Renal Arter Stenozunu Saptamada Doppler Ultrasonografi ve Üç Boyutlu Kontrastli Manyetik Rezonans Anjiografinin Etkinliği

The aim of our retrospective study was to compare the value of doppler sonography (US) and three-dimensional gadolinium-enhanced MR angiography (3D-MRA) for detecting renal artery stenosis. Sixty-four patients (36 men, 28 women), suspected of having renal artery stenosis with clinical and laboratory findings were enrolled in this study. 102 renal arteries were evaluated with doppler US, contrast-enhanced 3D- MRA and selective renal artery digital subtraction angiography (DSA) respectively. Doppler US and MR angiographic findings were com- pared with DSA which is the gold standard technique for the diagnosis of renal artery stenosis. Stenosis in renal artery was detected in 82 renal arteries by Doppler US. Visible narrowing of renal artery was present in 70 arteries on source and MIP images by MRI. Stenosis was found in 65 arteries by DSA. According to these findings doppler US had a sensitivity of 97% and specificity of 49% compared to DSA. Magnetic resonance angiography was the more accurate screening test with sensitivity of 97%, specifity of 81% compared doppler US. Doppler US offers many advantages as it is a rapid, non-invasive screening method in the diagnosis of renal artery stenosis, also it is does not need any contrast agents. 3D-MRA allows more accurate evaluation of patients with stenosis on doppler US without the known risks associ- ated with nephrotoxic contrast agents, ionizing radiation or arterial catheterization and it may be usefull tool to preventing false positive tests.