Search results for "doppler ultrasonography"
showing 10 items of 14 documents
Contrast-enhanced transcranial Doppler ultrasonography in the diagnosis of brain death
2013
The diagnosis of brain death (BD) is based on clinical criteria including deep coma, brain stem areflexia and apnoea. Depending on different local guidelines, confirmatory technical tests are sometimes mandatory.1 Since the 1990s, transcranial Doppler sonography (TCD) has found its place in these circumstances and fulfils most of the criteria of an ‘ideal test’ in confirming BD. To confirm intracranial circulatory arrest (CA) with Doppler sonography, typical flow patterns must be recorded in bilateral intracranial and extracranial brain-supplying arteries.2 A completely absent intracranial flow signal is not a reliable sign to determine CA because this can be due to transmission problems. I…
Color doppler ultrasonography of soft-tissue masses
1998
Purpose: To evaluate the capability of color Doppler ultrasonography to differentiate between benign and malignant soft-tissue tumors. Material and Methods: We reviewed the ultrasonographic (US) and color Doppler (CD) findings in 46 consecutive patients with a palpable periskeletal mass. The presence of 3 or more vascular hila and of tortuous and irregular internal vessels within the lesions was considered an indication of malignancy. The CD diagnosis was compared with that obtained at US alone. Results: The sensitivity and specificity of CD were respectively 85% and 92%; these values were higher than those obtained at US alone, respectively 75% and 50%. Arteriovenous malformations present…
PANCREATIC CARCINOMA VERSUS CHRONIC FOCAL PANCREATITIS: CONTRAST-ENHANCED POWER DOPPLER ULTRASONOGRAPHY FINDINGS
2005
Background: We assessed the potential usefulness of contrast-enhanced power Doppler ultrasonography (US) for differentiating pancreatic carcinoma from chronic focal pancreatitis. Methods: Twenty-six consecutive patients with ductal carcinoma (n=16) and chronic focal pancreatitis (n=10) underwent power Doppler US examinations before and after intravenous injection of an air-based contrast agent (Levovist, Schering, Berlin, Germany). Final diagnosis was obtained by surgery in all patients. The following parameters before and after intravenous administration of contrast agent were evaluated for each lesion: number, morphology and course of the vessels within the lesion and time to maximum dete…
Association of renal resistive index with aortic pulse wave velocity in hypertensive patients
2014
Background: Recent data suggest that renal haemodynamic parameters obtained by duplex Doppler sonography, especially the intrarenal resistive index (RI), may be associated with systemic vascular changes. However, conflicting data exist about the independent relationship between aortic stiffness and RI. The aim of this study was to evaluate the relationship between RI and arterial stiffness, assessed by aortic pulse wave velocity (aPWV), in hypertensive patients. Design: Cross-sectional study. Methods: We enrolled 264 hypertensive subjects aged between 30 and 70 years. They were divided into two groups, either with normal renal function (n=140) or with chronic kidney disease (CKD) (n=124). E…
Transcranial Doppler ultrasonography in the assessment of cerebral circulation arrest: improving sensitivity by trancervical and transorbital carotid…
2009
INTRODUCTION: Transcranial Doppler (TCD) can detect the cerebral circulation arrest (CCA) in brain death. TCD is highly specific, but less sensitive because of false-negatives accounting for up to 10%. The aim of the study was to explore the diagnostic accuracy of TCD and to determine whether it can be augmented by strategies such as the insonation of the extracranial internal carotid artery (ICA) and sequential examinations. METHODS: Data of 184 patients, who met clinical criteria of brain death, observed from 1998 through 2006, were retrospectively reviewed. The study of cerebral arteries was performed through the transtemporal approach, suboccipital insonation of the vertebro-basilar sys…
Role of Color Doppler Ultrasonography to Address the treatment of Epicondylitis with Mini-Invasive Techniques.
2008
Ocena zależności pomiędzy objawami klinicznymi przewlekłej niewydolności żylnej i ultrasonograficznymi cechami refluksu żylnego u chorych z żylakami …
2001
Wstęp: Celem badania było porównanie objawów klinicznych przewlekłej niewydolności żylnej ze stopniem nasilenia refluksu żylnego, stwierdzanym w badaniu ultrasonograficznym u chorych z żylakami kończyn dolnych. Materiał i metody: Badaniu poddano 50 chorych — 100 kończyn dolnych: 23 kończyny bez żylaków (w tych przypadkach żylaki występowały na drugiej kończynie), 13 kończyn z żylakami, które nie powodowały dolegliwości, 49 kończyn z żylakami, którym towarzyszył obrzęk i/lub dolegliwości bólowe, 15 kończyn z żylakami z towarzyszącymi zmianami skórnymi (z wyjątkiem owrzodzenia). Przeprowadzono ultrasonograficzną (USG Duplex-Doppler) ocenę refluksu w żyłach: udowej, podkolanowej, piszczelowej …
Aktueller Stand der Hirntoddiagnostik in Deutschland
2000
□ Der Hirntod kann grundsatzlich nur dann diagnostiziert werden, wenn eine schwere akute Hirnschadigung vorliegt und andere Storungen sicher auszuschliesen sind. Primare Hirnschadigungen betreffen das Gehirn direkt (zum Beispiel intrakranielle Blutungen, Raumforderungen, schweres Schadel-Hirn-Trauma), sekundare Hirnschadigungen indirekt (zum Beispiel Hypoxie nach kardiopulmonaler Reanimation). Supratentorielle Hirnschadigungen betreffen das Groshirn, infratentorielle Hirnschadigungen den Hirnstamm und/oder das Kleinhirn. □ Koma, Hirnstammareflexie und Ausfall der Spontanatmung sind die obligaten klinischen Hirntodzeichen. Wenn diese Zeichen im Verlauf unverandert fortbestehen, ist der irrev…
The hemodynamic approach to evaluating adolescent varicocele
2012
During adolescence, the risk of developing a varicocele increases. Prevalence is less than 1% in boys aged younger than 10 years, but approaches that of the general adult population (about 15%) during puberty. For adolescent males with varicoceles, surgical risk factors have not yet been clearly delineated and clinical severity correlates poorly with prognosis. Fortunately, the widespread use of Doppler ultrasonography is transforming the diagnostic work-up for this demographic. A continuous reflux detected by color Doppler ultrasound (CDUS) is thought to have a negative prognostic value and evidence suggests that a peak retrograde flow above 38 cm per second is a powerful predictor of lack…
Color Doppler ultrasonography in pediatric intussusception.
1994
CDU was used in 11 children with intussusception. Demonstration of vascular images within the "pseudokidney" mass was possible in none of 11 cases. Of them, eight could be treated by hydrostatic reduction. In the remaining case, marked edema of the bowel wall did not allow reduction, and surgery had to be performed: no necrosis was observed in the surgical specimen. Both patients in whom CDU failed to demonstrate vascular signals had necrosis at surgery, and bowel resection was performed. Because of the limited number of patients examined at this time, no firm conclusions can be drawn from our experience. However, CDU seems a promising technique in detecting vascular changes occurring in in…