View clinical trials related to Ultrasound.
Filter by:Ultrasound (US) is a more cost-effective, accessible, and available imaging technique to assess anterior talofibular ligament (ATFL) injuries compared with magnetic resonance imaging (MRI). However, challenges in using this technique and increasing demand on qualified musculoskeletal (MSK) radiologists delay the diagnosis. Using datasets from multiple clinical centers, the investigators aimed to develop and validate a deep convolutional network (DCNN) model that automates classification of ATFL injuries using US images with the goal of providing interpretable assistance to radiologists and facilitating a more accurate diagnosis of ATFL injuries. The investigators collected US images of ATFL injuries which had arthroscopic surgery results as reference standard form 13 hospitals across China;Then the investigators divided the images into training dataset, internal validation dataset, and external validation dataset in a ratio of 8:1:1; the investigators chose an optimal DCNN model to test its diagnostic performance of the model, including the diagnostic accuracy, sensitivity, specificity, F1 score. At last, the investigators compared the diagnostic performance of the model with 12 radiologists at different levels of expertise.
The American Society of Anesthesiologists (ASA) does not specify a fasting period for patients with certain comorbidities, such as diabetes, for elective surgery, and does not make a separate recommendation for surgery. The European Society of Anesthesiology (ESA) guidelines do not differentiate between diabetic patients and normal patients. Aspiration of gastric contents is a common cause of perioperative morbidity and mortality. Aspiration can cause hypoxia, bronchospasm, pneumonia, acute respiratory distress syndrome and death. The presence of food or fluid in the stomach before induction of anesthesia is one of the greatest risk factors for perioperative pulmonary aspiration. Sedation and general anesthesia suppress or inhibit physiologic mechanisms (tone of the lower esophageal sphincter and upper airway reflexes) that protect against aspiration. Because restriction of fluid and food intake before general anesthesia is vital for patient safety, Anesthesiology societies have developed guidelines for preoperative fasting. Current ASA guidelines recommend at least 2 hours fasting for clear liquids, 6 hours fasting after a light meal (toast and clear liquids) and 8 hours fasting after a high calorie or fat meal. The information obtained from gastric ultrasound allows anesthesiologists to determine the optimal timing of procedures, type of anesthesia and airway management technique.
The purpose of this study is to study the application of CEUS and SMI technology in superficial lymph node lesions (metastasis, lymphoma, inflammation, etc.), and to provide some diagnostic ideas for non-invasive diagnosis of lymph node lesions.
Background and Aim: Pulmonary aspiration of gastric content in the perioperative period is rare, but it is an important cause of morbidity and mortality that anesthetists never want to encounter. Due to reasons such as emergency surgical procedures, communication problems with pediatric patients or their parents, impaired cognitive function, obesity, diabetes mellitus, chronic liver and kidney diseases, it is observed that there is sometimes inconsistency between the periods defined in the preoperative fasting guidelines in pediatric patients and the state of gastric content and volume encountered in clinical practice. There is a lack of data on children on this issue. In this study, primary we aimed to evaluate the incidence of empty and full stomach in pediatric patients who underwent elective and emergency surgery in our routine anesthesia practice. Also we want to determine the relationship between fasting time and qualitative assessment of gastric content. Secondary this study sought to examine whether correlation between gastric ultrasound finding and fasting time, and also to determine relationship with the current comorbidities. Design: This is a prospective, single blinded, observational study. The minimum sample size required to determine the prevalence of full stomach, 0.05, within the limits of ± 0.025 with 0.95 confidence, was calculated as 292. When calculating with the proposed equation of n = 100 + 50i to determine the factors affecting by logistic regression (here i is the number of variables in the model), the minimum number of samples required for logistic regression analysis was calculated as 300 in case of 4 independent variables in the model. n=100+50*4= 300 Methods: Pediatric patients younger than 18 yr old who are to undergo elective and emergency surgery under general anaesthesia at our hospital are enrolled in this prospective observational study between April and December 2021. Preoperative ultrasound examination of the gastric antrum are performed by one anesthesiologist who has been instructed and supervised by an experienced pediatric radiologist and who is blind to the patient's history. Ultrasonographic measurement of the gastric antral cross-sectional area (CSA) are performed in supine position and right lateral decubitus position (RLD). The gastric antrum is imaged in a sagittal plane, between the left lobe of the liver and the pancreas, at the level of the aorta, as previously described [1]. This examination allowed qualitative assessment of gastric contents according to the three-point grading scale previously described by Perlas and colleagues[2]. Grade 0 was defined by the absence of appearance of any content in a flat antrum in both the supine and the RLD positions. Grade 1 was defined by the appearance of any gastric content in the RLD position only, and Grade 2 was defined by the appearance of any content in both the RLD and the supine positions. The antral cross-sectional area is also calculated in both position, by measuring the longitudinal diameter (D1) and the anteroposterior diameter (D2) of the antrum, from serosa to serosa using this formula [3] Antral area= (π x D1 X D2) / 4. Patients' characteristic data ( age, gender, weight, height, BMI and ASA physical status classification), fasting duration, type of elective and emergency surgery, chronic disease and complications (regurgitation, pulmonary aspiration, etc.) that may develop during the peroperative period are recorded.
According to the hypothesis of this study presented, the effects of smoking on the fetus can be determined by the liver circulation and hepatic metabolism. The basic assumption of this project is; Compensatory and pathological findings can be seen in the fetal liver circulation in babies of mothers who smoke and the findings can be valuable in predicting the direction of fetal development (growth retardation or normal development). In this study, the flow and shunt amounts in the fetal hepatic vessels in normal and smoking pregnant women will be calculated with the help of Doppler US.
Sonazoid as a new generation of ultrasound contrast agent.This study based on the features of Sonazoid specific angiography and high mechanical index,the role of Sonazoid in assessing effectiveness of neoadjuvant chemotherapy in breast cancer patients was explored.
Crohn's disease (CD) is a chronic inflammatory disease in the gastrointestinal (GI) tract. It is characterized by an alternating course between remission and relapse, which necessitates subsequent adjustments in medical therapy. Thus, it is important to have suitable tools to assess disease activity, and currently the reference standard is using ileocolonoscopy. However, ileocolonoscopy causes major patient discomfort and due to logistic reasons, it cannot be performed on a regular basis. High frequency ultrasound (US) is a potentially useful tool to evaluate changes in disease activity in affected bowel segments. Although there are some studies using US in CD patients to construct ultrasonographic scoring systems, there are no validated scores in daily clinical practice. In a recent study by Nylund et al, we used multiple linear regression to select which simple conventional ultrasound parameters that should be included in an ultrasound scoring system (Simple Ultrasound Score of Crohn's Disease (SUS-CD)) using endoscopy as a reference (unpublished data). In this study, we aim to validate this scoring system using an endoscopic score (Simple endoscopic activity score for Crohn's disease (SES-CD)) as reference standard and to assess interobserver variability. The scoring system might be a useful supplement to endoscopy to follow up CD patients.
The prospective study will include 200 patients and 50 critically ill patients, who had an abdominal computed tomography (CT) scan including the L3 level for any clinical reason. Ultrasound scans of the anterior thighs and forearms will be taken after the CT scan within 48 hours. Bioelectrical impedance analysis (BIA) will also be performed. In addition muscle strength, mobility, physical function and nutrition will be assessed. Primary outcome is the prediction of CT-based whole body muscle and fat volume and BIA-based fat and lean body mass from ultrasound-based muscle and fat thickness. Other secondary outcomes include the intra- and interrater reliability of the CT evaluation and ultrasound examination of muscle and fat mass. The relationship between clinical aspects (strength, mobility, physical function, nutrition) and whole body composition is another secondary outcome.