Reconstrucción mamaria inmediata con expansores tisulares / Immediate breast reconstruction with tissue expanders

RESUMEN Introducción: La reconstrucción mamaria postmastectomía es la forma habitual en nuestro país. En el Instituto de Oncología se realizan en la actualidad con sistematicidad de manera inmediata para disminuir el impacto psicológico de la mastectomía. Objetivo: Evaluar el comportamiento de la reconstrucción mamaria inmediata con el uso de expansores tisulares. Métodos: Se realizó un estudio observacional, descriptivo, retrospectivo y longitudinal, en pacientes ingresadas en el Instituto Nacional de Oncología y Radiología con criterios de reconstrucción mamaria inmediata con expansores tisulares, en el periodo comprendido entre octubre de 2015 a diciembre de 2018. El universo estuvo conformado por 51 paciente siendo la muestra 43. Resultados: Predominó la reconstrucción en mujeres entre 40 y 49 de color de la piel blanca. La mayoría con hábitos tóxicos de fumadoras. Se realizó como técnica quirúrgica la reconstrucción inmediata con expansión tisular, fue el más utilizado el anatómico. Las principales complicaciones estuvieron relacionadas con la radioterapia y hábitos tóxicos. Conclusiones: Todas las mujeres se reconstruyeron con expansor tisular, de forma inmediata, con bajo índice de complicaciones(AU)

ABSTRACT Introduction: Postmastectomy breast reconstruction is the usual way in our country. At the Oncology Institute they are currently performed systematically immediately to lessen the psychological impact of mastectomy. Objective: To evaluate the behavior of immediate breast reconstruction with the use of tissue expanders. Methods: An observational, descriptive, retrospective and longitudinal study was carried out in patients admitted to the National Institute of Oncology and Radiology with criteria for immediate breast reconstruction with tissue expanders, in the period from October 2015 to December 2018. The universe it was made up of 51 patients, sample 43. Results: Reconstruction predominated in women between 40 and 49 of white skin color. Most with toxic smoking habits. Immediate reconstruction with tissue expansion was performed as a surgical technique, anatomical was the most used. The main complications were related to radiation therapy and toxic habits. Conclusions: All the women were reconstructed with a tissue expander, immediately, with a low rate of complications(AU)

Reconstrução mamária em dois estágios com expansores de tecido e implantes de silicone / Breast reconstruction in two stages with tissue expanders and silicone breast implants

Introdução: A reconstrução mamária imediata com expansor/ implante permanece uma opção importante para mulheres submetidas à mastectomia. O objetivo desse estudo foi avaliar os resultados de reconstrução mamária imediata com emprego expansores e implantes em pacientes submetidas à radioterapia e não submetidas à radioterapia no pós-operatório. Métodos: Foi realizado estudo prospectivo consecutivo com 83 mulheres submetidas à reconstrução mamária imediata com expansores seguido de implantes no período de 2007 a 2012, totalizando 90 reconstruções. No primeiro tempo cirúrgico, o expansor foi colocado em uma bolsa submuscular sob os músculos peitoral maior e serrátil. No segundo tempo, o expansor foi substituído pela prótese. Dois grupos de pacientes foram comparados: (1) pacientes que receberam radioterapia no pós-operatório e (2) pacientes que não receberam radioterapia no pós-operatório. Os resultados foram avaliados em cada grupo nos dois tempos cirúrgicos. Resultados: Trinta e três pacientes receberam tratamento radioterápico (39,8%) no final da expansão. Observamos a ocorrência de 13,25% de complicações no primeiro tempo: deslocamento do expansor (4,8%), esvaziamento (2,4%), infecção (2,4%), deiscência de pele (2,4%) e extrusão (1,2%). No segundo tempo, as complicações foram 17,6%: contratura capsular (7%), extrusão (5,3%), e infecção (5,3%). Com relação aos grupos estudados no primeiro tempo, aqueles que fizeram radioterapia tiveram (18,18%) de complicações e o grupo não exposto à radioterapia apenas (10,0%). No segundo tempo, encontramos 7 (46,6%) complicações para radioterapia e apenas 3 (7,14%) para o grupo não irradiado. Conclusões: Pacientes que receberam radioterapia posteriormente à reconstrução apresentaram maiores índices de complicações.

Introduction: Immediate breast reconstruction with an expander/implant is a good option for women submitted to mastectomy. This study aimed to evaluate the results of immediate breast reconstruction with implants and expanders in patients who did or did not undergo postoperative radiotherapy. Methods: A consecutive prospective study that involved 83 women submitted to immediate breast reconstruction, was carried out by first performing breast reconstruction surgery with expanders and then with implants. The study was conducted between 2007 and 2012 and accounted for a total of 90 reconstructions. In the first surgery, an expander was placed in a submuscular bag under the pectoralis major and serratus muscles. In the second surgery, the expander was replaced by an implant. We compared the surgical outcomes of both types of surgeries (with implants and with expanders) in patients who underwent postoperative radiotherapy and those who did not. Results: After the first surgery, 33 patients (39.8%) received radiotherapy, and 13.25% experienced complications, including expander displacement (4.8%), emptying (2.4%), infection (2.4%), skin dehiscence (2.4%), and extrusion (1.2%). After the second surgery, 17.6% of the subjects experienced complications, including capsular contracture (7%), extrusion (5.3%), and infection (5.3%). With regard to the first surgery, 18.8% of the patients who underwent radiotherapy and 10.0% of those who did not, experienced complications. With regard to the second surgery, these prevalences were 46.6 % and 7.14%, respectively. Conclusion: Patients who received radiotherapy after breast reconstruction surgery experienced more complications.

Difusión de cotrimoxazol a través de un expansor tisular: Estudio in vitro / Cotrimoxazole diffusion through a tissue expanders: In vitro study

Introducción: La principal complicación del uso de los expansores titulares (ET) son las infecciones. Una alternativa para evitarla, es agregar antibióticos que se difundan a través de la pared de un ET y eviten la colonización bacteriana. El objetivo de este trabajo fue evaluar la eficacia de una presentación nacional de cotrimoxazol, para difundirse a través de un ET en diferentes volúmenes de expansión. Material y método: Se realizó un experimento longitudinal con 12 ET, llenados a 50,100, 150 o 200% de su capacidad nominal, con solución fisiológica y cotrimoxazol a una concentración de 800/4000 ug/mL de trimetoprin/sulfametoxazol (TMX/SMX), sumergidos posteriormente en un sistema cerrado. Se midió la presión en el interior del ET, al inicio y al final del experimento. En los cuatro grupos se cuantificó la concentración de cotrimoxazol en la solución del contenedor, durante nueve días consecutivos. Los resultados se compararon mediante ANOVA de dos vías. Resultados: El SMX se precipitó dentro del ET. Las concentraciones de TMX en la solución del contenedor fueron diferentes en función del tiempo y el porcentaje de expansión. No hubo correlación entre el porcentaje de expansión y la presión dentro del ET. Conclusiones: La sinergia de cotrimoxazol de uso endovenoso disponible en nuestro país, no es una buena opción a emplearse en un ET a las dosis utilizadas, ya que el coeficiente de solubilidad de SMX se saturó y se formaron cristales. El incremento de difusión de TMX estuvo asociado con un mayor porcentaje de expansión, lo que es una ventaja, considerando que las infecciones son más frecuentes al final del proceso de expansión.

Introduction: Infection associated with tissue expansion is one of the main complications and force to take away the tissue expander. An alternative to avoid this action is to dilute antibiotics inside it. The aim of this experiment was to quantify the concentration of cotrimoxazole diffused through a tissue expander at different expansion and pressure volumes. Material and methods: A test was performed with 12 tissue expanders immersed in a closed system. These were divided in 4 sets according to the introduced expansion rate. Three independent variables were considered: percentage of lumen volume introduced into the expander, pressure inside the expander, and experiment duration. The concentration of the drug diffused through the expander was taken as dependent variable. The solution in which the expander was immersed was continuously sampled and drug concentration was determined by High Performance Liquid Chromatography (HPLC). ANOVA was used to determine differences between concentrations measured of every variable applied. Results: Only trimethoprim (TMX) diffused. No lineal correlation was observed between expansion rate and pressure inside the expander. The difference with respect to time and concentration of the drug outside the expander was statistically significant among the 4 sets of expanders (p = 0.0000). Conclusion: Sulfametoxazole (SMX) did not diffuse and crystallized inside the expander because of the different pk of the two drugs (SMX-TMX) respect to pH of dilution which was similar to pK of trimethoprim. The expansion rate had a proportional effect on TMX concentration outside the expander: an over-expansion of the system greater than 200% increases diffusion highly.

Manual control for continuous and constant pressure skin expansion / 中华医学美学美容杂志

Objective To investigate a safe, highly efficient and rapid skin expansion method. Methods Syringe pump and pump control of automatic (PCA) replacemented normal affusion were used with shorter and vertical skin professional jargon for continuous and constant pressure skin expansion. Twenty cases (23 expanders) were carried out in this way. Results The maximum area of defect was 16 cm?20 cm, and the minimum area of defect was 3 cm?3 cm. The expanders were used for 18 days and the volume of expanders were 40-900 ml . It was more rapidly than normal affusion. There were no more complications except a case of expander leakage, and others expressed their satifactions Conclusion This modification of the skin expansion is a safe, comfortable, convenient to carry with. It is worth recommendation.