Delirium in a Latin American intensive care unit. A prospective cohort study of mechanically ventilated patients

Development and internal verification of nomogram for forecasting delirium in the elderly admitted to intensive care units: an analysis of MIMIC-IV database

Background

Precise forecasting of delirium in intensive care unit (ICU) may propel effective early prevention strategies and stratification of ICU patients through delirium risks, avoiding waste of medical resources. However, there are few optimal models of delirium in critically ill older patients. This study aimed to propose and verify a nomogram for predicting the incidence of delirium in elderly patients admitted to ICU.

Methods

We performed a retrospective study using data from the Medical Information Mart for Intensive Care IV (MIMIC-IV) database. It included data on 13,175 older patients in total. The patients were randomly divided into a training group (n = 9,223) and an internal verification group (n = 3,452). Risk factors were screened using the least absolute shrinkage and selection operator regression. We successfully constructed a multivariate logistic regression model along with a nomogram. We conducted internal verification using 1,000 bootstrap specimens. Performance assessment was conducted using a receiver operating characteristic (ROC) curve, calibration curve, decision curve analysis (DCA), and clinical impact curve (CIC).

Results

The risk factors included in the nomogram were sepsis, Sequential Organ Failure Assessment (SOFA) score, cerebrovascular disease, mechanical ventilation, sedation, severe hypothermia, and serum calcium levels. The area under the ROC curve (AUC) for the nomogram, incorporating the above-mentioned predictors for the training set was 0.762 (95% confidence interval [CI] 0.749-0.776), whereas that for the verification set was 0.756 (95% CI 0.736-0.776). Based on the calibration curve, the model forecast outcomes matched well with the actual results, and the nomogram's Brier score was 0.12 in the training set and 0.128 in the verification set. DCA and CIC showed that our model had a good net clinical benefit.

Conclusion

We developed a forecast nomogram for delirium in the critically ill elderly patients that enhances clinical decision-making. However, further verification is required.

Delirium as a Determinant of Long-Term Cognitive Dysfunction in the Context of Post-intensive Care Syndrome: A Prospective Study in a Latin American Environment

Introduction Cognitive dysfunction represents a major healthcare concern in the 21st century. Prolonged cognitive dysfunction and concomitant psychological and physical disorders in patients admitted to the intensive care unit (ICU) are components of the post-ICU syndrome (PICS). Notwithstanding the numerous published studies in this area, our work is the first to explore the relationship between PICS and delirium in the ICU in Uruguay. This research underscores the significance and potential of our study, which we believe will make a substantial contribution to this field of research in Latin America. Objectives The incidence rates of the cognitive, psychological, and physical sequelae constituting PICS were evaluated, and the relationships between these disorders and delirium in the ICU were studied. Methods This was a prospective cohort study in which patients were followed up for one year after admission to the ICU of Hospital Pasteur between 03/01/2017 and 05/31/2017. The pre-ICU condition of each patient was considered in the analysis. An initial telephone interview was conducted using the following scales: the Hamilton scale was used to assess anxiety, the Pfeiffer scale was used to assess cognitive impairment, and the Barthel scale was used to assess activities of daily living (ADLs). In a second face-to-face interview, the Mini-Mental State Examination (MMSE) and the Beck Depression Scale II (BDS-II) were used. Results Forty-three patients were divided into two groups: 15 (34%) with delirium in the ICU and 28 (66%) without delirium. The association of delirium with different sequelae was evaluated using the corresponding scales: Pfeiffer scale: Cognitive impairment was observed in 7/13 patients (53%) in the delirium group vs. 0/29 patients (0%) in the non-delirious group (p 0.001); MMSE score: Deterioration was observed in 6/7 patients (86%) in the delirium group vs. 1/7 patients (14%) in the non-delirious group (p 0.007). Cognitive impairment was found in 3/6 patients (50%) who presented with delirium in the ICU, while 1/8 patients (13%) who did not present with delirium experienced cognitive impairment (p = 0.036); Hamilton scale: Anxiety was found in 8/15 patients (57%) in the delirium group and 20/29 patients (68%) in the non-delirious group; BDS-II: Depression was found in 12/12 patients (100%) in the delirium group vs. 27/29 patients (93%) in the non-delirious group (p 0.57). Barthel scale: Dependence on others for ADLs was observed in 3/15 patients (20%) in the delirium group vs. 4/29 patients (14%) in the non-delirious group (p = 0.23). Conclusions Cognitive impairment was observed to be associated with delirium in the ICU, opening new avenues for research and possible treatment options. Although dependence on activities of daily living (ADLs) was more common in the delirium group, the difference between the two groups was not significant, highlighting the need for further research to understand the whole picture. Rates of anxiety and depression after ICU stay were also similar between the two groups, providing a baseline for comparison and informing future studies. The study highlights the urgent need for delirium-specific interventions in the ICU to address cognitive dysfunction and improve long-term outcomes in critically ill patients.

Delirium in the ICU: how much do we know? A narrative review

Delirium in critical ill patients is a complex and common neurological syndrome in the intensive care unit (ICU) that is caused by a range of structural or functional abnormalities. ICU Delirium is associated with reduced compliance, prolonged hospital stays, greater use or delayed withdrawal of sedatives, higher rates and durations of mechanical ventilation, and higher rates of mortality. The aetiology and pathogenesis of ICU delirium are unclear, and the lack of better prediction, prevention, and treatment measures leads to a non-standardized control of delirium. By searching the relevant literature, we aim in this narrative review to describe progress in the pathogenesis, predictive biomarkers, diagnosis, and treatment of ICU delirium.

Prevention and treatment of delirium in intensive care: Hermeneutics of experiences of the nursing team

OBJECTIVE

To understand the experiences in nursing care in the prevention and treatment of delirium in people hospitalized in intensive care units.

METHODOLOGY

Hermeneutic phenomenological qualitative study. The selection of participants was by intentional sampling: seven nursing assistants and eight nurses. Theoretical saturation was achieved. The phenomenological interview was applied to collect data from a central question and the analysis was carried out following the approaches of Heidegger's hermeneutical circle.

RESULTS

Four significant themes emerged from the analysis: (1) delirium prevention, (2) pharmacological treatment, (3) non-pharmacological treatment, and (4) barriers to non-pharmacological treatment. These themes were accompanied by 35 interrelated units of meaning: in the first theme, the most repetitive units were communication, orientation, and family bonding; in the second was the use of pharmacological treatment only in the acute phase; in the third was the modification of the environment according to the patient's preference (where the family is a priority and strategies that provide cognitive and social stimulation can be reinforced), and in the fourth was the work overload for the nursing team.

CONCLUSIONS

The experiences of the nursing team in the prevention and treatment of delirium in critically ill patients highlight that communication allows an approach to the patient as a human being immersed in a reality, with a personal history, needs and preferences. Therefore, family members must be involved in these scenarios, as they can complement and support nursing care.

The family in preventing delirium in the intensive care unit: Scoping review

INTRODUCTION

Delirium is cognitive impairment related to negative inpatient outcomes in the Intensive Care Unit (ICU), family interventions have been shown to be effective in reducing the incidence of this condition.

OBJECTIVE

To identify strategies that include the family in the prevention of delirium in the adult intensive care unit that can be integrated into ABCDEF.

INCLUSION CRITERIA

Studies describing actions and interventions involving caregivers and family members in the ICU for the prevention of delirium, conducted in the last five years, available in full text, in English and Spanish, Portuguese and in adults.

METHODS

A scope review was conducted using the keywords "Critical Care, Delirium, Family, Primary Prevention" in 11 databases (PubMed, Virtual Health Library, Cochrane Library, TRIP Data base, EBSCO, Ovid Nursing, Springer, Scopus, Dialnet, Scielo, Lilacs) and other sources (Open Gray, Google Scholar), between August - October 2019; 8 studies were considered relevant and were analysed.

RESULTS

The results were described in 3 categories: flexibility vs. restriction of visits in the ICU, Reorientation as a prevention strategy and post-ICU syndrome in the family.

CONCLUSION

Extended visits, development of family-mediated activities, and redirection are non-pharmacological strategies that reduce the incidence of delirium in the ICU and offer multiple benefits to the patient and family/caregiver.

Prevention and treatment of delirium in intensive care: Hermeneutics of experiences of the nursing team

OBJECTIVE

To understand the experiences in nursing care in the prevention and treatment of delirium in people hospitalized in intensive care units.

METHODOLOGY

Hermeneutic phenomenological qualitative study. The selection of participants was by intentional sampling: seven nursing assistants and eight nurses. Theoretical saturation was achieved. The phenomenological interview was applied to collect data from a central question and the analysis was carried out following the approaches of Heidegger's hermeneutical circle.

RESULTS

Four significant themes emerged from the analysis: 1) Delirium prevention, 2) Pharmacological treatment, 3) Non-pharmacological treatment, and 4) Barriers to non-pharmacological treatment. These themes were accompanied by 35 interrelated units of meaning: in the first theme, the most repetitive units were communication, orientation, and family bonding; in the second was the use of pharmacological treatment only in the acute phase; in the third was the modification of the environment according to the patient's preference (where the family is a priority and strategies that provide cognitive and social stimulation can be reinforced), and in the fourth was the work overload for the nursing team.

CONCLUSIONS

The experiences of the nursing team in the prevention and treatment of delirium in critically ill patients highlight that communication allows an approach to the patient as a human being immersed in a reality, with a personal history, needs and preferences. Therefore, family members must be involved in these scenarios, as they can complement and support nursing care.

The family in preventing delirium in the intensive care unit: Scoping review

INTRODUCTION

Delirium is cognitive impairment related to negative inpatient outcomes in the Intensive Care Unit (ICU), family interventions have been shown to be effective in reducing the incidence of this condition.

OBJECTIVE

To identify strategies that include the family in the prevention of delirium in the adult intensive care unit that can be integrated into ABCDEF.

INCLUSION CRITERIA

Studies describing actions and interventions involving caregivers and family members in the ICU for the prevention of delirium, conducted in the last five years, available in full text, in English and Spanish, Portuguese and in adults.

METHODS

A scope review was conducted using the keywords "Critical Care, Delirium, Family, Primary Prevention" in 11 databases (PubMed, Virtual Health Library, Cochrane Library, TRIP Data base, EBSCO, Ovid Nursing, Springer, Scopus, Dialnet, Scielo, Lilacs) and other sources (Open Gray, Google Scholar), between August - October 2019; 8 studies were considered relevant and were analysed.

RESULTS

The results were described in 3 categories: flexibility vs. restriction of visits in the ICU, Reorientation as a prevention strategy and post-ICU syndrome in the family.

CONCLUSION

Extended visits, development of family-mediated activities, and redirection are non-pharmacological strategies that reduce the incidence of delirium in the ICU and offer multiple benefits to the patient and family/caregiver.

Systematic review of cognitive impairment and brain insult after mechanical ventilation

We conducted a systematic review following the PRISMA protocol primarily to identify publications that assessed any links between mechanical ventilation (MV) and either cognitive impairment or brain insult, independent of underlying medical conditions. Secondary objectives were to identify possible gaps in the literature that can be used to inform future studies and move toward a better understanding of this complex problem. The preclinical literature suggests that MV is associated with neuroinflammation, cognitive impairment, and brain insult, reporting higher neuroinflammatory markers, greater evidence of brain injury markers, and lower cognitive scores in subjects that were ventilated longer, compared to those ventilated less, and to never-ventilated subjects. The clinical literature suggests an association between MV and delirium, and that delirium in mechanically ventilated patients may be associated with greater likelihood of long-term cognitive impairment; our systematic review found no clinical study that demonstrated a causal link between MV, cognitive dysfunction, and brain insult. More studies should be designed to investigate ventilation-induced brain injury pathways as well as any causative linkage between MV, cognitive impairment, and brain insult.

Analysis of Delirium From the Dynamic Symptoms Model: A Literature Review

Delirium is a manifestation of brain injury or acute and generalized dysfunction of the upper cerebral cortical processes. In this way, it is important to analyze delirium more broadly as a symptom to understand and intervene taking into account that it is manifesting the presence of brain lesions whose consequences are deleterious to the neurological performance of patients. This article is intended to present a comprehensive approach of delirium analyzed from a symptom perspective and from theoretical and conceptual structure, such as the Dynamic Symptoms Model, specific to the nursing practice. A literature review related to delirium and components of Dynamic Symptoms Model was carried out. We searched the MEDLINE, ScienceDirect, SciELO, and Scopus databases using the terms Delirium, Intensive Care Units, Nursing, and Risk Factor. The existing literature provides evidence of the antecedents, experience, interventions, interactions, and consequences of delirium, which are components of the Model. Thus, the analysis from the Dynamic Symptoms Model perspective bears relevance and contributes to the understanding and approach of delirium.

Delirium in older adults

This narrative review provides a broad examination of the most current concepts on the etiopathogenesis, diagnosis, prevention, and treatment of delirium, an acute neuropsychiatric syndrome characterized by fluctuating changes in cognition and consciousness. With the interaction of underlying vulnerability and severity of acute insults, delirium can occur at any age but is particularly frequent in hospitalized older adults. Delirium is also associated with numerous adverse outcomes, including functional impairment, cognitive decline, increased healthcare costs, and death. Its diagnosis is based on clinical and cognitive assessments, preferably following systematized detection instruments, such as the Confusion Assessment Method (CAM). Delirium and its consequences are most effectively fought using multicomponent preventive interventions, like those proposed by the Hospital Elder Life Program (HELP). When prevention fails, delirium management is primarily based on the identification and reversal of precipitating factors and the non-pharmacological control of delirium symptoms. Pharmacological interventions in delirium should be restricted to cases of dangerous agitation or severe psychotic symptoms.

Prevalence of delirium in intensive care patients and association with sedoanalgesia, severity and mortality

OBJECTIVE

To establish the prevalence of delirium and its subsyndrome in intensive care and to associate it with the use of sedative and analgesia, severity and mortality.

METHOD

Carried out in two intensive care units of adult patients, this is a quantitative and transversal study, with 157 patients, using the Richmond Agitation-Sedation Scale to assess the level of sedation and the Intensive Care Delirium Screening Checklist for delirium. The T test and Chi-square test were applied for statistical analysis.

RESULTS

The prevalence of delirium was 22.3%, and 49.7% of the subsyndrome. Associations of the use of midazolam with the presence of delirium (p=0.05) and subsyndromal delirium (p<0.01), use of clonidine with the appearance of delirium (p<0.01) and of fentanyl with subsyndromal delirium (p=0.09). There were no significant differences between the mortality of patients with delirium (p=0.40) and subsyndromal delirium (p=0.86), as well as association with the mortality score.

CONCLUSION

The use of sedoanalgesia is associated with the presence of delirium and subsyndromal delirium. No significant statistical associations were found between the severity and mortality scores.

Assessment of delirium using the PRE-DELIRIC model in an intensive care unit in Argentina

OBJECTIVE

To describe the incidence of and risk factors for delirium in the intensive care unit of a tertiary care teaching hospital in Argentina and to conduct the first non-European study exploring the performance of the PREdiction of DELIRium in ICu patients (PRE-DELIRIC) model.

METHODS

Prospective observational study in a 20-bed intensive care unit of a tertiary care teaching hospital in Buenos Aires, Argentina. The PRE-DELIRIC model was applied to 178 consecutive patients within 24 hours of admission to the intensive care unit; delirium was assessed with the Confusion Assessment Method for the Intensive Care Unit (CAM-ICU).

RESULTS

The mean age was 64.3 ± 17.9 years. The median time of stay in the intensive care unit was 6 (range, 2 - 56) days. Of the total number of patients, 49/178 (27.5%) developed delirium, defined as a positive CAM-ICU assessment, during their stay in the intensive care unit. Patients in the delirium group were significantly older and had a significantly higher Acute Physiological and Chronic Health Evaluation II (APACHE II) score. The mortality rate in the intensive care unit was 14.6%; no significant difference was observed between the two groups. Predictive factors for the development of delirium were increased age, prolonged intensive care unit stay, and opioid use. The area under the curve for the PRE-DELIRIC model was 0.83 (95%CI; 0.77 - 0.90).

CONCLUSIONS

The observed incidence of delirium highlights the importance of this problem in the intensive care unit setting. In this first study conducted outside Europe, PRE-DELIRIC accurately predicted the development of delirium.