• D Meagher, N O'Regan, D Ryan, W Connolly, E Boland, R O'Caoimhe, J Clare, J Mcfarland, S Tighe, M Leonard, D Adamis, P T Trzepacz, and S Timmons.
• D. Meagher, MD, PhD, MRCPsych, Foundation Chair of Psychiatry, Head of Teaching and Research in Psychiatry, University of Limerick Medical School, Limerick, Director of the Cognitive Impairment Research Group, Centre for Interventions in Infection, Inflammation & Immunity (4i), Graduate Entry Medical School, University of Limerick and Department of Psychiatry, University Hospital Limerick, Ireland; N. O'Regan, MRCPI, D. Ryan, MRCPI, W. Connolly, MB, E. Boland, MB, R. O'Caoimhe, MB, J. Clare, MRCP, Centre for Gerontology and Rehabilitation, St Finbarr's Hospital, Cork, Ireland; J. Mcfarland, MD, MRCPsych, S. Tighe, MRCPsych, University of Limerick Medical School, Limerick and Clare-Limerick Mental Health Services, HSE-West, Mental Health Services, Ireland; M. Leonard, MD, MRCPsych, University of Limerick Medical School, Limerick and Cognitive Impairment Research Group, Centre for Interventions in Infection, Inflammation & Immunity (4i), Graduate Entry Medical School, University of Limerick, Ireland; D. Adamis, MD, MRCPsych, University of Limerick Medical School, Limerick, Cognitive Impairment Research Group, Centre for Interventions in Infection, Inflammation & Immunity (4i), Graduate Entry Medical School, University of Limerick, Ireland, Sligo-Leitrim Mental Health Services, Sligo, Ireland, and Research and Academic Institute of Athens, Athens, Greece; P. T. Trzepacz, MD, Lilly Research Laboratories, Indianapolis, Indiana, University of Mississippi Medical School, Jackson, Tufts University School of Medicine, Massachusetts and Indiana University School of Medicine, Indiana, USA; S. Timmons, MD, MRCPI, Centre for Gerontology and Rehabilitation, St Finbarr's Hospital, Cork, Ireland.
• Br J Psychiatry. 2014 Dec 1;205(6):478-85.

AbstractBackground The frequency of full syndromal and subsyndromal delirium is understudied. Aims We conducted a point prevalence study in a general hospital. Method Possible delirium identified by testing for inattention was evaluated regarding delirium status (full/subsyndromal delirium) using categorical (Confusion Assessment Method (CAM), DSM-IV) and dimensional (Delirium Rating Scale-Revised-98 (DRS-R98) scores) methods. Results In total 162 of 311 patients (52%) screened positive for inattention. Delirium was diagnosed in 55 patients (17.7%) using DSM-IV, 52 (16.7%) using CAM and 58 (18.6%) using DRS-R98⩾12 with concordance for 38 (12.2%) individuals. Subsyndromal delirium was identified in 24 patients (7.7%) using a DRS-R98 score of 7-11 and 41 (13.2%) using 2/4 CAM criteria. Subsyndromal delirium with inattention (v. without) had greater disturbance of multiple delirium symptoms. Conclusions The point prevalence of delirium and subsyndromal delirium was 25%. There was modest concordance between DRS-R98, DSM-IV and CAM delirium diagnoses. Inattention should be central to subsyndromal delirium definitions.Royal College of Psychiatrists.

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