جستجوی مقالات مرتبط با کلیدواژه « color doppler ultrasound » در نشریات گروه « پزشکی »

This paper aimed to assess the clinical effects of abdominal aortic balloon occlusion (AABO) under color Doppler ultrasound guidance in treating pelvic tumors.

Various databases, which contained China National Knowledge Infrastructure, Wanfang Data, Chinese Biomedical Literature Database, PubMed, Excerpta Medica Database (Embase), and Cochrane Library, were used for searching randomized controlled studies published from 2010 to present. The quality of the literature was assessed using the Newcastle-Ottawa Scale (NOS). Outcome measurements included intraoperative blood loss, transfusion volume, operative time, hospital stay, recurrence, and postoperative complications.

Six reference articles were obtained, including 223 patients who underwent AABO and 300 patients who did not. The NOS score was greater than 7 points in both groups. Meta-analysis showed that the intraoperative blood loss, transfusion volume, and surgery duration of patients undergoing pelvic tumor resection with AABO were all reduced (95% confidence interval (CI): -1504.53~-762.10, P<0.00001; 95% CI: -902.22~-575.45, P<0.00001; 95% CI: -80.20~-26.54, P<0.0001). No difference was discovered in the occurrence of postoperative complications, including nerve injury (95% CI: 0.30~1.34, P=0.23) and urethral injury (95% CI: 0.19~1.97, P=0.41) between both groups. The incidence of wound infection was relatively low (95% CI: 0.22~0.81, P=0.010). Additionally, no difference was discovered in hospital stay (95% CI: -6.85~0.79, P=0.12) and recurrence (95% CI: 0.45~1.53, P=0.12) between both groups (P>0.05).

AABO under color Doppler ultrasound guidance can reduce intraoperative blood loss, transfusion volume, and operative time during pelvic tumor resection and can also reduce the incidence of some postoperative complications.

To explore the application of contrast-enhanced ultrasound and color Doppler ultrasonography in the treatment of primary hepatocellular carcinoma (PHC) after Transhepatic Artery Chemoembolization (TACE).

49 patients with primary hepatocellular carcinoma were treated with TACE for 3-5 times. Before and after treatment, digital subtraction angiography, contrast-enhanced ultrasound and color Doppler ultrasound were performed. The lesions before and after contrast-enhanced ultrasonography and color Doppler ultrasonography were compared. The residual or recurrence and swelling of lesions before and after contrast-enhanced ultrasonography and color Doppler ultrasonography were analyzed. Detection of the capsule of the lesion.

The detection accuracy of contrast-enhanced ultrasound (95.77%) was significantly higher than that of color Doppler ultrasound (84.51%) (P<0.05). The detection rate of tumor envelope by contrast-enhanced ultrasound (22.54%) was significantly higher than that by color Doppler ultrasound (9.86%) (P < 0.05). The accuracy of detecting residual or recurrent lesions by contrast-enhanced ultrasound (91.67%) was significantly higher than that by color Doppler ultrasound (58.33%) (P<0.05).

The rate of bone metabolism of perimenopausal women in Xuzhou is not optimistic. We need to pay close attention to the risk of bone metabolism disorder of perimenopausal women with older age, diabetes mellitus and osteoporosis, so as to provide useful help for improving the quality of life of perimenopausal women in Xuzhou.

Varicocele is one of the leading causes of infertility in men. Resistance index (RI) in testis is a parameter indicating parenchymal perfusion and microvascular functions. Increased RI in the testis of patients with varicocele might be a sign of impairments in microvascularization and a significant decrease in testicular perfusion. In the present study, RI in capsular and intraparenchymal testicular arteries was evaluated in patients with varicocele who underwent varicocelectomy.

This prospective cohort study was performed in 2019-2020 in Guilan, Iran. Sixty-six patients were included. Semen analysis was also done before surgeries. Patients with at least one disorder in semen analysis entered the study. RI in testicular arteries was measured by an experienced radiologist before surgeries. Six months after varicocelectomy, all patients underwent the same semen analysis and ultrasound imaging. Data were analyzed using SPSS software. The tests for analysis included McNemar Test and Wilcoxon and p<0.005 was considered as the significance level.

According to the results, 42 patients (63.6%) had positive changes in sperm analysis after surgeries. Sperm analysis showed a significant increase in number, concentration, morphology, and motility of sperm after surgeries (p<0.001). Further measurements of capsular and intratesticular RI in all patients also indicated a significant decrease (p<0.001).

Increased RI might be associated with impaired microperfusion in testis followed by impairments in semen. Moreover, mean capsular and intratesticular RI in patients decreased after surgeries and this decrease was significantly more in patients who had improvement in their semen parameters.

Diagnostic ultrasound has been used to detect human disease especially fetus abnormalities in recent decades. Although the harmful effects of diagnostic ultrasound on human have not been established so far, several researchers showed it has had bioeffects in cell lines and in experimental animals. Three-dimensional (3D), four-dimensional (4D), and color Doppler sonography are new techniques which are widely used in diagnostic fetal ultrasonography. The study aims to evaluate some bioeffects of 3D, 4D, and color Doppler sonography in different exposure times according to the acoustic output which is set as ultrasound scanner’s default for fetal sonography in the second trimester on human dermal fibroblast (HDF) cells. Exposure times selected consist of 10, 40, 70, and 100 seconds for 3D sonography, 10, 20, and 30 minutes for 4D sonography, and 10, 30, and 50 seconds for color Doppler. Cell viability, cell proliferation, and apoptosis induction on HDF cells were assessed using MTT assay, immunocytochemistry of Ki-67, and Terminal Transferase-mediated dUTP End-labeling (TUNEL) assay, respectively. Exposure of cells to 3D, 4D, and color Doppler modes led to decreased cell viability and increased proliferation rate of HDF. None of the diagnostic ultrasound modes induced cell apoptosis. . The results indicated that 3D, 4D, and color Doppler techniques may affect the cell viability and proliferation of HDF cells, however, have no effects on the induction of apoptosis probability. Further long-term studies with other molecular endpoints are required.

Telomere length and stability is a biomarker of aging, stress, and cancer. Shortening of telomeres and high level of DNA damages are known to be associated with aging. Telomere shortening normally occurs during cell division in most cells and when telomeres reach a critically short length, DNA damage signaling and cellular senescence can be triggered. The induction of an adaptive response by space radiation was first documented in 2003. Telomere length alterations are among the most fascinating observations in astronauts and residents of high background radiation areas. While study of the chronic exposure to high levels of background ionizing radiation in Kerala, India failed to show a significant influence on telomere length, limited data about the NASA astronaut Scott Kelly show that exposure to space radiation can induce telomeres to regain length. Interestingly, his telomeres shortened again only a couple of days after returning to Earth. The difference between these situations may be due to the differences in radiation dose, dose-rate, and/or type of radiation. Moreover, Scott Kelly’s spacewalks (EVA) could have significantly increased his cumulative radiation dose. It is worth noting that the spacewalks not only confer a higher dose activity but are also characterized by a different radiation spectrum than inside the space craft since the primary particles would not interact with the vehicle shell to generate secondary radiation. Generally, these differences can possibly indicate the necessity of a minimum dose/dose-rate for induction of adaptive response (the so called Window effect).

Pelvic ring fractures (PRF) and acetabular fractures (AF) are among the most challenging orthopedic injuries. These injuries usually involve operative fixation, with considerable delay after the accident. There are limited studies regarding the effects of delayed surgery on the risk of venous thromboembolism (VTE) in these patients.

In this study, the effect of delayed fixation of PRF and AF on the risk of preoperative VTE was investigated.

There were 86 patients with PRF and/or AF enrolled in the current study. Preoperatively, the presence of deep venous thrombosis (DVT) was examined utilizing Color Doppler ultrasound (CDU). The time interval between accident and CDU was recorded (time delay). Finally, the time delay was compared between patients with and without DVT formation.

The CDU revealed the presence of DVT in lower limb veins of 11 patients (12.8%). The time delay between the accident and CDU was significantly longer in patients with DVT formation (12.4 ± 4.1 days versus 7.6 ± 2.4 days; P < 0.001).

Delayed fixation of PRF and AFmay increase the risk of preoperative VTE. The authors suggest surgical fixation in these patients as soon as possible in cases without definite contraindication for early fixation.

There are no generally accepted criteria for the ultrasonographic diagnosis and grading of varicocele. We aimed to determine the best position and site for color Doppler ultrasonographic (CDUS) evaluation of the testicular vein to define the clinical grades of varicocele ultrasonographically.

This study consisted of 103 men (44 normal and 59 with clinical varicocele). First, WHO clinical grade of varicocele was determined by physical examination. Then, the diameter of largest testicular vein at four different sites was measured in both upright and supine positions with or without Valsalva maneuver. Finally, the cut-off points of venous diameter for different clinical grades were determined using the values of the position and sites that had the strongest correlation with the clinical grades.

The strongest correlation between venous diameter and clinical grade of varicocele was observed when the venous diameter was measured at the level of epididymal head in the upright position with Valsalva maneuver (r: 0.87, P-value < 0.0001). In aforementioned conditions, venous diameter of 2.35 mm (sensitivity 87%, specificity 87%) can distinguish normal subjects from grade 1 varicocele, venous diameter of 3.15 mm (sensitivity 58%, specificity 70%) can discriminate grade 1 from grade 2, and venous diameter of 3.75 mm (sensitivity 83%, specificity 70%) can differentiate grade 2 from grade 3. Furthermore, venous diameter of 2.65 mm (sensitivity 91%, specificity 89%) can distinguish normal subjects from patients with clinical varicocele.

The best position for CDUS examination of patients suspected of having varicocele is the upright position with Valsalva maneuver, and the best site for venous diameter measurement is at the level of epididymal head.

Early detection of stenosis in carotid artery is essential because it directly affects the patients'' clinical management and is of prognostic value. Therefore, estimating mechanical properties of this artery in normal and atherosclerosis cases is important as far as medical treatment is concerned. We applied a logistic regression model to predict carotid artery stenosis in a group of patients based on the quantitative features extracted from the processing of the conventional color Doppler ultrasound images.
Our database includes 128 patient records consisting 10 quantitative features. The database is then randomly divided into the training and validation samples including 98 and 30 patient records respectively. The training and validation samples are used to construct the logistic regression model and to validate its performance. Finally, important criteria such as sensitivity, specificity, accuracy and receiver operating characteristic curve (ROC) analysis for this method are evaluated.
Our results show that the logistic regression model is able to classify correctly 28 out of 30 cases presented in the validation sample. The output of this method showed a high positive predictive value of 94%.
We have established a logistic discriminator approach which is able to predict the probability of stenosis in the carotid artery using features extracted from ultrasonic measurements on ultrasound imaging .