Time-intensity curve analysis of contrast-enhanced ultrasound is unable to differentiate renal dysfunction in the early post-transplant period - a prospective study.

BACKGROUND: Contrast enhanced ultrasonography (CEUS) assessment of kidney allografts mainly focuses on graft rejection. However, studies on delayed graft function (DGF) without acute rejection are still lacking. The aim of this study was to build a time-intensity curve (TIC) using CEUS in non-immunological DGF to understand the utility of CEUS in early transplantation. METHODS: Twenty-eight patients in the short-term postoperative period (<14 days) were divided according to the need for dialysis (early graft function [EGF] and [DGF]) and 37 subjects with longer than 90 days follow-up were divided into creatinine tertiles. Time to peak [TTP] and rising time [RT were compared between groups. RESULTS: EGF and DGF were similar, except for creatinine. In comparison to the late group, medullary TTP and RT were shorter in the early group as well as the delay regarding contrast arrival in the medulla (in relation to cortex) and reaching the medullary peak (in relation to artery and cortex). In the late group, patients with renal dysfunction showed shorter temporal difference to reach medullary peak in relation to artery and cortex. CONCLUSIONS: Although it was not possible to differentiate EGF and DGF using TIC, differences between early and late groups point to blood shunting in renal dysfunction.

High frequency ultrasound with color Doppler in dermatology.

Ultrasonography is a method of imaging that classically is used in dermatology to study changes in the hypoderma, as nodules and infectious and inflammatory processes. The introduction of high frequency and resolution equipments enabled the observation of superficial structures, allowing differentiation between skin layers and providing details for the analysis of the skin and its appendages. This paper aims to review the basic principles of high frequency ultrasound and its applications in different areas of dermatology.

High frequency ultrasound with color Doppler in dermatology

Abstract: Ultrasonography is a method of imaging that classically is used in dermatology to study changes in the hypoderma, as nodules and infectious and inflammatory processes. The introduction of high frequency and resolution equipments enabled the observation of superficial structures, allowing differentiation between skin layers and providing details for the analysis of the skin and its appendages. This paper aims to review the basic principles of high frequency ultrasound and its applications in different areas of dermatology.

Historia de la ecografía: Introducción en la Argentina: Pioneros en su utilización / History of ultrasound: Introduction in Argentina: pioneers in its use

Historia y desarrollo de la ecografía en Argentina, descripta a través de los distintos profesionales que fueron pioneros en su utilización.

Doppler ultrasound in canine pregnancy.

OBJECTIVE: The aim of this article is to review the current knowledge of Doppler ultrasound in canine pregnancy. A brief introduction of Doppler principles and their applications in human obstetrics is also included. METHODS: A review of the peer-reviewed published literature was conducted of the articles pertaining to the use of Doppler ultrasound in canine pregnancy, general Doppler principles, and Doppler applications in human obstetrics. RESULTS: In bitches, Doppler ultrasound has been used to assess ovarian, uterine, umbilical, fetal aorta, common carotid artery, and fetal caudal vena cava blood flow during normal gestation. Most of these vessels increase their blood flow during normal pregnancy. The resistive index and systolic/diastolic ratio of the uterine arteries have been recently described in an experimental pharmacologically induced model of abnormal canine gestation. Both indices progressively increase up to abortion, probably because of progesterone deprivation. Moreover, resistive index abnormalities have been found in canine cases of spontaneous abnormal gestations as described in human medicine. CONCLUSIONS: Doppler ultrasound is a useful method for assessing development of the placental and fetal circulation during normal and abnormal canine pregnancy. Further studies are still necessary to widely use this technique in clinical practice.

Evaluación de la disfunción erectil de origen vascular por medio del ultrasonido doppler duplex

Se estudiaron 20 pacientes que cumplieron los criterios de inclusión para el diagnóstico y tratamiento de la disfunción rectil de origen vascular y 10 pacientes con disfunción erectil psicógena, mediante la evaluación con ultrasonido doppler duplex, antes y después de aplicación de sustancias vasoactivas intracavernosas. Mediante un anaálisis estadistico de las variables estudiadas se observó que los pacientes con disfunción de origen psicógeno presentaban registros vasculares y velocidades normales en arterias cavernosas (grupo control). El grupo con sospecha clínica de etiología vascular demostró una diferencia significativa en el diámetro de la arteria cavernosa y en el flujo sistólico post inyección intracavernosa de sustancias vasoactivas entre los dos grupos. El Ultrasonido doppler duplex es un método útil en el diagnóstico de la disfunción erectil de origen vascular, diferenciando lesiones de tipo arterial y dando signos indirectos de sospecha de patología venosa. Es un método no invasivo, de bajo costo y sin efectos secundarios, de elección en el tratamiento racional y efectivo de una entidad que hasta hace poco tiempo no era factible demostrar en forma no invasiva