A national survey of current practice on patients with long term and additional needs in paediatric intensive care units.

BACKGROUND: Patients with long term and additional needs (LEAP) in paediatric intensive care units (PICUs) are a growing and heterogenous cohort that provide unique challenges to clinicians. Currently no standard approach to define and manage this cohort exists. AIM: To analyse bed occupancy, examine current practice, and explore ideas to improve PICU care of patients with long term and additional needs. STUDY DESIGN: Patients with LEAP were defined as meeting two or more of the following criteria: length of stay >14 days; life limiting condition; ≥2 failed extubations; hospital stay >1 month prior to PICU admission; likely to require long-term ventilation. An electronic survey was then sent to all UK PICUs, via the UK Paediatric Critical Care Society, to collect quantitative and qualitative data relating to bed occupancy, length of stay, multidisciplinary and family involvement, and areas of possible improvement. Data collection were occurred between 8 February 2022 and 14 March 2022. Quantitative data were analysed using Microsoft Excel 365 and SPSS Statistics version 28.0. Raw data and descriptive statistics were reported, including percentages and median with interquartile range for non-parametric data. Qualitative raw data were examined using thematic analysis. Analysis was undertaken independently by two authors and results assessed for concordance. RESULTS: 70.1% (17/24) PICUs responded. 25% (67/259) of PICU beds were occupied by patients with long term and additional needs. 29% (5/17) of responding units have tailored management plans to this cohort of patient. A further 11% (2/17) have guidelines for children with generic chronic illness. 12% (2/16) of responding units had a designated area and 81% (13/16) of responding units had designated professionals. The majority (68% and 62%) of responding units engaged families and community professionals in multidisciplinary meetings. When asked how the care of long term and additional needs patients might be improved five themes were identified: consistent, streamlined care pathways; designated transitional care units; designated funding and hospital-to-home commissioning; development of roles to facilitate collaboration between hospital and community teams; proactive discharge planning and parallel planning. CONCLUSIONS: This survey provides a snapshot of UK practice for a cohort of patients that occupies a considerable proportion (29%) of PICU beds. While only a minority of responding PICUs offer specifically tailored management plans, the majority of units have designated professionals. RELEVANCE TO CLINICAL PRACTICE: Opportunities exist to improve PICU care in LEAP patients in areas such as: streamlined care pathways, designated clinical areas, designated funding, and development of defined collaborative roles. Next steps may involve working group convention to develop a consensus definition and share good practice examples.

Development and function of human cerebral cortex neural networks from pluripotent stem cells in vitro.

A key aspect of nervous system development, including that of the cerebral cortex, is the formation of higher-order neural networks. Developing neural networks undergo several phases with distinct activity patterns in vivo, which are thought to prune and fine-tune network connectivity. We report here that human pluripotent stem cell (hPSC)-derived cerebral cortex neurons form large-scale networks that reflect those found in the developing cerebral cortex in vivo. Synchronised oscillatory networks develop in a highly stereotyped pattern over several weeks in culture. An initial phase of increasing frequency of oscillations is followed by a phase of decreasing frequency, before giving rise to non-synchronous, ordered activity patterns. hPSC-derived cortical neural networks are excitatory, driven by activation of AMPA- and NMDA-type glutamate receptors, and can undergo NMDA-receptor-mediated plasticity. Investigating single neuron connectivity within PSC-derived cultures, using rabies-based trans-synaptic tracing, we found two broad classes of neuronal connectivity: most neurons have small numbers (<10) of presynaptic inputs, whereas a small set of hub-like neurons have large numbers of synaptic connections (>40). These data demonstrate that the formation of hPSC-derived cortical networks mimics in vivo cortical network development and function, demonstrating the utility of in vitro systems for mechanistic studies of human forebrain neural network biology.