Organ shortage remains a significant challenge in transplantology, prompting efforts to maximize the use of available organs and expand the donor pool, including through extended criteria donors (ECDs). However, ECD kidney recipients often face poorer outcomes, including a higher incidence of delayed graft function (DGF), which is linked to worse graft performance, reduced long-term survival, and an increased need for interventions like dialysis. This underscores the urgent need for strategies to improve early DGF risk assessment and optimize post-transplant management for high-risk patients. This study conducted multi-time point metabolomic and lipidomic analyses of donor kidney tissue and recipient plasma to identify compounds predicting DGF risk and assess the translational potential of solid-phase microextraction (SPME) for graft evaluation and early complication detection. The SPME-based chemical biopsy enabled a direct kidney analysis, while thin-film microextraction facilitated high-throughput plasma preparation. Following high-performance liquid chromatography coupled with a mass spectrometry analysis, the random forest algorithm was applied to identify compounds with predictive potential for assessing DGF risk before transplantation. Additionally, a comparison of metabolomic and lipidomic profiles of recipient plasma during the early post-operative days identified metabolites that distinguish between DGF and non-DGF patients. The selected compounds primarily included amino acids and their derivatives, nucleotides, organic acids, peptides, and lipids, particularly phospholipids and triacylglycerols. In conclusion, this study highlights the significant translational potential of chemical biopsies and plasma metabolite analyses for risk assessments and the non-invasive monitoring of DGF. The identified metabolites provide a foundation for developing a comprehensive DGF assessment and monitoring method, with potential integration into routine clinical practice.

The purpose of this article is to present the most important rules of the interview process with the family of a patient who has been diagnosed with brain death. Based on data from the literature and their own clinical experience, the authors also describe the psychological mechanisms that make contact with the family of a potential donor particularly difficult. The paper also discusses successive stages in the process of building contact with the family from the perspective of the dual advocacy approach that, in the light of recent data from the literature, can significantly increase the likelihood of the family's acceptance of organ donation, offering both the specific theoretical foundations as well as the strict principles in regard to the interview. The article contains practical suggestions for dealing with difficulties that can arise at all stages of contact with the family: making contact, providing information, providing information about brain death and talking with the family about organ donation from a deceased relative.