Estimation of Pancreas Weight from Donor Variables

Abstract

Previous studies have identified several donor factors affecting the outcome of islet isolation. Pancreas weight has not been considered as a donor selection criterion, because a value cannot be obtained prior to organ procurement. However, a larger pancreas will likely contain a higher number of islets. Therefore, the prediction of pancreas weight would be helpful in donor selection, benefiting cost and efficiency of the islet isolation laboratory. The purpose of this study was to investigate normal pancreas weight in cadaveric donors and identify pancreas weight predictors from demographic data of cadaveric organ donors. We retrospectively analyzed data on pancreas weight from 354 cadaveric donors with respect to gender, age, body weight, body height, body mass index (BMI), and body surface area (BSA). In men, pancreas weight correlated more closely with body weight than with age, height, or BMI. BSA was as strong a correlate of pancreas weight as body weight. In women, pancreas weight had a similar pattern of relationships, with generally lower correlation coefficients. On the basis of the observation of gender-specific pancreas weight difference in elderly donors, stepwise multiple linear regression analyses were conducted separately for younger (≥40 years) and elderly (≤41 years) donors. In younger donors, body weight and age were the major predictors of pancreas weight [pancreas weight (g) = 4.355 + 0.742 × body weight (kg) + 0.837 × age (years) (R2 = 0.564, p < 0.001)]. In contrast, pancreas weight of elderly donors was best predicted by BSA and gender [pancreas weight (g) =-17.624 + 60.036 × BSA (m2) − 7.152 × gender (R2 = 0.372, p< 0.001; “gender”: 1 = female, 0 = male)]. Pancreas weight was found to be positively associated with pre- and postpurification islet yields. These formulae should contribute to the estimation of pancreas weight, and thus improve donor selection for islet isolation and transplantation.