ABSTRACT
This study analyzes the effects of the Rapha® system, which employs red light therapy (RLT) and a natural latex biomembrane in the healing of neuropathic ulcers associated with the diabetic foot. We conducted a randomized, controlled, blinded clinical trial with 15 participants that were divided into three groups (GI, GII and GIII): (i) Rapha® system application by the participant and a health professional at home, with clinical status evaluation every 2 weeks at the hospital (GI); (ii) standard protocol used in Brazil, performed by a health professional at the hospital (GII; control); and (iii) the Rapha® system applied by the participant at home and clinical status evaluation every 2 weeks at the hospital (GIII). We used image processing techniques on photographic recordings of the lesions, and several statistical tests were used to analyze the data, allowing for the comparison of the average results for all groups. The average healing rates of GI, GII, and GIII were 77.0, 51.4, and 80%, respectively. The granulation tissue evaluation indicated a higher efficacy in the tissue repair of lesions treated with the Rapha® system. In conclusion, the Rapha® system proved to be an effective healing system, even when self-applied at the patient's home.
Subject(s)
Bandages , Diabetic Foot/therapy , Latex , Membranes, Artificial , Phototherapy , Wound Healing , Aged , Diabetic Foot/pathology , Diabetic Foot/physiopathology , Female , Humans , Male , Middle AgedABSTRACT
Radiofrequency ablation has become an accepted treatment option of patients with primary and metastatic liver tumors. We propose an ablation electrode array consisting of 4-8 blade shaped electrodes arranged in a circular geometry for the treatment of large liver tumors. We developed a 3D code based on the finite difference method for evaluating the effect of different numbers of electrodes (4, 6 and 8) and electrode distance on lesion size. The configuration with six electrodes can ablate a volume of 70 x 70 x 40 mm(3) in approximately 5 min, with tissue temperature above 50 degrees C throughout the treatment volume. We then performed an experimental study in polyacrylamide gel in order to validate the theoretical results. The average temperature error between the simulation and the experiment was 3.8% at the center of the electrode array. This study shows that the proposed device potentially allows more rapid treatment of large tumors than current radiofrequency ablation devices.
Subject(s)
Catheter Ablation/instrumentation , Liver Neoplasms/surgery , Animals , Cattle , Computer Simulation , Electric Conductivity , Electrodes , Numerical Analysis, Computer-Assisted , Temperature , Thermal Conductivity , Time FactorsABSTRACT
This article presents a framework that allows the automated gathering of medical evidence, using a methodology based on Bayesian Networks (BN). For such purpose, system software and a programming methodology were developed. The proposed methodology is generic and can be applied to different contexts (application domains) were evidence gathering is executed in mobile devices.
Subject(s)
Algorithms , Artificial Intelligence , Bayes Theorem , Computer Communication Networks , Monitoring, Ambulatory/methods , Pattern Recognition, Automated/methods , Signal Processing, Computer-Assisted , Computers, Handheld , Diagnosis, Computer-Assisted/methods , User-Computer InterfaceABSTRACT
This work presents a study on the influence of the aqueous environment on the surface EMG (sEMG) signal recorded in bipolar montage from the abductor pollicis brevis muscle, when only the forearm is immersed in water. Ten men, 30.1+/-4.0 (mean +/- SD) years old, performed ten 2-s 40% MVC isometric contractions of the abductor pollicis brevis muscle in two controlled environments (air and water, at a temperature of 32 degrees C). They were always equipped with electrodes protected with a waterproof adhesive tape. No significant variations (paired Wilcoxon test) due to the environments were observed in the median frequency of the power spectrum (MDF) and in the root mean square (RMS) value of the sEMG signal. These results allow us to assess the methodological criteria to properly record sEMG signals in water and provide the basis to explain different findings obtained by other authors.
Subject(s)
Electromyography/standards , Muscle, Skeletal/physiology , Signal Processing, Computer-Assisted , Adult , Air , Electromyography/methods , Forearm , Humans , Isometric Contraction , Male , Statistics, Nonparametric , WaterABSTRACT
The objective of this work was the study and the development of techniques for acquiring and processing electromyographic signals that can be used for analysis of the behavior of electromyographic variables during fatiguing dynamic activities. Two of the techniques were the RMS value and the MPF, which are commonly used for the analysis of electromyographic signals measured during isometric contractions. A new technique, called MAEC, was proposed, based on the domain of the Wavelet transform. The results showed that the combination of the three techniques together with the protocol for recording electromyographic signals lead to a useful characterization of the behavior of electromygraphic variables.
Subject(s)
Action Potentials/physiology , Algorithms , Electromyography/methods , Muscle Contraction/physiology , Muscle Fatigue/physiology , Muscle, Skeletal/physiology , Signal Processing, Computer-Assisted , Adult , Female , Humans , Male , Reproducibility of Results , Sensitivity and SpecificityABSTRACT
This article presents an algorithm for compression of echocardiographic images. The algorithm is based on the JPEG algorithm and uses a fuzzy inference system to adapt the normalization process of the transformed coefficients through the analysis of the local characteristics of echocardiographic images. The images considered in this paper were acquired in actual echocardiography exams. The proposed encoder guarantees a maximum local signal-to-noise ratio, which is adapted to the characteristics of each sub-block of the image.
Subject(s)
Algorithms , Data Compression/methods , Echocardiography/methods , Fuzzy Logic , Image Interpretation, Computer-Assisted/methods , Imaging, Three-Dimensional/methods , Image Enhancement/methods , Reproducibility of Results , Sensitivity and SpecificityABSTRACT
El test respiratorio utilizando urea marcada con C es un método no invasivo empleado desde 1988 para detectar la presencia de Helicobacter pylori en pacientes portadores de enfermedad ácido péptica. Este método ha demostrado una sensibilidad del 90,2 por ciento y especificidad de 83,8 por ciento . En el Centro de Medicina Nuclear de Guanabara fueron realizados 1.200 test respiratorios, de los cuales el 67 por ciento se reportaron positivos, realizándose nuevos controles después del tratamiento médico, con resultados negativos
Subject(s)
Humans , Breath Tests , Gastritis/etiology , Helicobacter Infections/diagnosis , Helicobacter pylori/isolation & purification , Carbon Radioisotopes , Carbon Dioxide , Stomach/microbiology , Ethanolamines , Gamma Cameras , Gamma Cameras/instrumentation , Gamma Cameras/standards , Gastritis/diagnosis , Helicobacter pylori/physiology , Gastroesophageal Reflux/microbiology , Peptic Ulcer/diagnosis , Peptic Ulcer/etiology , Urease , Urease/metabolism , Urease/pharmacologyABSTRACT
El test respiratorio utilizando urea marcada con C es un método no invasivo empleado desde 1988 para detectar la presencia de Helicobacter pylori en pacientes portadores de enfermedad ácido péptica. Este método ha demostrado una sensibilidad del 90,2 por ciento y especificidad de 83,8 por ciento . En el Centro de Medicina Nuclear de Guanabara fueron realizados 1.200 test respiratorios, de los cuales el 67 por ciento se reportaron positivos, realizándose nuevos controles después del tratamiento médico, con resultados negativos(AU)
Subject(s)
Humans , Helicobacter pylori/isolation & purification , Gastritis/etiology , Carbon Radioisotopes/diagnosis , Helicobacter Infections/diagnosis , Breath Tests/methods , Helicobacter pylori/physiology , Urease/pharmacology , Urease/metabolism , Urease/diagnosis , Gastritis/diagnosis , Stomach/microbiology , Peptic Ulcer/diagnosis , Peptic Ulcer/etiology , Gastroesophageal Reflux/microbiology , Ethanolamines/diagnosis , Carbon Dioxide/diagnosis , Gamma Cameras/instrumentation , Gamma Cameras/methods , Gamma Cameras/standardsABSTRACT
The gastric emptying time is studied with 99mTC-DTPA-labeled mixed meal in 18 patients with chronic gastritis, all confirmed by endoscopic examination and biopsy. Emptying was slow in all such patients, but the intensity of symptomatology showed no correlation with gastric emptying half time.
Subject(s)
Gastric Emptying , Gastritis/diagnostic imaging , Pentetic Acid , Technetium , Adolescent , Adult , Chronic Disease , Female , Gastritis/physiopathology , Humans , Male , Middle Aged , Radionuclide Imaging , Stomach/diagnostic imaging , Technetium Tc 99m Pentetate , Time FactorsABSTRACT
These experiments in the slowly adapting stretch receptor of crayfish test the effects of brief length perturbations (i.e., pulses) when presented in isolation at different constant elongations or superimposed on trapezoidal stretches of different amplitudes. Within "in vivo" lengths, during static responses, perturbations reduced firing rates to below control values and, in extreme cases, could silence the receptor. This effect, or "down-step," was sustained, occurred above a threshold pulse amplitude and background stretch, and increased with both stimulus characteristics, but was not present during dynamic responses. Beyond "in vivo" lengths, and in a few cases within those limits but close to the extremes, the receptor was silent but perturbations could restore activity. Lengthening pulses were more effective than shortening ones in generating after-effects. Perturbations change, during indefinitively long periods, the receptor's length or static sensitivity acting as a negative feedback which tends to maintain the discharge rate within fixed values. Perturbations disclose marked nonlinearities, which suggest that the classical view of a proportional control in the reflex loop in which the receptor participates may not operate in natural conditions.
Subject(s)
Action Potentials , Adaptation, Physiological , Astacoidea/physiology , Mechanoreceptors/physiology , Animals , Electric Stimulation , Electrophysiology , Reaction Time , Time FactorsABSTRACT
Chagas' disease is a serious protozoan infection affecting up to 20% of populations in some endemic areas. Myocarditis and cardiomyopathy occur in 50% of patients who go on to develop chronic Chagas' disease. We have studied a patient with no overt cardiac symptoms who revealed intense myocardial uptake of Tc-99m pyrophosphate. The significance of this finding in relation to early detection and progress of therapy is explored.
Subject(s)
Chagas Disease/diagnostic imaging , Diphosphates , Technetium , Chagas Cardiomyopathy/metabolism , Chagas Cardiomyopathy/prevention & control , Chagas Disease/metabolism , Chagas Disease/therapy , Diphosphates/metabolism , Humans , Male , Middle Aged , Radionuclide Imaging , Technetium/metabolism , Time FactorsABSTRACT
This case report demonstrates an hepatic amebic abscess by scintigraphy, utilizing a new radiopharmaceutical designed specifically for that purpose. The abscess is delineated as a positive lesion after twenty four hours. The agent 131I-labeled bromometronidazole, may prove to be specific for the diagnosis of these abscesses.
