bluuebunny/crossref_metadata_2025_split huggingface dataset:
Doppler and color Doppler imaging in acute transplant failure
Authors: Pelling M. , Dubbins P. A. 
Published: February 2007

AbstractMost renal transplants are lost by rejection. A method is required to identify and discriminate between this and acute tubular necrosis and cyclosporin toxicity. The sonogram of the normal renal transplant is characteristic. Early Doppler studies measuring a rise in vascular impedance in acute rejection showed a high sensitivity and specificity. This appears, at least in part, to have been due to patient selection. We conclude that Doppler studies cannot be used to differentiate between the main parenchymal causes of renal transplant failure, although it can be helpful, with other clinical information, in supporting a diagnosis and in monitoring the effects of treatment. © John Wiley & Sons, Inc.
Doppler and color Doppler ultrasonography in renal transplants: Chronic rejection
Authors: Deane Colin 
Published: February 2007

AbstractAlthough Doppler and color Doppler ultrasonography has been used extensively to examine acute changes in renal allograft function, there have been few reports on the role of Doppler ultrasonography in the assessment of chronic rejection. In those studies that have addressed chronic rejection, there is agreement that changes in renal function are not accompanied by consistent changes in flow wave‐form shape. The pathology of chronic rejection may be very different from the changes seen in acute rejection and its onset is usually gradual. Some authors have suggested that the decline in function is accompanied by lower Doppler frequency shifts (corresponding to lower velocities) in intra‐renal arteries. In a preliminary study comparing grafts with normal renal function and with biopsy‐proven chronic rejection, it has been shown that for grafts with chronic rejection, observed intra‐renal velocities are lower, especially at segmental and interlobar levels. This may be a more reliable reflection of reduced renal blood flow in chronic rejection than conventional Doppler ultrasound analysis of flow waveform shape. However, the diagnostic use of changes to intra‐renal flow velocities in chronic rejection is currently very limited. © 1992 John Wiley & Sons, Inc.
Anomalous position of the gallbladder: Ultrasonographic and scintigraphic demonstration in four cases
Authors: Pradeep V. M. , Ramachandran K. , Sasidharan K. 
Published: February 2007

AbstractAn anomalous position of the gallbladder (GB) is uncommon. Of 40,000 upper abdominal ultrasound examinations, 4 cases of ectopic gall bladder were noted. These were confirmed by hepatobiliary scintigraphy.
Reproducibility of ultrasound measurement of pancreatic size with new advanced high‐resolution dynamic image scanners
Authors: Giandomenico Vincenzo Di , Filippone Antonella , Basilico Raffaella , Spinazzi Alberto , Capani Fabio , Bonomo Lorenzo 
Published: February 2007

AbstractThe reproducibility of ultrasound measurements of the pancreas was investigated in 10 healthy volunteers. All subjects underwent three different evaluations, each consisting of three ultrasound examinations, at 8:00 after overnight fasting, at 12:00 after a solid, standard meal, and at 14:00. The longitudinal and anteroposterior (AP) diameters of the head, body, and tail, as well as the total areas of the gland, were measured in longitudinal and axial scans.Significant differences were observed in the head and body longitudinal diameters measured at 12:00 and in the tail AP diameter at 14:00. We conclude that ultrasonography of the pancreas should be performed in the morning with patients in the fasting state. In these conditions, the reliability of ultrasound measurements of the gland appears to be the highest. © 1993 John Wiley & Sons, Inc.
Sonohysterography for endometrial abnormalities: Preliminary results
Authors: Parsons Anna K. , Lense Jorge J. 
Published: February 2007

AbstractIn examinations where the etiology of an abnormal endometrial sonographic image is not clear, saline infusion through a fine flexible catheter during transvaginal sonography provides visual contrast and uterine expansion. In 39 women, polyps, myomata, synechiae, endometrial hyperplasia, and cancer were correctly described as verified at surgery. Hyperplasia and neoplasia are not distinguishable, but the approach for biopsy and therapy is established by this simple and welltolerated technique, which is here called sonohysterography. © 1993 John Wiley & Sons, Inc.
In vitro and in vivo accuracy of sonographic gallbladder volume determinations
Authors: Andersen Inger Bak , Monrad Henrik , Grønvall Sven , Højgaard Liselotte 
Published: February 2007

AbstractTo assess gallbladder function, sonographic gallbladder volume determinations have been used with increasing frequency. This study presents a modified and automated procedure for gallbladder volume determinations using Simpson's rule of integration, Simpson's method. This method is a standard option in the data systems of many sonographic instruments. Simpson's method was validated in vitro and in vivo, and it was compared with the sum‐of‐cylinders method for gallbladder volume determinations. In vitro assessment indicated that the two methods were equally accurate, with Simpson's method being more precise. The absolute deviation was independent of the size of the volume and of the shape of the gallbladder. In vivo Simpson's method was validated on 11 patients with cholecystitis. The gallbladder volumes (mean 65 mL; Range 20 mL to 130 mL) measured by sonography differed from the aspirated volumes by 1.5 mL (SD 10.4 mL). Thus Simpson's method is an accurate, precise, and fast method for sonographic gallbladder volume determination. © 1993 John Wiley & Sons, Inc.
Renal vein thrombosis and adrenal hemorrhage in the newborn: Ultrasound evaluation of 4 cases
Authors: Orazi C. , Fariello G. , Malena S. , Schingo P. , Ferro F. , Bagolan P. 
Published: February 2007

AbstractRenal vein thrombosis and adrenal hemorrhage can both be encountered in the neonatal period and they may occur at the same time. Inferior vena cava thrombosis can complicate some cases. These diseases can be easily diagnosed by means of ultrasound. The authors present 4 cases in which newborns were affected by renal vein thrombosis associated with adrenal hemorrhage and caval thrombosis, evaluated by means of ultrasound. The echographic aspect of renal, adrenal and caval involvement is described. © 1993 John Wiley & Sons, Inc.
Ultrasonography of capsular morphology in normal and traumatic ankle joints
Authors: Friedrich Jean M. , Schnarkowski Peter , Rübenacker Siegfried , Wallner Bernd 
Published: February 2007

AbstractUltrasonography was used to inspect the ankle anatomy of 20 healthy volunteers. The images produced were correlated with anatomical structures by examining three dissected cadaver ankles. The anterolateral pouch of the articular capsule was identified by ultrasonography in 91% of the normal ankle joints as a hypoechoic area. The posterolateral pouch of the articular capsule also could be identified by ultrasonography as a hypoechoic area in 84% of the normal ankles examined. The lateral aspect of 105 traumatized ankles was examined subsequently. The ultrasound results agreed in 100% of the cases with the operative findings for the anterior talofibular ligament and in 92% for the calcaneofibular ligament. © 1993 John Wiley & Sons, Inc.
Visualization of implantable defibrillator patches by two‐dimensional echocardiography
Authors: Covalesky Veronica A. , McAllister Michael , Chandrasekaran Krishnaswamy , McCormick Daniel J. , Mintz Gary S. , Kutalek Steven P. 
Published: February 2007

AbstractImplantable cardioverter defibrillators are being used with increasing frequency for the management of life‐threatening ventricular arrhythmias. In order to determine whether the titanium mesh of the defibrillator patch causes ultrasonographic acoustical interference, 30 patients underwent prospective serial echocardiographic examination. In addition, studies were reviewed to determine whether the defibrillator patches could be visualized with standard two‐dimensional echocardiography. In no patient did the anterior patch produce acoustical interference, and, unless specific measures were utilized (such as a standoff pad, a zoom feature, or a 5‐MHz transducer), the patches were rarely visualized. © 1993 John Wiley & Sons, Inc.
Reference values for Doppler velocimetric indices from the fetal and placental ends of the umbilical artery during normal pregnancy
Authors: Sonesson Sven‐Erik , Fouron Jean‐Claude , Drblik Susan Pamela , Tawile Carolin , Lessard Manon , Skoll Amanda , Guertin M. C. , Ducharme G. R. 
Published: February 2007

AbstractA range‐gated Doppler ultrasound system combined with a real‐time imaging system was used to determine arterial blood velocity values from the fetal and placental ends of the umbilical cord in 269 normal pregnancies between 17 and 40 weeks, menstrual age. The systolic–diastolic ratio (S/D), pulsatility index (PI), and resistance index (RI) were higher at the fetal end compared to the placental end of the cord. The individual differences in these Doppler indices, obtained between the fetal and placental recording sites, were inversely related to menstrual age: S/D: r = −0.38, p < 0.001; PI: r = −0.25, p < 0.001; and RI: r = −0.15, p < 0.01. After normalization for the angle of insonation, the peak systolic velocity was higher and the enddiastolic velocity was lower at the fetal than at the placental end of the cord. It is concluded that routine recordings for Doppler velocimetric indices should take into account the recording site on the umbilical cord in order to reduce methodological sources of variance, especially during midgestation. Furthermore, the data presented here in the form of the median and percentile values are proposed as normal reference values to facilitate this procedure. © 1993 John Wiley & Sons, Inc.
Quantitative characterization of arcuate artery hemodynamic change in normal pregnancy with Doppler ultrasonography
Authors: Hata Kohkichi , Hata Toshiyuki , Manabe Atsushi , Makihara Ken , Kitao Manabu 
Published: February 2007

AbstractUsing color and pulsed Doppler ultrasonography, arcuate arterial velocimetry was carried out in 91 normal women, at 16–40 weeks, menstrual age. The arcuate arterial hemodynamics was assessed by the calculation of the resistance index (RI). A curvilinear relationship was found between the RI value of the arcuate artery obtained from the placental site in the uterus and menstrual age (R2 = 0.328). The relationships between the RI value of the arcuate artery obtained from the nonplacental site (R2 = 0.268) or the averaged RI value between the placental and nonplacental sites (R2 = 0.321) and menstrual age were both linear. Normal ranges of RI values of arcuate arteries during pregnancy for the placental site, nonplacental site, and their average values were generated. These results provide a foundation for evaluating uteroplacental velocimetry in normal pregnancy using Doppler ultrasonography. © 1993 John Wiley & Sons, Inc.
Ultrasonic fetal weight estimation: Analysis of inter‐ and intra‐observer variability
Authors: Chang T. C. , Robson Stephen C. , Spencer John A. D. , Gallivan Stephen 
Published: February 2007

AbstractStandard ultrasound measurements were performed by two observers in 40 third‐trimester fetuses. Observers were blinded to the results of the meaurements. Estimated fetal weight (EFW) was calculated using two published formulae. The intra‐observer standard deviation for EFW, assessed using one‐way analysis of variance, was <75 g for both observers. The 95% prediction intervals for inter‐observer comparisons of EFW, calculated using the limits of agreement method, were − 187.3 g to 139.8 g, and − 159.9 g to 124.3 g, using the two formulae. The results suggest that measurements of EFW are reproducible. The prediction interval is comparable to the weekly fetal weight increment in normal fetuses. © 1993 John Wiley & Sons, Inc.
Application of intracoronary ultrasonography in the study of coronary artery pathophysiology
Authors: Rasheed Qaiser , McB. Hodgson John 
Published: February 2007

AbstractCoronary endothelial function, arterial distensibility, and elastic recoil were assessed in various groups of patients using intracoronary ultrasonic (ICUS) imaging. We found evidence of endothelial dysfunction in patients with risk factors for coronary artery disease even before atherosclerosis could be detected angiographically or with sensitive ICUS imaging. There was marked reduction of arterial distensibility in atherosclerotic arterial segments even with minor disease. Distensibility was partially restored in lesions following coronary balloon angioplasty (PTCA) or directional atherectomy (DCA). We also noted significantly greater elastic recoil following PTCA in soft lesions compared with hard lesions. We conclude that the use of ICUS imaging in cardiac catheterization laboratory provides useful information regarding various physiologic parameters. This capability will add new dimensions to the evaluation and management of patients with coronary artery disease. © 1993 John Wiley & Sons, Inc.
Mechanisms and outcomes of angioplasty and atherectomy assessed by intravascular ultrasound imaging
Authors: Fitzgerald Peter J. , Yock Paul G. 
Published: February 2007

AbstractCatheter‐based intravascular ultrasound is a relatively new imaging tool to examine endovascular structure. One major goal for the development of intravascular ultrasound imaging has been to help clarify the mechanism of interventional therapies such as balloon angioplasty and directional atherectomy. Pathologic studies have suggested that plaque distribution and composition are key features that relate to initial and long‐term success of coronary interventions. However, relatively little is known by angiography about the nature of plaque in the clinical setting. Intravascular ultrasound imaging provides a high resolution, “on‐line” method of tracking the effects of catheter interventions such as balloon angioplasty and atherectomy. Because of its ability to visualize tissue beneath the luminal surface, ultrasound is generating new insights into the effect of plaque composition and distribution on the response to catheter therapies. With pre‐procedure ultrasound imaging, it is increasingly possible to predict the result of a particular intervention, offering the potential for developing strategies of lesion‐targeted therapy based on certain plaque characteristics. This article presents the early results of the GUIDE trial as a “works in progress” view of the role of intravascular ultrasound in helping interventionalists to understand—and to optimize—angioplasty and atherectomy. © 1993 John Wiley & Sons, Inc.
Coexisting calcified inferior vena cava thrombus and adrenal hemorrhage in the neonate: Report of three cases
Authors: Tran‐Minh Van A. , Genin Gilles , Pracros Jean‐Pierre , Foray Patrice , Bourgeois Jacques 
Published: February 2007

AbstractCoexisting calcified inferior vena cava (IVC) thrombus and adrenal hemorrhage are uncommon in children. We present three such cases diagnosed by ultrasound in three boys who were born after 41‐, 38‐, and 38‐week gestations, respectively. In all cases the pregnancy and delivery were unremarkable. The birthweight was 3,630 g, 3,210 g, and 3,390 g, respectively. Left adrenal hemorrhage occurred in all cases. Associated left renal vein thrombus occurred in two cases. The mean followup was 8.5 years. In two cases ultrasound showed persistence of a calcified thrombus and residual stenosis of the IVC. In the third case the IVC thrombus had almost disappeared. © 1994 John Wiley & Sons, Inc.
Amyloidosis of the thyroid gland: Role of ultrasonography
Authors: El‐Reshaid K. , Al‐Tamami M. , Johny K. V. , Madda J. P. , Hakim A. 
Published: February 2007

AbstractWe studied the role of ultrasound assessment of the thyroid gland in detecting amyloid deposition in 9 patients confirmed to have renal amyloidosis because the thyroid gland is a readily accessible organ. Ultrasound examination of the thyroid gland showed a distinctive abnormal appearance in 7 patients. There was enlargement of one or both lobes of the thyroid, a high echogenicity approaching that of the surrounding connective tissue, and a very fine homogeneous echotexture similar to ground glass appearance. Four patients showed dilated follicles in the thyroid gland. The other two patients had normal ultrasound findings. Open wedge biopsy of the thyroid gland in 4 patients, (3 with abnormal ultrasound findings and 1 with normal ultrasound findings) showed amyloid deposits in the 3 patients with abnormal echo findings and no amyloid deposits in the 1 patient with normal findings. In 10 healthy individuals, 10 patients who were just initiated on maintenance hemodialysis and another 10 patients on dialysis for more than 1 year, the thyroid gland was of normal size and appearance in the ultrasound examination. We conclude that ultrasound examination by an experienced radiologist is a useful tool in the diagnosis of thyroid amyloidosis. © 1994 John Wiley & Sons, Inc.
Lytic bone lesions suspected for metastasis: Ultrasonically guided fine‐needle aspiration biopsy
Authors: Civardi Giuseppe , Livraghi Tito , Colombo Paolo , Fornari Fabio , Cavanna Luigi , Buscarini Luigi 
Published: February 2007

AbstractUltrasonically guided fine‐needle aspiration biopsy (US‐FNAB) was performed in 30 patients with a lytic bone lesion suspected for metastasis detected by conventional radiological examinations. The patients were selected for US‐FNAB on the basis of the ability of the ultrasound examination to clearly visualize the lesion. The cytological diagnosis was confirmed at surgery in 3 cases, and at clinical and radiological follow‐up after more than 6 months in the remaining cases. The lesions were located mostly in the thoracic skeleton (ribs and sternum) and pelvic bone. We diagnosed malignancy in 26 cases and benign lesions in 2 cases. An inadequate sample was obtained in 1 case, and 1 case yielded a false‐negative result. According to these results, we obtained a sensitivity of 93%. We conclude that ultrasonically guided fine‐needle aspiration biopsy is a useful technique to obtain a pathological diagnosis in cases of lytic bone lesions that can be visualized with this imaging technique. © 1994 John Wiley & Sons, Inc.
Failed or difficult laparoscopic cholecystectomy: Can preoperative ultrasonography identify potential problems?
Authors: Carmody Eamonn , Arenson Ann‐Marie , Hanna Sharif 
Published: February 2007

AbstractA prospective study was performed to assess the role of preoperative ultrasonography in predicting failed or difficult laparoscopic cholecystectomy. Fifty patients underwent detailed preoperative ultrasound examinations. The number and size of calculi, evidence of acute or chronic cholecystitis, gallbladder morphology, and the presence or absence of aberrant anatomy were documented. A comparison was made of the surgical outcome and the ultrasound findings in each patient.Six patients were converted to open cholecystectomy because of inflammatory changes in the gallbladder. The preoperative ultrasound studies in 5 of these patients demonstrated evidence of cholecystitis and cholelithiasis. Gallbladder wall thickening and contraction were also seen. Five gallbladder resections had intraoperative difficulties; preoperative ultrasonography demonstrated a thickened gallbladder wall in 2. Of 31 uneventful cases, 7 had evidence of gallbladder wall thickening and/or contraction. There were no ultrasound features that identified between the unsuccessful, difficult, or uneventful laparoscopic cholecystectomies.We conclude that detailed preoperative ultrasound evaluation of the gallbladder in patients destined for laparoscopic cholecystectomy is of little value in screening for difficult or unsuitable cases. © 1994 John Wiley & Sons, Inc.
Contribution of transcranial color‐coded real‐time sonography to the etiopathogenetic classification of middle cerebral artery stenosis
Authors: Becker Georg , Lindner Alfred , Hofmann Erich , Bogdahn Ulrich 
Published: February 2007

AbstractTranscranial color‐coded real‐time sonography (TCCS) and cranial computed tomography were applied to patients with middle cerebral artery (MCA) stenosis to evaluate whether these techniques may disclose additional aspects of the pathophysiology of the stenotic lesion. In 15 patients with MCA stenosis identified by transcranial Doppler sonography, the echogenicity of the stenotic segment was estimated subjectively by TCCS. The density of the stenotic segment, prior to being detected by TCCS, was quantified by computed tomography. In 5 of the 15 patients, transcranial image‐directed Doppler sonography identified a hyperechogenic lesion in association with the stenotic vascular segment; computed tomography demonstrated a “dense” artery (Hounsfield units [HU] > 120) in the corresponding vascular segment. In 10 patients the echogenicity of the stenotic segment was found to be normal, with a computed tomography density of >100 HU in the corresponding segment. Hyperechogenic and hyperdense stenotic vascular segments in TCCS and computed tomography, respectively, may indicate an arteriosclerotic vascular lesion with calcium deposits. Normal echogenicity and normal to slightly elevated computed tomography‐density of a stenotic vascular segment may suggest the presence of a thrombotic/embolic lesion. © 1994 John Wiley & Sons, Inc.
Color Doppler ultrasonography and serum CA 125 in the differentiation of benign and malignant ovarian tumors
Authors: Chou Cheng‐Yang , Chang Chiung Hsin , Yao Bor‐Lin , Kuo Hong‐Chang 
Published: February 2007

AbstractColor Doppler ultrasonography and serum CA 125 were used to evaluate 114 adnexal tumors prior to surgery. Six patients were excluded from this study because of ovarian cancer, borderline ovarian malignancy, and tubal gestation. A total of 108 patients were eligible: 83 patients with benign and 25 patients with malignant ovarian tumors. Resistance index (RI) was used to determine the peripheral resistance of intratumoral vessels. The cutoff point for the RI was defined as 0.5. The blood flow was considered to be normal when the RI was greater than 0.5 and abnormal when it was less than 0.5. The blood flow was detected in 100% of malignant tumors and 59% of benign tumors. The initial cutoff value for CA 125 was 35 U/mL. Sensitivity, specificity, positive predictive value, and negative predictive value were compared in terms of RI, serum CA 125, and a combination of the two. Our conclusion is that the combination of RI and CA 125 gives a sensitivity of 100% and negative predictive value of 100%. If the cutoff point of CA 125 was raised from 35 to 65 U/mL, then a specificity of 100% and positive predictive value of 100% were also attained with the use of RI and CA 125 without changes in sensitivity or negative predictive value. We conclude that the combination of color Doppler ultrasonography and serum CA 125 is an effective method to differentiate benign from malignant ovarian tumors. © 1994 John Wiley & Sons, Inc.