title: Tissue hydration in kidneys during preservation: a relaxometric analysis of time-dependent differences between cortex and medulla.
abstract: Cold preservation of donor organs induces hypothermia-related tissue edema as a result of a reduced activity of the ATP-dependent sodium pump at low temperatures. Hypothermia-induced tissue edema occurs in kidney preservation and is a significant risk factor for delayed graft function (DGF) after transplantation. DGF remains a major problem in kidney transplantation and is significantly associated with preservation injury. The state of hydration of cold-stored organs can be assessed from a biopsy for determination of the wet/dry weight ratio. As a non-invasive method to determine tissue hydration MRI T1 and T2 relaxometry can be used. In this study we have compared changes in tissue hydration in UW-preserved porcine kidneys with increasing cold ischemia times (CIT) using wet/dry weight ratio and MR ralaxometry. The results of the two techniques were correlated to evaluate the use of MR relaxometry. Wet/dry weight ratios of the renal cortex decreased with prolonged CIT (P < 0.01) whereas those of the medulla did not change significantly. T1 values of the cortex decreased with prolonged CIT (P < 0.01). T2 values of the cortex showed a non-significant decline with increased CIT. No significant changes in T1 and T2 were found in the medulla. The correlation between T1 and the wet/dry weight ratio of the cortex was significant (P = 0.05, linear correlation coefficient 0.8698). We conclude that MR relaxometry can be a valuable noninvasive technique to assess tissue hydration in cadaveric donor kidneys before transplantation.
authors.affiliation: Department of Surgery, University Hospital Groningen, The Netherlands.
authors.forename: J A
authors.initials: JA
authors.lastname: van der Hoeven
authors.forename: I J
authors.initials: IJ
authors.lastname: de Jong
authors.forename: R F
authors.initials: RF
authors.lastname: Wolf
authors.forename: R L
authors.initials: RL
authors.lastname: Kamman
authors.forename: R J
authors.initials: RJ
authors.lastname: Ploeg
mesh_terms: D000241:Adenosine; D000493:Allopurinol; D000818:Animals; D005260:Female; D005978:Glutathione; D007328:Insulin; D007672:Kidney Cortex / Q000378:metabolism*; D007679:Kidney Medulla / Q000378:metabolism*; D016030:Kidney Transplantation; D009926:Organ Preservation; D019188:Organ Preservation Solutions; D011887:Raffinose; D013552:Swine
chemical_list: D007328:Insulin; D019188:Organ Preservation Solutions; C055206:University of Wisconsin-lactobionate solution; D000493:Allopurinol; D005978:Glutathione; D000241:Adenosine; D011887:Raffinose