Doppler-ultrasound measurements in renal allografts depend on the patient's body position.

Steubl, D; Papachristou, E; Wolf, P; Roos, M; Lutz, J; Heemann, U; Stock, KF

doi:10.1024/0301-1526/a000173

journal article

Document type:: Journal Article; Article
Author(s):: Steubl, D; Papachristou, E; Wolf, P; Roos, M; Lutz, J; Heemann, U; Stock, KF
Title:: Doppler-ultrasound measurements in renal allografts depend on the patient's body position.
Abstract:: Due to anatomical reasons a position-dependent renal allograft artery stenosis is being discussed (e.g. only in patient's upright position). The tortuous course of the allograft artery complicates the direct, angle-dependent measurement of maximum systolic flow velocities (vmax). So indirect signs such as intraparenchymal vmax and resistance index might be helpful, but it is unknown how these values change physiologically when patient's body position changes.We examined renal allografts of 60 patients (38 male, 22 female) with stable graft function using B-Mode-, colour-coded duplex-sonography and pulsed-wave-Doppler. We measured vmax and RI-values of three interlobar arteries in the cortex and allograft artery in the hilus in patients standing upright and in horizontal position. Corresponding values were analyzed for significant differences.Intraparenchymal RI-values and vmax were significantly reduced in patients upright compared to the horizontal position (16 %, MW=0.59 vs. MW=0.70, p < 0.001 resp. 6 %, MW=30.18 cm/s vs. MW=32.17 cm/s, p = 0.045). Similar results could be detected in the renal hilus.Patients with stable graft-function show significant, position-dependent differences of the intraparenchymal and hilar RI-values and maximal systolic flow velocities. These changes of Doppler parameters has to be kept in mind for the correct diagnosis of a position dependent allograft artery stenosis.
Journal title abbreviation:: Vasa
Year:: 2012
Journal volume:: 41
Journal issue:: 2
Pages contribution:: 114-9
Language:: eng
Fulltext / DOI:: doi:10.1024/0301-1526/a000173
Pubmed ID:: http://view.ncbi.nlm.nih.gov/pubmed/22403129
Print-ISSN:: 0301-1526
TUM Institution:: Fachgebiet Nephrologie (Prof. Heemann); Institut für Medizinische Statistik und Epidemiologie
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