunities in controls was 69.8% (CI: 61.6- 78); in demands 62.2% (CI: 53.5-70.9; OR 1.034; CI: 0.4638-2.306; p= 0.4673). There were 32 trainees compared between their first and third year performance in demands, without significant difference., Conclusions: We found high prevalence of vaccination inquiry and lower prevalence of hierarchization of prevention opportunities in controls, with less inquiry in demands., (Sociedad Argentina de Pediatría.)

Saint Louis encephalitis is transmitted by Culex mosquitoes. In Argentina sporadic cases are registered. Symptomatic illness is unusual in children. We present a case of meningoencephalitis caused by an uncommon viral infection. The clinical signs and symptoms are unusual for pediatric patients and the bilateral thalamic compromise showed on magnetic resonance has not been described previously. An 8-year-old girl consulted due to fever, behavior disorders and ataxia. Clonus and neck stiffness were detected at physical exam. Cerebrospinal fluid revealed mononuclear leukocytosis; bilateral ischemic compromise was observed in thalamus by magnetic resonance. Saint Louis virus was confirmed by serology: serum and cerebrospinal fluid IgM were positive during the acute phase of the disease and serum IgG was positive four weeks later. Most of the signs and symptoms of the disease were resolved, however mild behavior disorders were observed as acute sequelae up to 45 days after hospital discharge., (Sociedad Argentina de Pediatría.)

Unlabelled: The Mini Clinical Evaluation Exercise (Mini-CEX) is an assessment tool, which emphasizes the educational value and is based on direct performance observation. The objective was to evaluate the reliability and feasibility of Mini-CEX using pediatric descriptors during its implementation in two pediatric residency programs. The design was observational, exploratory and feasibility in the use of this evaluation tool. Based on the original format, descriptors related to the pediatric consult for each Mini-CEX dimension's were agreed. Operators were trained in the use of this tool by means of descriptors as well as in debriefing strategies. Finally, there were two simultaneous and independent evaluations for each observation., Analysis: a) Mini-CEX global and dimension score; b) Concordance between operators scores (mean differences and 95% CI); c) Non evaluable descriptors frequency; d) Duration and satisfaction in use. There were 80 observations in 40 pediatric consults. Overall score 7.5±0.9 (6.4±2 to 8.3±1.1 depending on dimension), with no significant differences between the two institutions. There was high agreement between observers (Mean, difference between 0.1 and 0.3, 95% CI -0.8 to 0.3). The frequency of non evaluable descriptors ranged 5-28 (9% to 51%) and it was not associated with the implementation stage. The average implementation time was 20 minutes, and satisfaction in use was high among both operators and residents. Mini-CEX tool using pediatric descriptors showed high reliability. The joint experience was satisfactory and simultaneously confirmed the value of debriefing.