ABSTRACT
This trial was aimed at comparing the tolerance and the safety of Iopentol, a new nonionic monomeric contrast agent, with Iohexol, a reference compound already on the market and commonly used in similar trials. Sixty adult patients (41 women and 19 men, aged 23 to 76 years, mean age: 51.4 years) referred to our Department of Radiology for varicography 24 hours before surgery were examined; the trial was designed as a double-blind, parallel two-group comparison of Iopentol 300 mg/ml and Iohexol 300 mg/ml with 30 patients in each treatment group. No adverse reactions were observed in our series of patients. Only slight and not clinically significant changes were observed in heart rate and blood pressure values. The immunohistochemical parameters were studied for postvaricography anatomopathologic complications of the injected veins (A-Actin ML, Vimentin, Factor VIII, CD31, CD68, CK, Ulex Europaeus I, Lecitin, Desmin, Laminin) and no statistically significant differences were observed between the two groups. The histologic specimens showed only venous wall changes, as diagnosed on admission. All radiographs were classified as technically adequate and contrastographic efficacy was defined as "good" in all patients by two independent radiologists. To conclude, our trial on the efficacy and safety of the two nonionic monomeric radiographic contrast agents Iopentol and Iohexol proved the two contrast agents to be equally effective and well tolerated, which makes Iopentol a good alternative to Iohexol in varicography.
Subject(s)
Contrast Media , Iohexol , Triiodobenzoic Acids , Varicose Veins/diagnostic imaging , Adult , Aged , Double-Blind Method , Female , Humans , Immunohistochemistry , Male , Middle Aged , Radiography , Reproducibility of Results , Varicose Veins/pathology , Veins/pathologyABSTRACT
The authors compared the adequacy of phlebography and color-Doppler US in the diagnosis of subclavian-axillary thrombosis, or Paget-Schroetter syndrome. Ten patients with subclavian-axillary thrombosis (8 men and 2 women, aged 16 to 55 years, mean age: 30 years) were examined over a two-year period. All of them underwent color-Doppler US and conventional phlebography in the same session. US findings were in agreement with phlebographic results in all cases as to thrombosis presence and site. The thrombosis involved the subclavian-axillary vein in 8 cases, the subclavian-innominate vein in 1 case and both veins in 1 case. Color-Doppler US, however, yielded no information relative to the superior vena cava; these data were always obtained with phlebography even though in 4 cases that segment had to be studied with phlebographic opacification via contralateral route. Furthermore, US failed to clearly demonstrate the thrombosis involving the last axillary valve; preserving this valve is indeed the main aim of fibrinolysis since its integrity, at this level, prevents venous reflux independent of subclavian-axillary trunk recanalization, thus reducing the severe symptomatologic sequelae following postphlebitic damage. Phlebography showed the valve and its possible involvement in all cases. In 4 cases phlebography also demonstrated compressive thoracic inlet syndrome, which had been missed by US, yielding the main anatomic elements for following surgery. To conclude, the authors suggest noninvasive color-Doppler US as the screening method of choice, while phlebography remains the gold-standard technique to be performed in all Doppler positive cases: in fact, the latter method yields more pieces of information and is more panoramic than the former, besides allowing fibrinolysis effects to be studied and the possible presence of an associated thoracic inlet syndrome to be investigated.
