[Value of numeric intravenous angiography in the study of coarctations of the thoracic aorta].
The investigation of isthmic coarctation of the aorta comprises radiological opacification usually by a retrograde arterial approach. Digitised intravenous angiography (DIVA) is a new way of carrying out this task by a relatively simple and non-invasive technique. We investigated 32 patients with this method and now present our results: the investigation was performed for suspected coarctation in 22 cases and for postoperative assessment in 10 cases. The equipment used was characterised by a variable rate of acquisition from 1 to 3 images per second with a 512 X 512 matrix. The investigation consisted in an intravenous injection of 50 to 100 ml of contrast, usually via a peripheral vein (87.5 p. 100). Overall, DIVA demonstrated the coarctation or the appearances of the site of operation in 97 p. 100 of cases. This high success rate was related to the study population: young cooperative patients capable of maintaining apnoea and remaining still during the procedure. In the 21 patients referred for suspected coarctation (excluding the only failure of the series), the diagnosis was confirmed and the site of coarctation accurately located. The degree of stenosis was assessed subjectively: appearances of the site of coarctation, importance of the collateral circulation. In addition, a videodensitometric study, i.e. a study of the variations of the patterns of grey with respect to time, was carried out in 4 patients; in severe coarctation, a delay of about 4 seconds in the opacification of the zone distal to the stenosis was observed. This analysis is still at the experimental stage, but it may eventually allow reliable quantification of the degree of stenosis.(ABSTRACT TRUNCATED AT 250 WORDS)
D000293:Adolescent; D000328:Adult; D000792:Angiography; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging / Q000601:surgery; D001017:Aortic Coarctation / Q000000981:diagnostic imaging* / Q000601:surgery; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D013382:Subtraction Technique; D013997:Time Factors
Intérêt de l'angiographie numérique par voie veineuse pour l'exploration des coarctations de l'aorte thoracique.