Doppler-Ultrasound measurements in renal allografts depend on the patients body position

Steubl, Dominik; Papachristou, Evangelos; Wolf, Petra; Roos, Marcel; Lutz, Jens; Heemann, Uwe; Stock, Konrad

doi:10.1024/0301-1526/a000173

Cited by 5 publications

(3 citation statements)

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“…The Resistance Index (RI) measured by Doppler sonography during the early posttransplant period is considered to reflect interstitial edema within the transplanted kidney and has shown a potential to predict worse allograft function . But allograft recipients with stable graft‐function show significant differences of the intraparenchymal and hilar RI values and maximal systolic flow velocities depend on patient's body position . Furthermore, sonography is limited in providing quantitative information concerning renal perfusion.…”

Section: Discussionmentioning

confidence: 99%

Functional evaluation of transplanted kidneys using arterial spin labeling MRI

Heusch

Wittsack

Blondin

et al. 2013

Magnetic Resonance Imaging

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Section: Discussionmentioning

confidence: 99%

Functional evaluation of transplanted kidneys using arterial spin labeling MRI

Heusch

Wittsack

Blondin

et al. 2013

Magnetic Resonance Imaging

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“…Although US is the first-line imaging modality to evaluate renal transplant vasculature, it is highly operator dependent and may often be limited by patient body habitus and overlying bowel gas (8). Furthermore, the measurement of flow velocities used to determine arterial stenoses may vary with patient positioning and vessel tortuosity (9). US does not provide detailed anatomic images and MRA is useful to define the exact location and length of stenosis, and number and location of renal arteries, information that may be useful in planning angiography.…”

Section: Discussionmentioning

confidence: 99%

MR Angiography of Renal Transplant Vasculature with Ferumoxytol:

2016

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Rationale and Objectives This work aimed to quantify the differences in signal-to-noise ratio (SNR) and vessel sharpness between steady-state and first-pass magnetic resonance angiography (MRA) with ferumoxytol in renal transplant recipients. Materials and Methods We performed a retrospective study of adult patients who underwent steady-state and first-pass MRA with ferumoxytol to evaluate renal transplant vasculature. SNR was calculated in the external iliac artery, and vessel sharpness was calculated in the external iliac and renal transplant arteries for both acquisitions. Data were compared using Student’s t test. Results Fifteen patients were included (mean age 56.9 years, 10 males). The mean SNR of the external iliac artery was 42.2 (SD, 11.9) for the first-pass MRA and 41.8 (SD, 9.7) for the steady-state MRA (p = 0.92). The mean vessel sharpness was significantly higher for the steady-state MRA compared to first-pass MRA for both external iliac (1.24 vs. 0.80 mm−1, p < 0.01) and renal transplant arteries (1.26 vs. 0.79 mm−1, p < 0.01). Conclusion Steady-state MRA using ferumoxytol improves vessel sharpness while maintaining equivalent SNR compared to conventional first-pass MRA in renal transplant patients.

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“…This is especially true in the immediate postoperative setting after the surgical anastomosis has been created. Elevated PSVs may be caused by transient kinking of the transplanted renal artery based on the patient's body position . If this occurs, repeat examination in the sitting and standing positions may be required.…”

Section: Discussionmentioning

confidence: 99%