Ivabradine versus metoprolol for heart rate reduction before coronary computed tomography angiography.

Several studies have demonstrated the correlation of heart rate (HR) and image quality in coronary computed tomography angiography. Beta-blocker administration is critical because of its negative inotropic effect. Ivabradine is a selective HR-lowering agent that exclusively inhibits the I(f) current in sinoatrial node cells without having any effect on cardiac contractility or atrioventricular conduction. A total of 120 patients were randomized to oral premedication with ivabradine 15 mg or metoprolol 50 mg. HR and blood pressure (BP) were measured before the administration of premedication and immediately before coronary computed tomographic angiography. The mean time between premedication administration and follow-up was 108 ± 21.5 minutes for ivabradine and 110 ± 22.2 minutes for metoprolol (p = NS). When comparing groups, there were no significant differences in reduction of HR (-11.83 ± 8.6 vs -13.20 ± 7.8 beats/min, p = NS) and diastolic BP (-5.05 ± 14.2 mm Hg vs -4.08 ± 10.8 mm Hg, p = NS), whereas the decrease of systolic BP was significantly lower in patients who received ivabradine compared to those in the metoprolol group (-3.95 ± 13.6 vs -13.65 ± 17.3 mm Hg, p <0.001). In the subgroup of patients who were receiving long-term ß-blocker therapy, significantly stronger HR reduction was achieved with ivabradine (-13.19 ± 5.4 vs -10.04 ± 6.0 beats/min, p <0.05), while the decrease in systolic BP was less (-2.00 ± 13.6 vs -15.04 ± 20.8 mm Hg, p <0.05) compared to metoprolol. In conclusion, ivabradine decreases HR before coronary computed tomographic angiography sufficiently, with significantly less depression of systolic BP compared to metoprolol.

Endovascular brachytherapy prevents restenosis after femoropopliteal angioplasty: results of the Vienna-3 randomised multicenter study.

BACKGROUND AND PURPOSE: The aim of the trial was to investigate the effect of Iridium-192 gamma endovascular brachytherapy on reduction of restenosis after femoropopliteal angioplasty. PATIENTS AND METHODS: Between Oct, 1998 and Jul, 2001 a total of 134 patients have been randomized after successful angioplasty to brachytherapy or sham irradiation in a prospective, randomized, multicenter, double blind controlled trial. Patients with de novo lesion of at least 5 cm or recurrent lesion of any length after prior angioplasty have been enrolled. Brachytherapy was performed with 7F centering catheter. Mean lesion length was 9.1cm (1.5-25 cm) and mean intervention length 13.6 cm (4-27.5 cm) in brachytherapy cohort. RESULTS: In placebo cohort mean lesion length was 10.3 cm (2-25 cm) and mean intervention length 14.1 cm (2-29 cm). A dose of 18 Gy was prescribed 2 mm from the surface of centering balloons. Analyzed (based on angiography) on intention to treat basis the binary restenosis rate at 12 months was 41.7% (28/67) in brachytherapy cohort and 67.1% (45/67) in placebo cohort (chi2 test, P<0.05). Corresponding data for as treated analysis (A total of 38 patients was excluded from analysis due to lack of follow-up, early recurrence within 30 days and >30% residual stenosis after angioplasty) have been 23.4% in the brachytherapy and 53.3% in the placebo group (P<0.05), respectively. The cumulative patency rates after 24 months on intention to treat analysis were 54% in the brachytherapy and 27% in the placebo group (P<0.005). Corresponding data for as treated analysis were 77% in the brachytherapy and 39% in the placebo group (P<0.001). Late thrombosis was not seen. CONCLUSIONS: Significant reduction of restenosis rate was obtained with endovascular gamma brachytherapy after femoropopliteal angioplasty.

Transjugular intrahepatic portosystemic shunt in Vienna--a decade later.

Implantation of a transjugular intrahepatic portosystemic shunt (TIPS) for therapy of portal hypertension has been available in Vienna, Austria, since 1991. Ten years of experience with this technique led the Vienna TIPS Study Group to retrospectively analyse characteristics and outcome of all patients undergoing TIPS in Vienna between 1991 and 2001. Survival and subgroup analyses were performed using Mann Whitney U-tests, log-rank tests, Spearman's correlation and Kaplan-Meier analyses. A total of 523 patients underwent TIPS; 23 for acute variceal bleeding, 350 for prevention of variceal bleeding, and 109 for therapy of refractory ascites. Portal hypertension was caused by cirrhosis in 503 patients; 20 presented with other diseases. 253 patients died within the study period, median follow-up was 5.07 years, median survival 4.51 years. The 3-month, 1-year, 3-year, and 5-year survival rates were 83%, 71%, 57%, and 49%, respectively. Etiology of cirrhosis had no effect on survival; patients with TIPS for refractory ascites had poorer survival rates than those undergoing TIPS for prevention of rebleeding. TIPS is a safe and effective therapy for patients with portal hypertension. The first decade of TIPS in Vienna has shown, in line with other publications, that good criteria for patient selection, effective post-interventional management, and close cooperation between internists, interventional radiologists and liver-transplant centers are the key for a good outcome.