Search results for "sonography"

Use of middle cerebral velocity and blood pressure for the analysis of cerebral autoregulation at various frequencies: The coherence index

1998

A common component in many protocols for the evaluation of cerebral autoregulation is the comparison of transcranial Doppler ultrasound (TCD) velocities with blood pressure recordings, in which correlations between these two signals correspond to impaired autoregulation. With long data sets and complicated paradigms, however, visual inspection alone cannot adequately distinguish random coincidence from consistent correlation in a statistically valid fashion. We suggest and illustrate the use of the coherence index for this purpose. To illustrate this technique, long-term recordings of TCD velocity and blood pressure were obtained from 6 normal subjects and using 23 data segments from 8 pati…

Three-dimensional ultrasound diagnosis of ruptured subcapsular liver hematoma caused by HELLP syndrome

2008

Intraoperative vascular assessment for estimation of risk in primary closure of omphalocele and gastroschisis.

2013

Surgical repair of anterior abdominal wall defects is often complicated by a discrepancy between the eviscerated organs and the intra-abdominal space available. Primary closure of the abdominal wall may result in increased intra-abdominal pressure and consecutive circulatory impairment. We report the results of a retrospective and consecutive prospective study evaluating the influence of different witameters on mortality and morbidity in children with gastroschitis and omphalocele. Both studies demonstrated that real-time sonographic investigations, intraoperative Doppler duplex sonography, and colour-coded Doppler sonography provide the oppurtunity to collect objective intraoperative data.…

A Comprehensive Ultrasonographic Assessment of Pediatric and Adolescent Varicocele Can Improve Surgical Results.

2020

<b><i>Purpose:</i></b> Undetected refluxing venous systems could cause persistence/recurrence of varicoceles in patients undergoing varicocelectomy. Color Doppler ultrasound (CDUS) is an important tool in the diagnosis and follow-up of varicocele, and could be successfully used to detect a venous reflux in the iliac-deferential district, usually involved in the recurrence/persistence of varicocele. <b><i>Materials and Methods:</i></b> We compared 2 historical series of patients treated with Palomo laparoscopic varicocelectomy between 1994 and 2018. In group 1, preoperative scrotal CDUS was obtained, while in group 2, additional inguinal CDUS w…

Diagnostic tools for female urethral diverticulum: Current perspectives

2019

Although once considered quite a rare condition in the past, female urethral diverticulum (UD) would now appear to have a higher frequency, perhaps due to greater attention from physicians. To date, there is no agreement on which is the best method for diagnosis of female UD. Traditionally, the approach was based on quite invasive techniques, such as voiding cystourethrography, and double-balloon urethrography, with satisfactory results but relevant limitations. More recent high-resolution imaging techniques, such as 2D-3D ultrasonography (US) and magnetic resonance imaging (MRI) have also been applied in the study of the abnormalities of the female urethra. US had the advantage of the outp…

Intravascular ultrasound imaging of arterial wall architecture.

1992

Intravascular ultrasound (IVUS) is a promising new technique for assessing vascular morphology and structure. Controversy exists whether the three-layer appearance of the arterial wall correctly reflects the histologic structures of the intima, media, and adventitia. We performed an experimental study to clarify the three-layer appearance. The vessel wall architecture was analyzed by IVUS on eight different kinds of plastic cylinders, 24 normal blood vessels from pigs, and 59 human arterial segments. A distinct three-layer appearance was observed on all the plastic cylinders when the ultrasound beam was perpendicular to the wall. A three-layer appearance was also seen in the arterial wall, …

Architecture in cortical bone and ultrasound transmission velocity

1993

The square of ultrasound transmission velocity in a material is correlated to the modulus of elasticity, which is an indicator of its mechanical properties. This might make the measurement of ultrasound transmission velocity useful in the noninvasive diagnosis of bone diseases. Bone, however, is not an isotropic material but is architecturally structured. The aim of our study was to investigate and especially to quantify the influence of architecture in cortical bone on ultrasound transmission velocity. Twenty-two rectangular, flat specimens of cortical bone were prepared from diaphysis of fresh pig radius. Ultrasound transmission velocity was measured parallel and perpendicular to directio…

Technetium-99m mercaptoacetyltriglycine clearance: reference values for infants and children.

1995

Six hundred and thirty-nine clearance studies performed in children aged 7 days to 19 years utilizing technetium-99m mercaptoacetyltriglycine (MAG 3) were retrospectively analysed. Standardized conditions for the investigation included: parenteral hydration (60 ml/hxm2 body surface) in addition to normal oral fluid intake, weight-related dose of99mTc-MAG 3 (1 MBq/kg body weight, minimum 15 MBq) and calculation of clearance according to Bubeck et al. Of the 513 children, 169 included in this analysis could be classified as “normal” with regard to their renal function. Normal kidney function was judged by the following criteria: normal GFR for age, normal tubular function (absence of proteinu…

Prenatal sonographic chest and lung measurements for predicting severe pulmonary hypoplasia.

1999

Pulmonary hypoplasia was diagnosed sonographically in 32 fetuses from 20 to 33 weeks of gestation. In addition to standard biometry, transverse thoracic diameter (TTD), sagittal thoracic diameter (TSD), thoracic circumference (TC) and lung diameter (LD) were measured in all cases and compared with known nomograms. The fetuses were divided into five groups according to the main sonographic findings: group 1—skeletal dysplasia; group 2—renal agenesis; group 3—diaphragmatic hernia; group 4—hydrothorax; and group 5—others. Severe pulmonary hypoplasia (PH) was diagnosed prenatally in all cases on the basis of LD measurements. In 17 (53.1 per cent) out of 32 cases TTD was below the 5th percentile…

Lung Ultrasonography – A Paraclinical Investigation Promoter in Community-Acquired Pneumonia Diagnosis in Children

2019

Abstract Lung ultrasonography is an excellent alternative to chest radiography, with better sensitivity, specificity, positive and negative predictive values and, finally, with better accuracy. The lung ultrasonography is proven to be useful in trying to reduce the request of chest radiography. In the opinion of most specialists, lung ultrasonography is recommended to be a valuable tool for the diagnosis of community-acquired pneumonia in children. Considering the fact that clinical examination remains essential because it suspects the diagnosis, the evolution does not require radiologic follow-up, also the pathologic findings at the clinical examination may change over the course of a day,…