期刊
INVESTIGATIVE RADIOLOGY
卷 46, 期 8, 页码 509-514出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/RLI.0b013e3182183a95
关键词
MR elastography; MRI; kidney; stiffness
资金
- NIH [HL085307, EB001981, DK73608, HL77131, 001981, 018898, DK73013]
Objectives: Magnetic resonance elastography (MRE) allows noninvasive assessment of tissue stiffness in vivo. Renal arterial stenosis (RAS), a narrowing of the renal artery, promotes irreversible tissue fibrosis that threatens kidney viability and may elevate tissue stiffness. However, kidney stiffness may also be affected by hemodynamic factors. This study tested the hypothesis that renal blood flow (RBF) is an important determinant of renal stiffness as measured by MRE. Material and Methods: In 6 anesthetized pigs MRE studies were performed to determine cortical and medullary elasticity during acute graded decreases in RBF (by 20%, 40%, 60%, 80%, and 100% of baseline) achieved by a vascular occluder. Three sham-operated swine served as time control. Additional pigs were studied with MRE 6 weeks after induction of chronic unilateral RAS (n = 6) or control (n = 3). Kidney fibrosis was subsequently evaluated histologically by trichrome staining. Results: During acute RAS the stenotic cortex stiffness decreased (from 7.4 +/- 0.3 to 4.8 +/- 0.6 kPa, P = 0.02 vs. baseline) as RBF decreased. Furthermore, in pigs with chronic RAS (80% +/- 5.4% stenosis) in which RBF was decreased by 60% +/- 14% compared with controls, cortical stiffness was not significantly different from normal (7.4 +/- 0.3 vs. 7.6 +/- 0.3 kPa, P = 0.3), despite histologic evidence of renal tissue fibrosis. Conclusion: Hemodynamic variables modulate kidney stiffness measured by MRE and may mask the presence of fibrosis. These results suggest that kidney turgor should be considered during interpretation of elasticity assessments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据