American journal of roentgenology skip to main page content home current issue archive contact subscribe alerts help search go advanced search â» user name password sign in american roentgen ray society comparative accuracy of renal duplex sonographic parameters in the diagnosis of renal artery stenosis: paired and unpaired analysis gabrielle j. Williams 1 , 2, petra macaskill 2, siew f. Chan 2, thomas e. many mg viagra use Karplus 3, winkle yung 3, elisabeth m. Hodson 1 and jonathan c. purchase viagra online Craig 1 , 2 1centre for kidney research and department of nephrology, children's hospital at westmead, hawkesbury rd. (locked bag 4001) westmead, new south wales 2145, australia. 2screening and test evaluation program, school of public health, university of sydney, camperdown, new south wales 2006, australia. 3department of vascular medicine, concord hospital, concord, sydney, australia. buy canadian viagra online today Abstract objective. viagra sale The purpose of this study was to evaluate the test performance of duplex sonographic parameters in screening for hemodynamically significant renal artery stenosis, which occurs in approximately 5% of persons with hypertension. 100 mg viagra cost Materials and methods. viagra generic buy online A comprehensive literature search was conducted to find studies on the diagnosis of renal artery stenosis in which duplex sonography and intraarterial angiography were compared and in which sensitivity and specificity were calculated. Medline (1966-2005), embase (1988-2005), and reference lists were searched and the authors contacted. Data were subjected to meta-analysis according to the hierarchical summary receiver operating characteristic curve model. Heterogeneity in test performance relating to population and design features was investigated. When to take viagra20 Results. natural power herbal viagra From 1,357 titles, 88 studies involving 9,974 arteries in 8,147 patients were included. The following four parameters were evaluated: peak systolic velocity (21 studies), acceleration time (13 studies), acceleration index (13 studies), and renal-aortic ratio (13 studies). viagra vs tadalafil generic The corresponding diagnostic odds ratios (ors) were 60. Which pill is better viagra or viagra 9 (95% ci, 28. 3-131. viagra without a doctor prescription miami 2), 28. 9 (95% ci, 7. 1-117. does 5 mg of viagra work 2), 16. 0 (95% ci, 5. buy viagra 1-50. 6), and 29. natural power herbal viagra 3 (95% ci, 12. 7-67. 7). Results based on studies in which parameters were directly compared showed that peak systolic velocity had greater accuracy than renal-aortic ratio (relative diagnostic or, 1. natural power herbal viagra 8; p = 0. viagra private prescription 03; nine studies) and acceleration index (relative diagnostic or, 5. 3; p < 0. can i buy viagra online yahoo answers 001; five studies). purchase generic viagra Acceleration time versus acceleration index showed no evidence of a difference in accuracy (relative diagnostic or, 1. viagra without a doctor prescription 1; p = 0. 65; nine studies). Analysis of peak systolic velocity used in combination with other parameters compared with peak systolic velocity alone (seven studies) showe. order cheap generic viagra