PubMed Health⌕ Search

Biomedical subjects

G de Tovar

Publications and source records attributed to G de Tovar.

16 recordsLinked to original sources
PubMed1991

[Deep phlebitis of the lower limbs. Diagnostic value of D-dimer assays].

D-dimers are specific fibrin degradation products which have been measured in plasma and used as a diagnostic test for deep vein thrombosis of the lower limbs. However, the results published so far have often been conflicting. We compared the results of D-dimer assays by the latex method (positivity threshold: 0.5 microgram/ml) in 3 groups of patients: 22 patients with clinically suspected thrombophlebitis confirmed by doppler ultrasound; 22 patients with clinically suspected thrombophlebitis not confirmed by doppler ultrasound; and 17 hospital patients with other diseases serving as controls. The sensitivity of a D-dimer concentration higher than 0.5 microgram/ml was 96 percent and its specificity 69 percent. In an internal medicine unit where the prevalence of thrombophlebitis was 50 percent, the positive predictive value of a D-dimer concentration higher than 0.5 microgram/ml was 81 percent, and its negative predictive value was 94 percent. Thus, because of its low specificity as compared with imaging methods the D-dimer assay test cannot be used to diagnose deep vein thrombosis, but as it has good sensitivity and is rapidly performed, safe and inexpensive it can be used as an emergency examination which, when negative, makes this diagnosis unlikely.

Fibrin Fibrinogen Degradation Products↗
PubMed1978

[Scintigraphic appearance and particular arteriographic aspects intrahepatic cholestasis].

Based on one case history, it is reviewed here that prolonged cases of obstructive jaundice can take on deceiving appearences, and all the more so when they fall within the framework of a "biological gap". Extensive distension of the extra and intrahepatic bile ducts are at the basis of images with multiple, radiating hilar gaps on scintigraphy, and of "chicken nests" and "Swiss cheese" at hepatographic times in selective hepatic arteriography. These rather uncommon images should lead to a diagnosis of a surgical cholestatic liver.

Adult↗
PubMed1975

[Scintigraphy of the choroid plexus (choroid plexography)].

An increase concentration of pertechnate in the choroid plexus was demonstrated in 21 patients pretreated with tin pyrophosphate injected intravenously 24 hours before the examination. Using this technique, the choroid plexus are seen quite clearly, giving indirectly a picture of the intracerebral ventricles. A dynamic study was carried out in 12 patients, 3 of whom had abnormalities of the cerebrospinal fluid circulation demonstrated by isotope cisternography. The results obtained were characterised by a typical diphasic curve with variations in the pathological cases.

Brain Neoplasms↗
PubMed1975

Technetium-99m labeling by means of stannous pyrophosphate: application to bleomycin and red blood cells.

A new technique of technetium labeling using stannous pyrophosphate instead of stannous chloride as reducing agent for pertechnetate has been applied to red blood cells and bleomycin. Results are so encouraging that this technique could be extended to other compounds capable of forming stable complexes with reduced technetium. No saline washes of red cells are necessary before or after the addition of pertechnetate. No purification step is performed after labeling of bleomycin.

Bleomycin↗
PubMedDate not supplied

[Echography and cerebral gammagraphy in craniofacial injuries].

The authors review the aid provided and sometimes essential nature of echographic and isotopic studies in cranio-facial trauma when seeking neurological complications -in particular intracranial haematomas and cerebrospinal fluid fistulas. They describe the principles of each of these technics, their indications, performance and limitations. These examinations are simple, rapid and perfectly harmless but must be carried out in specialised departments, which limits their use.

Brain↗