RESUMO
A new proposed design of neutron shielding material-based on the commercial material Borotron UH050 with an addition of Al(OH)3-is evaluated in order to determine if its neutron and gamma shielding properties match those of a reference material, NS4FR. Neutron and gamma dosimetry measurements are performed, as well as neutron spectrometry measurements and Monte Carlo simulations. Negligible differences are found between the materials for neutron shielding, while significant differences are found for gamma shielding. The effect of Al(OH)3 addition to Borotron UH050 is to reduce neutron shielding properties while increasing gamma shielding properties. The resulting material is as efficient as NS4FR for neutron shielding but less efficient for gamma shielding-thicknesses 20% higher are required to match gamma shielding properties of NS4FR. Monte Carlo models of the materials are validated based on the performed measurements of neutron spectra and neutron and gamma ambient dose equivalent.
Assuntos
Raios gama , Nêutrons , Aceleradores de Partículas/instrumentação , Equipamentos de Proteção , Proteção Radiológica/instrumentação , Radiometria/métodos , Simulação por Computador , Humanos , Método de Monte Carlo , Doses de Radiação , Proteção Radiológica/métodos , Radiometria/instrumentaçãoRESUMO
We present our experience in the first 236 hysteroscopic procedures in Pontificia Universidad Católica of Chile. 219 were performed as part of infertility study and 17 were performed for other reasons. The surgical technique, type of anesthesia, distension procedures and complications are described. The correlation between hysterosalpingographic diagnosis and endoscopic vision is established. The preoperative diagnosis was confirmed in 82% of the uterine cavity synechiae, 72% of the cervical synechiae, 67% of polyps and/or myomas, and in 100% of uterine malformations. Myomas and/or polyps were found in 12% of normal appearing hysterosalpingograms.
Assuntos
Histeroscopia , Doenças Uterinas/diagnóstico , Adulto , Anestesia Geral , Feminino , Humanos , Histeroscópios , Histeroscopia/efeitos adversos , Histeroscopia/métodos , Pessoa de Meia-Idade , Doenças Uterinas/cirurgiaRESUMO
The hysteroscopic study and treatment of 136 infertile patients with synechiae of the uterine cavity and/or cervix is presented. The preoperative diagnosis was established by hysterosalpingography. The correlation between the diagnosis by hysterosalpingography and hysteroscopy was 72% for synechiae of the cervix; 73% for mild synechiae; 83.3% for moderate synechiae and 75% for severe synechiae of the uterine cavity. All findings of synechiae were treated hysteroscopically. The history of abortion and puerperal infection were among the most commonly found amnestic data related to the genesis of synechiae. The pregnancy rate was 70%, and 87.5% delivered term pregnancies in patients who did not have other associated factors of infertility.
Assuntos
Histeroscopia , Doenças Uterinas/diagnóstico , Anestesia Geral , Feminino , Humanos , Histerossalpingografia , Infertilidade Feminina/diagnóstico , Infertilidade Feminina/etiologia , Infertilidade Feminina/cirurgia , Aderências Teciduais/complicações , Aderências Teciduais/diagnóstico , Aderências Teciduais/cirurgia , Doenças Uterinas/complicações , Doenças Uterinas/cirurgiaAssuntos
Doenças Biliares/cirurgia , Complicações na Gravidez/cirurgia , Feminino , Humanos , GravidezRESUMO
Se estudia "prospectivamente" un grupo de 20 pacientes embarazadas, intervenidas por patologia aguda de la via biliar, entre octubre de 1980 y septiembre de 1981 en el Hospital Doctor Sotero del Rio. Los datos obtenidos nos permiten concluir: 1. La indicacion mas frecuente de cirugia no obstetrica durante el embarazo, en nuestro medio, es de causa biliar. 2. El cuadro biliar agudo se presenta con las mismas caracteristicas clinicas que en la no gravida. 3. No se encontraron caracteristicas que definan un grupo de alto riesgo para desarrollar patologia biliar aguda durante la gestacion. 4. La cirugia en la segunda mitad del embarazo y aquella que comprende drenaje de la via biliar, se asocian con alta morbilidad obstetrica y perinatal pese a lo cual no determino mortalidad perinatal en la serie