Non-Retrieval and Non-Utilisation of Deceased Donor Kidneys for Transplantation: An Australian Cohort Study.

BACKGROUND

An efficient organ donation programme must maximise transplantation following initiation of organ recovery procedures.

METHODS

We conducted a cohort study of deceased donors in Australia (2014-2021) using Australia and New Zealand Organ Donation Registry data to characterise kidney non-retrieval (post-incision) and non-utilisation (retrieved, not transplanted). Donor characteristics included kidney side (left/right), kidney-only procurement, kidney donor profile index (KDPI), cause of death, resuscitation, donation after circulatory/neurological determination of death (DCDD/DNDD) and donor criteria (standard SCD/extended ECD), year, age, sex, blood group, ethnicity, comorbidities, smoking, BMI, weight, remoteness, occupation and socioeconomic disadvantage. System characteristics included jurisdiction of donor hospital, retrieval team and recipient's hospital.

RESULTS

Among 7211 kidneys (3683 donors) accepted for retrieval, 675 (9%) were non-retrieved and 430 (7%) were non-utilised. Crude non-retrieval rates doubled from 5% to 10% between 2014 and 2021 (p = 0.01) while non-utilisation remained around 7% (p = 0.1). After adjustment, non-retrieval was greater among donors with KDPI ≥ 75 (OR: 4.28, 95% CI: 2.08-8.81, p < 0.001), diabetes (OR: 1.74, 95% CI: 1.25-2.43, p = 0.001) and in recent years (annual OR: 1.08, 95% CI: 1.03-1.55, p = 0.002), and lower for ECD DCDD (OR: 0.46, 95% CI: 0.26-0.81, p = 0.01). Non-utilisation was greater for SCD DCDD (OR: 1.90, 95% CI: 1.28-2.82, p < 0.001), blood group AB (OR: 2.05, 95% CI: 1.16-3.64, p = 0.03) and in recent years (annual OR: 1.08, 95% CI: 1.02-1.15, p = 0.01), and lower in Tasmania (OR: 0.28, 95% CI: 0.08-0.97) and Queensland (OR: 0.57, 95% CI: 0.36-0.92, p = 0.03). Documented reasons for non-utilisation lacked transparency but included poor perfusion (17%).

CONCLUSION

Increasing utilisation of higher KDPI kidneys and enhancing perfusion could help maximise kidney transplantation.