Development and modelling study of an evidence-based manualised intervention: PErsonalised Treatment packages for Adults with Learning disabilities who display aggressive challenging behaviour in community settings (PETAL)

<ns3:p>Background Aggressive challenging behaviour is prevalent in adults with an intellectual disability and is associated with over-medication, physical ill-health and psychiatric hospitalisation. We urgently need interventions that can moderate this behaviour and improve quality of life in this population. We report on the development and modelling of a 7-module tailored manualised psychological intervention to support adults who display aggressive challenging behaviour in community settings (hence referred to as the PETAL therapy). Method The PETAL therapy was designed following an extensive review of existing management provisions and was co-produced with carers with lived experience and self-advocates with an intellectual disability. A logic model was developed to illustrate the theoretical approach behind the development of the PETAL intervention. A single arm multi-site modelling study was conducted in England to test the delivery and acceptability of the PETAL intervention. Seventeen NHS healthcare professionals were trained during a two-day training programme and were regularly supervised to deliver the therapy in up to 14 weeks. Following completion, we conducted qualitative interviews with stakeholders and explored the intervention’s fidelity and acceptability. Results We held seven co-production meetings and developed the PETAL therapy, consisting of the following modules: Getting to know the person, understanding aggressive challenging behaviour, communication, emotions, a calm environment, carer wellbeing and healthy habits. We then recruited ten dyads or triads (person with a learning disability and 1–2 carers) to participate in a modelling study to test delivery aspects and measure fidelity. Nineteen stakeholders were interviewed, and the findings were analysed deductively using Normalisation Process Theory and its four domains: coherence, cognitive participation, collective action and reflexive monitoring. Conclusion The PETAL therapy was possible to deliver in community services with high fidelity and was acceptable. The PETAL manual and training programme have been reviewed and refined and a cluster randomised controlled trial is underway.</ns3:p>