TY - JOUR
T1 - The Maryland Aggregate Pathology Index
T2 - A deceased donor kidney biopsy scoring system for predicting graft failure
AU - Munivenkatappa, R. B.
AU - Schweitzer, E. J.
AU - Papadimitriou, J. C.
AU - Drachenberg, C. B.
AU - Thom, K. A.
AU - Perencevich, E. N.
AU - Haririan, A.
AU - Rasetto, F.
AU - Cooper, M.
AU - Campos, L.
AU - Barth, R. N.
AU - Bartlett, S. T.
AU - Philosophe, B.
PY - 2008/11
Y1 - 2008/11
N2 - Despite the common use of diagnostic pretransplant deceased donor kidney biopsy, there is no consensus on the prognostic significance of the pathologic findings. In order to assist clinicians with interpretation we analyzed 371 pretransplant biopsies and correlated the findings with graft failure. Glomerular pathology was assessed with percent glomerulosclerosis (GS), glomerular size and periglomerular fibrosis (PGF); vascular pathology with arterial wall-to-lumen ratio (WLR) and arteriolar hyalinosis and interstitial pathology with measurement of cumulative fibrosis and presence of scar. Using two-thirds of the study population as a model-development cohort, we found that biopsy features independently associated with an increased risk of graft failure were GS ≥15%, interlobular arterial WLR ≥0.5 and the presence of PGF, arteriolar hyalinosis or scar. The Maryland Aggregate Pathology Index (MAPI), was developed from these parameters and validated on the remaining one-third of the population. Five-year actuarial graft survival was 90% for kidneys with MAPI scores between 0 and 7, 63% for scores from 8 to 11 and 53% for scores from 12 to 15 (p < 0.001). We conclude MAPI may help transplant physicians estimate graft survival from the preimplantation biopsy findings, in clinical situations similar to this study population (cold ischemia over 24 h, GS < 25%).
AB - Despite the common use of diagnostic pretransplant deceased donor kidney biopsy, there is no consensus on the prognostic significance of the pathologic findings. In order to assist clinicians with interpretation we analyzed 371 pretransplant biopsies and correlated the findings with graft failure. Glomerular pathology was assessed with percent glomerulosclerosis (GS), glomerular size and periglomerular fibrosis (PGF); vascular pathology with arterial wall-to-lumen ratio (WLR) and arteriolar hyalinosis and interstitial pathology with measurement of cumulative fibrosis and presence of scar. Using two-thirds of the study population as a model-development cohort, we found that biopsy features independently associated with an increased risk of graft failure were GS ≥15%, interlobular arterial WLR ≥0.5 and the presence of PGF, arteriolar hyalinosis or scar. The Maryland Aggregate Pathology Index (MAPI), was developed from these parameters and validated on the remaining one-third of the population. Five-year actuarial graft survival was 90% for kidneys with MAPI scores between 0 and 7, 63% for scores from 8 to 11 and 53% for scores from 12 to 15 (p < 0.001). We conclude MAPI may help transplant physicians estimate graft survival from the preimplantation biopsy findings, in clinical situations similar to this study population (cold ischemia over 24 h, GS < 25%).
KW - Deceased donor kidneys
KW - Graft survival
KW - Scoring system
UR - http://www.scopus.com/inward/record.url?scp=53749087549&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=53749087549&partnerID=8YFLogxK
U2 - 10.1111/j.1600-6143.2008.02370.x
DO - 10.1111/j.1600-6143.2008.02370.x
M3 - Article
C2 - 18801024
AN - SCOPUS:53749087549
SN - 1600-6135
VL - 8
SP - 2316
EP - 2324
JO - American Journal of Transplantation
JF - American Journal of Transplantation
IS - 11
ER -