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Biomedical subjects

F Angelini

Publications and source records attributed to F Angelini.

At least 73 records · Page 4Linked to original sources
PubMed1988

[Echography with portable equipment. Its possibilities and limits in the hepatobiliary area].

Ultrasound examination of the liver by simple low-cost equipment (LCUS) is currently performed. In order to evaluate the accuracy of this imaging technique in the detection of liver diseases, 150 outpatients were examined with a LCUS unit. The same patients were then re-examined with more sophisticated equipment (SEUS) in a department of radiology. The images thus obtained were compared to the previous ones: LCUS appears to be a valuable screening method, even though several US features--i.e. hyperechogenicity of the liver, focal hypoechoic lesions, and microlithiasis--are better demonstrated by more sophisticated units.

Adolescent↗
PubMed1987

[Internal echography. Problems inherent in iconographic documentation and reporting. A proposal for codification].

Problems concerning iconographic documentation and reporting in abdominal ultrasound are discussed. The authors propose schemes for a minimal iconographic documentation of the various organs and systems in case of negative examinations or to be associated with the documentation of the lesion in pathologic cases. Afterwards more complex questions in reporting are discussed, concerning dimensions of organs, echostructure and terminology in use with the proposal of a standard pattern. The authors point out how codification and standardization both of images and report are by now necessary in echography, in order to make examinations more comparable and capable of being evaluated.

Diagnosis, Differential↗
PubMed1987

[High-resolution echography and angiography in the study of vascular accesses for hemodialysis].

In 23 hemodialytic patients with clinically presumed complications of the vascular access the arteriovenous shunt was studied by high resolution ultrasonography (US) and by angiography. In 21/23 cases US identified the shape of the shunt correctly; in these patients US always showed the alterations of vascular size (stenosis, aneurysm) and complete occlusion, also detecting the intravascular extension of thrombosis. In 3 patients US identified partial venous thrombosis missed on angiography; furthermore, unlike angiography, US gave precise information on the vascular wall and perivascular tissue changes. These findings suggest that US may represent the first imaging procedure in the study of the vascular access in hemodialytic patients; angiography might be performed when US findings are uncertain or when a vascular map is needed for surgery.

Adult↗
PubMed1986

Knee arthrography: effects of various contrast media and epinephrine on synovial fluid.

Changes in synovial fluid leukocytes, total protein, and total complement were studied in 58 patients after they underwent single contrast material-enhanced knee arthrography with ionic (sodium iothalamate, sodium meglumine diatrizoate, meglumine iothalamate) and nonionic (iopamidol, iohexol) contrast media. In 30 of 58 cases, 0.3 mg epinephrine was also injected. In patients examined without epinephrine, a significant increase in the number of leukocytes was observed when sodium iothalamate and sodium meglumine diatrizoate were used. When administered with epinephrine all ionic compounds produced significant leukocytosis; articular reactions were most evident in patients examined with sodium salts. No inflammatory changes in the synovial fluid were observed when nonionic compounds were used. These data suggest that sodium-containing compounds produce a greater reaction in the joint compared with other contrast media, nonionic compounds are better tolerated by the joint, and epinephrine increases the articular reaction to ionic contrast media.

Adolescent↗
PubMed1986

[Radiological and echographic aspects of milk of calcium bile].

In a series of 17 patients with milk of calcium bile radiologically examined, 9 underwent even ultrasound. A constant sonographic pattern was not observed, and an explanation for this finding is attempted. Ultrasound is not considered a suitable procedure for identifying this pathology, and it should be associated with plain x-ray examination.

Bile↗
PubMed1986

[A simple method of studying cruciate ligaments in arthrography].

After a review of the methods employed for arthrographic visualization of cruciate ligaments (CL), the authors present a new technique to separately study the anterior and posterior CL during traction. This technique enables to obtain a good visualization of CL and a good diagnostic accuracy; it can radiographically demonstrate a pathologic sagittal instability of the knee; it is easy to perform and is easily repeatable in different patients.

Humans↗
PubMed1985

[Echography in the diagnosis of spontaneous hematoma of the rectus muscle].

After a brief explanation of the pathogenesis and of the clinical picture of spontaneous rectus muscle hematoma, the Authors describe 9 diagnosed cases by ultrasonography. The various echographic appearances of this disease are described and the importance of ultrasonography for a correct diagnosis and to avoid unnecessary laparotomy is emphasized.

Abdominal Muscles↗
PubMed1985

[Ioexol in arthrography].

Single contrast knee arthrography was performed in a group of 50 patients, using either Urografin or Ioexol as contrast agents. Both contrast media were well tolerated clinically and no significant difference was found to exist as far as image quality is concerned. However, while Urografin produced a significant increase of the white cells in the synovial fluid, no inflammatory change was observed in the synovial fluid after Ioexol. So we believe that Ioexol is a significantly preferable contrast medium in arthrography, especially in patients with inflammatory joint diseases.

Adolescent↗
PubMed1984

Gas-containing gallstones: their influence on ultrasound images.

The ultrasound image of gas-containing gallstones was evaluated in three cases. In two, the stones were studied in vitro in a phantom gallbladder by ultrasound, and then by microradiographic techniques. The third case was investigated in vivo by ultrasound and computerized tomography (CT). The presence of gas-containing fissures, which are not detectable on ultrasound, was demonstrated. In contrast, wider fissures, or a true gas bubble, produce reverberation echoes which depend upon the quantity of gas present within the gallstone.

Cholecystectomy↗
PubMed1984

Effects of current pulses on the sustained discharge of visual cells of Limulus.

Current pulses were used in the eccentric and retinular cells of the Limulus lateral eye to produce changes in the interspike interval of the discharge sustained by a constant light level. The effects on the interspike interval of hyperpolarizing and depolarizing perturbations, applied at various delays from the previous spike, were measured for different intensities and durations of the current pulse. The results show that when the perturbations were applied in the first part of the interval, effects contrary to what is normal were produced (i.e, hyperpolarizing pulses decreased the interspike interval instead of increasing it and vice versa for depolarizing pulses). Here we discuss briefly the implications on neural encoding models.

Animals↗
PubMed1983

[Liver metastases with posterior acoustic shadow in echography: causes and differential diagnosis].

Seven cases of metastases with acoustic shadow have been detected in a series of 108 liver metastases. In two cases this echographic pattern corresponded to calcified metastases and in one case to a necrotic metastasis, containing gas. In the last four cases the presence of an acoustic shadow (all colon carcinoma metastases in chemotherapy) must be attributed to the tissue characteristics of the lesion, since neither calcifications nor gas could be shown by CT. A possible effect of chemotherapy in causing this type of image can be thought to exist; this, according to the finding of hypoechogenic metastases turning to the same above mentioned pattern following chemotherapy.

Antineoplastic Agents↗
PubMed1980

Resonant response of a neural model and of Limulus ommatidia to double frequency stimulation.

Signals which are the sum of two sinusoids of frequencies v1 and v2 are used to stimulate: i) an electronic analog of the leaky integrator neural model, ii) the visual neurons of the Limulus lateral eye. This makes it possible to investigate the resonant amplification of the impulse density modulation for v1 + v2 which approaches the free-run discharge rate; this resonance is predicted by the Volterra series representation of the leaky integrator (Poggio and Torre, 1977). The resonant responses obtained look very similar for the simulated discharge and for the experimental one.

Animals↗