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INTRODUCTION: Australian organ and tissue donation rates are low compared to other countries. Acknowledging that donation practices vary across Australia, the Australian College of Critical Care Nurses supported the development of a position statement to explicate critical care nurses' role in supporting organ and tissue donation. Several Australian peak professional organisations provide guidance to inform and support organ and tissue donation. AIM: The aim of this study was to develop a position statement using contemporary Australian research evidence to build upon and complement existing guidance, focussing on the role of critical care nurses in organ and tissue donation in Australian critical care. METHOD: An approach similar to a rapid review was used, providing a streamlined approach to synthesising evidence. A comprehensive search using Medical Subject Headings, keywords, and synonyms was undertaken using Medline and CINAHL Complete via EBSCOhost to identify peer-reviewed Australian research evidence about critical care nurses' role, obligations, expectations, and scope of practice during organ and tissue donation. Narrative synthesis was used to synthesise the research evidence. FINDINGS: The importance of separating death from organ donation in discussions with family, the timing and the approach to organ donation conversations, and working in collaboration with the DonateLife Donation Specialist Nurses were identified. The importance of understanding family perspectives, caring for families, and collegial support for critical care clinicians were also identified. With the guidance of peak professional organisations, the research evidence was then used to develop practice recommendations for critical care units, leaders, and critical care nurses. DISCUSSION AND CONCLUSION: The recommendations explicate the important contribution critical care nurses can make to ensuring timely, sensitive communication, providing high-quality end-of-life care, supporting families irrespective of the donation decision and supporting colleagues from the wider critical care team, thereby optimising the processes related to organ and tissue donation in Australian critical care settings.
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We examine structural brain characteristics across three diagnostic categories: at risk for serious mental illness; first-presenting episode and recurrent major depressive disorder (MDD). We investigate whether the three diagnostic groups display a stepwise pattern of brain changes in the cortico-limbic regions. Integrated clinical and neuroimaging data from three large Canadian studies were pooled (total n = 622 participants, aged 12-66 years). Four clinical profiles were used in the classification of a clinical staging model: healthy comparison individuals with no history of depression (HC, n = 240), individuals at high risk for serious mental illness due to the presence of subclinical symptoms (SC, n = 80), first-episode depression (FD, n = 82), and participants with recurrent MDD in a current major depressive episode (RD, n = 220). Whole-brain volumetric measurements were extracted with FreeSurfer 7.1 and examined using three different types of analyses. Hippocampal volume decrease and cortico-limbic thinning were the most informative features for the RD vs HC comparisons. FD vs HC revealed that FD participants were characterized by a focal decrease in cortical thickness and global enlargement in amygdala volumes. Greater total amygdala volumes were significantly associated with earlier onset of illness in the FD but not the RD group. We did not confirm the construct validity of a tested clinical staging model, as a differential pattern of brain alterations was identified across the three diagnostic groups that did not parallel a stepwise clinical staging approach. The pathological processes during early stages of the illness may fundamentally differ from those that occur at later stages with clinical progression.