Angiology
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Randomized Controlled Trial Multicenter Study Clinical Trial
Superficial vein valve repair with a new external valve support (EVS). The IMES (International Multicenter EVS Study).
The aim of this international multicenter trial was to evaluate the effects of a new surgical device (Gore External Valve Support-EVS) and technique for external valvuloplasty of the long saphenous vein (LSV). Patients with superficial venous disease and venous hypertension due to pure superficial venous incompetence were randomized into two treatment groups, the first treated with "conventional treatment" (ligation or stripping) and the second with external valvuloplasty with the EVS. Patients with uncomplicated varicose veins within the age range of 35-65 years were included. ⋯ In conclusion results of the first year show efficacy and tolerability of the EVS. In selected patients (superficial LSV incompetence, reflux-dilatation, functional SFJ cusps, incompetence mainly due to enlargement of the vein), the EVS could be an effective alternative to "destructive" ligation and/or stripping of the vein. Prolonged follow-up will indicate the clinical potentials of the EVS.
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Comparative Study
Renal vascular resistance in essential hypertension: duplex-Doppler ultrasonographic evaluation.
Duplex Doppler ultrasonography has been validated as a noninvasive method to evaluate hemodynamic features of renal blood flow in renal and intrarenal arteries in patients with various renal diseases. The significance of duplex Doppler sonography in the evaluation of renal vascular resistance in essential hypertension has not yet been clearly determined. The aim of the present study was to evaluate the renal vascular resistance in patients with essential hypertension by measuring intrarenal arterial resistance (RI) and to correlate RI with renal functional tests and other clinical and laboratory data. ⋯ The renal Doppler resistance index (RI) is increased in essential hypertension and it correlates with renal functional tests as well as with patient's age, duration of hypertension, with a stage of hypertension according to the JNC-VI classification, and with systolic and mean blood pressure. The increased renal vascular resistance (RI) in hypertensive patients could be a sign of developing hypertensive nephrosclerosis and consequently renal failure. The utilization of the renal vascular resistance index (RI), provides a new noninvasive parameter in the followup of patients with essential hypertension.
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Clinical Trial
Expanded polytetrafluoroethylene in external valvuloplasty for superficial or deep vein incompetence.
The authors evaluated the long-term safety of expanded polytetrafluoroethylene (ePTFE) implants used in external valvuloplasty for treatment of incompetence of the long saphenous and common and superficial femoral veins. During a 15-year period patients with superficial and/or deep venous disease and hypertension due to pure superficial or deep vein incompetence underwent an external valvuloplasty with ePTFE sutures, or an ePTFE cardiovascular patch placed as a sleeve around the incompetent vein segment, or an ePTFE tubular graft placed around the venous segment. Postoperative follow-up evaluations consisted of clinical examinations, high-resolution ultrasonography, and color duplex scanning, and a complete blood count performed at 1, 3 and 6 months, and repeated for at least 4 years, every 2 years after the procedure. ⋯ One granuloma (noninfected) developed in association with a tubular ePTFE implant around a long saphenous vein, but it did not necessitate implant removal. Seven patients required (at least after 4 years) a second procedure for recurrent or new venous incompetence. Therefore, in this observational study, ePTFE implants used to treat or correct venous incompetence were well tolerated on a long-term basis.