S.E. de Rooij

The DSM-5 criteria, level of arousal and delirium diagnosis: Inclusiveness is safer

Delirium is a common and serious problem among acutely unwell persons. Alhough linked to higher rates of mortality, institutionalisation and dementia, it remains underdiagnosed. Careful consideration of its phenomenology is warranted to improve detection and therefore mitigate some of its clinical impact. The publication of the fifth edition of the Diagnostic and Statistical Manual of the American Psychiatric Association (DSM-5) provides an opportunity to examine the constructs underlying delirium as a clinical entity. Altered consciousness has been regarded as a core feature of delirium; the fact that consciousness itself should be physiologically disrupted due to acute illness attests to its clinical urgency. DSM-5 now operationalises `consciousness’ as `changes in attention’. It should be recognised that attention relates to content of consciousness, but arousal corresponds to level of consciousness. Reduced arousal is also associated with adverse outcomes. Attention and arousal are hierarchically related; level of arousal must be sufficient before attention can be reasonably tested. Our conceptualisation of delirium must extend beyond what can be assessed through cognitive testing (attention) and accept that altered arousal is fundamental. Understanding the DSM-5 criteria explicitly in this way offers the most inclusive and clinically safe interpretation.BackgroundDelirium is a common and serious problem among acutely unwell persons. Alhough linked to higher rates of mortality, institutionalisation and dementia, it remains underdiagnosed. Careful consideration of its phenomenology is warranted to improve detection and therefore mitigate some of its clinical impact. The publication of the fifth edition of the Diagnostic and Statistical Manual of the American Psychiatric Association (DSM-5) provides an opportunity to examine the constructs underlying delirium as a clinical entity.DiscussionAltered consciousness has been regarded as a core feature of delirium; the fact that consciousness itself should be physiologically disrupted due to acute illness attests to its clinical urgency. DSM-5 now operationalises `consciousness’ as `changes in attention’. It should be recognised that attention relates to content of consciousness, but arousal corresponds to level of consciousness. Reduced arousal is also associated with adverse outcomes. Attention and arousal are hierarchically related; level of arousal must be sufficient before attention can be reasonably tested.SummaryOur conceptualisation of delirium must extend beyond what can be assessed through cognitive testing (attention) and accept that altered arousal is fundamental. Understanding the DSM-5 criteria explicitly in this way offers the most inclusive and clinically safe interpretation.

Effectiveness of melatonin treatment on circadian rhythm disturbances in dementia. Are there implications for delirium? : A systematic review

Circadian rhythm disturbances, like sundowning, are seen in dementia. Because the circadian rhythm is regulated by the biological clock, melatonin might be effective in the treatment of these disturbances. We systematically studied the effect of melatonin treatment in patients with dementia. In addition, we elaborate on the possible effects one might expect of melatonin treatment in patients with delirium, since dementia and delirium are strongly related. Moreover, some evidence exists that sundowning in patients with dementia and the alterations in the sleep/wake cycle, seen in patients with delirium both originate from circadian rhythm disturbances.

Consensus and variations in opinions on delirium care: a survey of European delirium specialists

Background: There are still substantial uncertainties over best practice in delirium care. The European Delirium Association (EDA) conducted a survey of its members and other interested parties on various aspects of delirium care. Methods: The invitation to participate in the online survey was distributed among the EDA membership. The survey covered assessment, treatment of hyperactive and hypoactive delirium, and organizational management. Results: A total of 200 responses were collected (United Kingdom 28.6%, Netherlands 25.3%, Italy 15%, Switzerland 9.7%, Germany 7.1%, Spain 3.8%, Portugal 2.5%, Ireland 2.5%, Sweden 0.6%, Denmark 0.6%, Austria 0.6%, and others 3.2%). Most of the responders were doctors (80%), working in geriatrics (45%) or internal medicine (14%). Ninety-two per cent of the responders assessed patients for delirium daily. The most commonly used assessment tools were the Confusion Assessment Method (52%) and the Delirium Observation Screening Scale (30%). The first-line choice in the management of hyperactive delirium was a combination of non-pharmacological and pharmacological approaches (61%). Conversely, non-pharmacological management was the first-line choice in hypoactive delirium (67%). Delirium awareness (34%), knowledge (33%), and lack of education (13%) were the most commonly reported barriers to improving the detection of delirium. Interestingly, 63% of the responders referred patients after an episode of delirium to a follow-up clinic. Conclusions: This is the first systematic survey involving an international group of specialists in delirium. Several areas of lack of consensus were found. These results emphasise the importance of further research to improve care of this major unmet medical need.

Development of an abbreviated version of the delirium motor subtyping scale (DMSS-4)

BACKGROUND Delirium is a common neuropsychiatric syndrome with considerable heterogeneity in clinical profile. Identification of clinical subtypes can allow for more targeted clinical and research efforts. We sought to develop a brief method for clinical subtyping in clinical and research settings. METHODS A multi-site database, including motor symptom assessments conducted in 487 patients from palliative care, adult and old age consultation-liaison psychiatry services was used to document motor activity disturbances as per the Delirium Motor Checklist (DMC). Latent class analysis (LCA) was used to identify the class structure underpinning DMC data and also items for a brief subtyping scale. The concordance of the abbreviated scale was then compared with the original Delirium Motor Subtype Scale (DMSS) in 375 patients having delirium as per the American Psychiatric Associations Diagnostic and Statistical Manual (4th edition) criteria. RESULTS Latent class analysis identified four classes that corresponded closely with the four recognized motor subtypes of delirium. Further, LCA of items (n = 15) that loaded >60% to the model identified four features that reliably identified the classes/subtypes, and these were combined as a brief motor subtyping scale (DMSS-4). There was good concordance for subtype attribution between the original DMSS and the DMSS-4 (κ = 0.63). CONCLUSIONS The DMSS-4 allows for rapid assessment of clinical subtypes in delirium and has high concordance with the longer and well-validated DMSS. More consistent clinical subtyping in delirium can facilitate better delirium management and more focused research effort.

Prevalence of mild cognitive impairment and dementia in older non-western immigrants in the Netherlands: a cross-sectional study

In the Netherlands, persons of Turkish, Moroccan and Surinamese descent form the largest groups of non‐western immigrants. A high prevalence of mild cognitive impairment (MCI) and dementia has been described in immigrant populations in the United States of America and the United Kingdom. We determined the prevalence of MCI and dementia in older community‐dwelling adults from the largest non‐western immigrant groups in the Netherlands.

Changing perspectives on delirium care: The new Dutch guideline on delirium

Both the patients and the caregivers perspectives are discussed. The guideline includes chapters on epidemiology, etiology and risk factors, and the non-pharmacological and pharmacological prevention and treatmentof delirium. Inaddition, onechapter is dedicated to the ‘organization of care’. This latter chapter was more heavily based on expert opinion than the other chapters.

Glucocorticoid Receptor Haplotype is Associated With a Decreased Risk of Delirium in the Elderly

Delirium is the most common mental disorder at older age in hospitals after acute admission. The pathogenesis of delirium is largely unknown. Hyperactivity of the hypothalamic‐pituitary‐adrenal axis, leading to increased cortisol levels, has been suggested to play a role in the development of delirium. The effects of cortisol, the most important glucocorticoid (GC) in humans, are mainly mediated by the GC receptor (GR). Several polymorphisms in the GR gene that alter the GC sensitivity are known. The aim of this study was to study the role of these GR polymorphisms in delirium in elderly patients. Patients aged 65 years and older admitted to the medical department or scheduled for hip surgery were included. Delirium was diagnosed using the Confusion Assessment Method. Five single nucleotide polymorphisms in the GC receptor gene were genotyped and haplotypes were constructed. Delirium was associated with impaired cognitive (P < 0.001) and functional function (P < 0.001), as well as with older age (P < 0.001). Homozygous carriers of haplotype 4, characterized by the presence of the BclI and TthIIII minor alleles, had a 92% decreased risk of developing delirium (P = 0.02), independent of age, cognitive, and functional state. Homozygous carriage of the BclI‐TthIIII haplotype of the GR gene is related to a reduced risk of developing delirium. This suggests that altered GC signaling may be involved in the pathogenesis and development of delirium in the elderly.

A Longitudinal Study of Delirium Motor Subtypes in Elderly Hip Surgery Patients: Frequency and Determinants.

Introduction Delirium is a common neuropsychiatric syndrome with considerable heterogeneity that includes a variety of clinical (motor) subtypes. Because delirium is typically highly fluctuating, understanding the longitudinal stability of subtypes is crucial to evaluating their relevance to treatment and outcome. Aims to examine the changes (variability) in motor subtype profile in patients with delirium over serial assessment using the Delirium Motor Subtype Scale, and to investigate predictors of variability. Methods We studied motor subtype profile of patients with delirium assessed daily over a week in elderly patients undergoing hip fracture surgery. A Generalized Estimating Equations Model examined possible predictors of change in motor subtype status, including baseline variables and delirium course. Results We included 118 patients developing DSM-IV delirium after hip-surgery [mean age 87.0±6.5 years; range 65–102; 66% females]. At first assessment, hyperactive subtype was most common (49%), followed by hypoactive (31%) and mixed subtype (14%), with 6% of delirious patients not fulfilling criteria of any DMSS-defined motor subtype. Almost two-thirds (n=69) of these patients underwent at least one more assessment, and for these 45 (57%) remained stable in motor subtype over time, while the rest 34 (43%) underwent change. A range of baseline characteristics were not significant predictors of variability in subtype profile. Conclusions Motor subtype profile is typically stable for orthopaedic patients with delirium. Thus evidence from cross-sectional studies of motor subtypes can be applied to many patients with delirium. Further longitudinal studies can clarify the stability of motor subtypes across different clinical populations.

Hip fractures in older patients: Trajectories of disability after surgery

BackgroundHip fracture in older patients often lead to permanent disabilities and can result in mortality.ObjectiveTo identify distinct disability trajectories from admission to one-year post-discharge in acutely hospitalized older patients after hip fracture.DesignProspective cohort study, with assessments at admission, three-months and one-year post-discharge.Setting and participantsPatients ≥ 65 years admitted to a 1024-bed tertiary teaching hospital in the Netherlands.MethodsDisability was the primary outcome and measured with the modified Katz ADL-index score. A secondary outcome was mortality. Latent class growth analysis was performed to detect distinct disability trajectories from admission and Cox regression was used to analyze the effect of the deceased patients to one-year after discharge.ResultsThe mean (SD) age of the 267 patients was 84.0 (6.9) years. We identified 3 disability trajectories based on the Katz ADL-index score from admission to one-year post-discharge: ‘mild’- (n=54 (20.2%)), ‘moderate’- (n=110 (41.2%)) and ‘severe’ disability (n=103 (38.6%)). Patients in all three trajectories showed an increase of disabilities at three months, in relation to baseline and 80% did not return to baseline one-year post-discharge. Seventy-three patients (27.3%) deceased within one-year post-discharge, particularly in the ‘moderate’- (n=22 (8.2%)) and ‘severe’ disability trajectory (n=47 (17.6%)).ConclusionsThree disability trajectories were identified from hospital admission until one-year follow-up in acutely hospitalized older patients after hip fracture. Most patients had substantial functional decline and 27% of the patient’s deceased one-year post-discharge, mainly patients in the ‘moderate’- ‘and severe’ disability trajectories.

Psychometric Evaluation of the DMSS-4 in a Cohort of Elderly Post-operative Hip Fracture Patients with Delirium.

Introduction Delirium is a common neuropsychiatric syndrome with considerable heterogeneity in clinical profile. Rapid reliable identification of clinical subtypes can allow for more targeted and research efforts. Aims The aims of this study are to evaluate the concurrent validity (agreement) and reliability (internal consistency) of DMSS-4 in a new cohort of delirious hospitalised patients. Methods We explored the concordance in attribution of motor subtypes between the DMSS-4 and the original DMSS (assessed cross-sectionally) and subtypes defined longitudinally using the Delirium Symptom Interview (DSI) method. Results We included 118 elderly patients developing DSM-IV delirium after hip-surgery [mean age 87.0±6.5 years; range 65–102; 66% females; 28 (23.7%) had no previous history of cognitive impairment]. Concordance was high for both the DMSS-4 and original DMSS (k=0.80), and for the DMSS-4 and DSI methods (k=0.82). The DMSS-4 also demonstrated high internal consistency (McDonalds omega = 0.78). The DMSS-11 and DMSS-4 had higher inclusion for motor subtypes than the DSI method. Conclusions The DMSS-4 provides an ultra-rapid means of identifying motor-defined clinical subtypes of delirium and is a reliable alternative to the more detailed and time-consuming original DMSS and DSI methods of subtype attribution. The DMSS-4 can be readily applied to further studies of causation, treatment and outcome in delirium.