Reparación del músculo pronador cuadrado en fracturas de radio distal tratadas con fijación interna por abordaje palmar: una revisión sistemática y metaanálisis / Repair of the pronator quadratus muscle in distal radius fractures treated with internal fixation through a palmar approach: a systematic review and meta-analysis

Introducción: el músculo pronador cuadrado funciona como un estabilizador dinámico de la articulación radiocubital distal. Su reparación posterior a la fijación interna con placa de bloqueo volar en fracturas distales del radio es controvertida. Objetivo: determinar si la reparación del músculo pronador cuadrado influye en los resultados clínicos y funcionales de pacientes con fractura de radio distal que se sometieron a reducción abierta y fijación interna con placa de bloqueo volar. Materiales y métodos: se realizó una revisión sistemática y metanálisis. Las bases de datos analizadas fueron PubMed/Medline, Embase y Bireme/Lilacs (búsqueda realizada hasta el 20 de febrero del año 2023). Los términos de búsqueda fueron: distal radius fracture AND volar plate AND pronator quadratus. Se determinó la calidad metodológica según el manual de revisiones Cochrane. Resultados: en total se incluyeron 4 ensayos clínicos aleatorizados de adecuada calidad metodológica, lo cual corresponde al análisis de 213 participantes. Existen mejores resultados en la puntuación DASH a los 12 meses de seguimiento en el grupo de no reparación del músculo pronador cuadrado DM 2,8 [IC 95%: 0,51;5,10]. No hubo diferencias significativas al año de seguimiento en las puntuaciones de dolor, rangos de movilidad de la muñeca, fuerza de agarre e incidencia de complicaciones. Conclusión: no existe evidencia que sustente la reparación rutinaria del músculo pronador cuadrado posterior a la fijación interna con placa de bloqueo volar en las fracturas de radio distal. (AU)

Introduction: the pronator quadratus muscle functions as a dynamic stabilizer of the distal radioulnar joint, and its repair after internal fixation with volar locking plate in distal radius fractures is controversial. Objective: to determine whether the repair of the pronator quadratus muscle influences the clinical and functional outcomes of patients with distal radius fracture who underwent open reduction and internal fixation with volar locking plate. Materials and methods: a systematic review and meta-analysis were conducted. The analyzed databases were Pubmed/Medline, Embase, and Bireme/Lilacs (search performed until February 20th, 2023). The search terms were distal radius fracture AND volar plate AND pronator quadratus. Methodological quality was determined according to the Cochrane Reviewer's Handbook. Results: a total of 4 randomized clinical trials of adequate methodological quality, corresponding to the analysis of 213 participants, were included. Better DASH scores were observed at 12 months of follow-up in the non-repair group of the pronator quadratus muscle, with a mean difference of 2.8 [95% CI 0.51; 5.10]. There were no significant differences at one-year follow-up in pain scores, wrist mobility ranges, grip strength, and incidence of complications. Conclusion: there is no evidence to support routine repair of the pronator quadratus muscle after internal fixation with volar locking plate in distal radius fractures. (AU)

Evaluation of the Uncertainty in Satellite-Based Crop State Variable Retrievals Due to Site and Growth Stage Specific Factors and Their Potential in Coupling with Crop Growth Models.

Coupling crop growth models and remote sensing provides the potential to improve our understanding of the genotype x environment x management (G × E × M) variability of crop growth on a global scale. Unfortunately, the uncertainty in the relationship between the satellite measurements and the crop state variables across different sites and growth stages makes it difficult to perform the coupling. In this study, we evaluate the effects of this uncertainty with MODIS data at the Mead, Nebraska Ameriflux sites (US-Ne1, US-Ne2, and US-Ne3) and accurate, collocated Hybrid-Maize (HM) simulations of leaf area index (LAI) and canopy light use efficiency (LUECanopy). The simulations are used to both explore the sensitivity of the satellite-estimated genotype × management (G × M) parameters to the satellite retrieval regression coefficients and to quantify the amount of uncertainty attributable to site and growth stage specific factors. Additional ground-truth datasets of LAI and LUECanopy are used to validate the analysis. The results show that uncertainty in the LAI/satellite measurement regression coefficients lead to large uncertainty in the G × M parameters retrievable from satellites. In addition to traditional leave-one-site-out regression analysis, the regression coefficient uncertainty is assessed by evaluating the retrieval performance of the temporal change in LAI and LUECanopy. The weekly change in LAI is shown to be retrievable with a correlation coefficient absolute value (|r|) of 0.70 and root-mean square error (RMSE) value of 0.4, which is significantly better than the performance expected if the uncertainty was caused by random error rather than secondary effects caused by site and growth stage specific factors (an expected |r| value of 0.36 and RMSE value of 1.46 assuming random error). As a result, this study highlights the importance of accounting for site and growth stage specific factors in remote sensing retrievals for future work developing methods coupling remote sensing with crop growth models.

Reconstrucción de la pared abdominal mediante la técnica de separación de componentes / Component separation technique for the repair of abdominal wall defects

Antecedentes: La reconstrucción de la pared abdominal tiene como fin restaurar el soporte estructural, otorgando una cobertura estable y optimizando la apariencia estética. La técnica de separación de componentes consiste en el avance medial de un componente muscular y fascial inervados, para reconstruir defectos en la línea media, logra un cierre sin tensión y ayuda a recrear la dinámica de la pared abdominal. Objetivo: El objetivo del siguiente trabajo es presentar la experiencia del Hospital de Carabineros en la reconstrucción de tales defectos utilizando esta técnica y evaluar la tasa de recidiva. Material y método: Estudio retrospectivo de pacientes operados en el Hospital entre 2010 y 2015. Se describe la técnica quirúrgica utilizada.Resultados: Se presenta una serie de 6 pacientes operados en dicho período. El tamaño promedio del defecto fue 272,8 cm². Se utilizó la técnica clásica de separación de componentes y en algunos casos modificaciones para preservar perforantes. La cirugía tuvo una duración de 185 min en promedio. No se han presentado recidivas a la fecha entre los pacientes operados (seguimiento promedio 16,8 meses). Conclusiones: La técnica de separación de componentes repara defectos extensos de manera anatómica, autógena y devolviendo la funcionalidad a la pared abdominal. Es un procedimiento que no está libre de complicaciones, sin embargo, en nuestra experiencia los resultados son estables en el tiempo sin evidenciar recidivas. Se recomienda una adecuada evaluación y selección de cada caso.

Background: The component separation technique is a type of rectus abdominis muscle advancement flap that allows reconstruction of such large ventral defects. The advantages of the component separation technique are that it restores functional and structural integrity of the abdominal wall, provides stable soft tissue coverage, and optimizes aesthetic appearance. Aim: To report our experience in abdominal reconstruction using this technique. Material and methods: Review of medical records of 6 patients subjected to an abdominal wall repair using the component separation technique. Results: The mean size of the abdominal wall defect was 272.8 cm². The classic technique or a modification to preserve perforator vessels were used. The mean surgical time was 185 minutes. After a follow up of 16.8 months, no relapses were observed. Conclusions: In this experience the component separation technique had good results and no relapse of the defect was observed.

Umbilical reinsertion in abdominoplasty: technique using deepithelialized skin flaps.

One goal of abdominoplasty is to reestablish a natural-appearing umbilicus with hidden scars. The authors present a new technique for navel reinsertion.

A prospective, randomized, double-blind, controlled clinical trial comparing laser-assisted lipoplasty with suction-assisted lipoplasty.

BACKGROUND: The authors randomized and prospectively analyzed their clinical experience with the use of internal neodymium:yttrium-aluminum-garnet low-level laser-assisted lipoplasty compared with suction-assisted lipoplasty. METHODS: Suction-assisted lipoplasty was generated through a SmartLipo machine and delivered into the subcutaneous tissues through 2-mm solid optical probes. Ipsilateral suction-assisted lipoplasty and contralateral laser-assisted lipoplasty were performed on one or more comparable topographic areas of the body in the same patient. Laser-assisted lipoplasty and suction-assisted lipoplasty sides of 25 patients were compared with preoperative and postoperative photographs at 3 to 5 days, 12 to 15 days, and 6 to 11 months. Statistical analysis considered surgeon and patient satisfaction, time used in the procedures, learning curves, lipocrits, operative technique, postoperative pain, edema, ecchymosis, time of recovery, body mass index, DNA proteins, free fatty acids, and cytologic patterns of post-laser-assisted lipoplasty and suction-assisted lipoplasty adipocyte architecture. Photographs were sent to the patients (blinded to the operated sides) and two plastic surgeons unfamiliar with the cases for evaluation of results. RESULTS: All patients completed the preestablished follow-ups. No complications were observed. Less pain, lower lipocrits, higher triglycerides, and DNA cellular membrane traces were detected in the laser-assisted lipoplasty sides. All other considerations studied showed no differences with either technique in the three periods of the follow-up controls. Cytologic studies showed more damage of the adipocytes in the laser-assisted lipoplasty sides. CONCLUSIONS: No major clinical differences for suction-assisted lipoplasty versus laser-assisted lipoplasty were found. Higher concentrations of free-fatty acids after laser-assisted lipoplasty must alert us to possible hepatic and renal toxicity.

Nonresective shrinkage of the septum and fat compartments of the upper and lower eyelids: a comparative study with carbon dioxide laser and Colorado needle.

BACKGROUND: The purpose of this article is to describe an alternative nonresective treatment of the fat-septum component of the eyelids during blepharoplasty, using shrinkage desiccation with two low-energy modalities: a carbon dioxide laser and a low-range grid of electrocautery with a Colorado microdissection needle. METHODS: Thirty-six patients underwent a four-lid blepharoplasty. During surgery, after exposure (not opening) of the septum and assessment of the amount of bulging by gentle globe compression, a grid spray of electrocautery (right eye) and carbon dioxide laser (left eye) was applied over the entire septum until shrinkage and correction of the bulging was achieved. Preoperative, postoperative day 15, and 1-year follow-up photographs were evaluated using an objective grading system by blinded surgeons. For statistical analysis, the Wilcoxon matched-pairs signed-ranks test was used, with p < 0.05 indicating statistical significance. RESULTS: All the patients completed the 15-day evaluation, but only 32 completed the 1-year follow-up. No major eye or eyelids complications were observed. There were no statistical differences in surgical time and postoperative pain on either side. In this study, laser fat-septum shrinkage achieved substandard results compared with electrocautery when analyzed as a continuous variable, but it did not influence the categorical Strasser scale final result in the short- and long-term follow-up. CONCLUSIONS: The method described is simple and safe, and provides a subtle but long-lasting, adequate result. No statistical clinical differences were observed between the electrocautery and laser fat-septum shrinkage techniques.

A clinical retrospective study comparing two short-scar face lifts: minimal access cranial suspension versus lateral SMASectomy.

BACKGROUND: The purpose of this study was to retrospectively compare the short- and long-term cosmetic outcomes of two minimal incision rhytidectomies and analyze their advantages and disadvantages. METHODS: The results of minimal access cranial suspension face lift versus minimal incision rhytidectomy with lateral SMASectomy were evaluated after 1 and 24 months. Statistical analysis considered surgeon/patient satisfaction, time used in the procedures, pain, and learning curves. Photographs were sent to the patients and two plastic surgeons, unfamiliar with the cases, for evaluation of results that were assessed by an objective grading system described by Strasser. RESULTS: Eighty-two patients completed 1 and 24 months' follow-up. Complications were two hematomas, two retroauricular-lobule dog-ears, and one hypertrophic preauricular scar. Surgical time was longer for the SMASectomy. Postoperative pain was worse for minimal access cranial suspension face lift. There were no differences in cosmetic results between the two techniques at 1-month and 2-year follow-up. Incorporating age, sex, postoperative pain, and duration of surgery as confounding factors did not modify the model. Surgeon/patient satisfaction showed no difference with either technique, but the photographic evaluation of all cases at 24 months revealed that more than 50 percent of the sample needed a tuck procedure to correct jowling and redundant skin. CONCLUSIONS: Advantages of short-scar face lifts are the avoidance of the postauricular and occipital incisions, and the disadvantages are the moderate results in the neck and nasolabial folds and their potential short duration. For 24 months in this study, the duration of results was similar for both minimal access cranial suspension and lateral SMASectomy.

Minimal surgical access to treat gynecomastia with the use of a power-assisted arthroscopic-endoscopic cartilage shaver.

Gynecomastia is the most common benign condition of the male breast. The authors present a new method of treatment for gynecomastia that combines traditional liposuction in conjunction with a shaver technique to effectively remove the fibrofatty and the glandular tissues of the male breast and avoid areolar incisions. Twenty-five patients were treated in this fashion, and each patient demonstrated a smooth, masculine breast contour with well-concealed scars in the inframammary folds, eliminating the stigma of breast surgery. The procedure is technically straightforward and provides consistent results. It is offered as an additional option for the treatment of gynecomastia.

Nutrición enteral en pacientes con tumores de cabeza y cuello / Enteral nutrition in patients with head and neck tumors

La alimentación enteral, con un aporte promedio de 41,7 Kcal/kg y 1,5 g de proteínas por kilo, mantiene adecuadamente el estado nutricional de pacientes portadores de tumores de cabeza y cuello. La nutrición enteral que contiene fibra (38 g por día), aumenta significativamente la frecuencia y peso de las deposiciones y reduce la constipación en este tipo de pacientes. La nutrición enteral con fibra es una técnica sencilla, de bajo costo y debe considerarse de elección para tratar nutricionalmente a estos enfermos