Catherine L. Hough

Association Between Acute Care and Critical Illness Hospitalization and Cognitive Function in Older Adults

CONTEXT Studies suggest that many survivors of critical illness experience long-term cognitive impairment but have not included premorbid measures of cognitive functioning and have not evaluated risk for dementia associated with critical illness. OBJECTIVES To determine whether decline in cognitive function was greater among older individuals who experienced acute care or critical illness hospitalizations relative to those not hospitalized and to determine whether the risk for incident dementia differed by these exposures. DESIGN, SETTING, AND PARTICIPANTS Analysis of data from a prospective cohort study from 1994 through 2007 comprising 2929 individuals 65 years old and older without dementia at baseline residing in the community in the Seattle area and belonging to the Group Health Cooperative. Participants with 2 or more study visits were included, and those who had a hospitalization for a diagnosis of primary brain injury were censored at the time of hospitalization. Individuals were screened with the Cognitive Abilities Screening Instrument (CASI) (score range, 0-100) every 2 years at follow-up visits, and those with a score less than 86 underwent a clinical examination for dementia. MAIN OUTCOME MEASURES Score on the CASI at follow-up study visits and incident dementia diagnosed in study participants, adjusted for baseline cognitive scores, age, and other risk factors. RESULTS During a mean (SD) follow-up of 6.1 (3.2) years, 1601 participants had no hospitalization, 1287 had 1 or more noncritical illness hospitalizations, and 41 had 1 or more critical illness hospitalizations. The CASI score was assessed more than 45 days after discharge for 94.3% of participants. Adjusted CASI scores averaged 1.01 points lower for visits following acute care illness hospitalization compared with follow-up visits not following any hospitalization (95% confidence interval [CI], -1.33 to -0.70; P < .001) and 2.14 points lower on average for visits following critical illness hospitalization (95% CI, -4.24 to -0.03; P = .047). There were 146 cases of dementia among those not hospitalized, 228 cases of dementia among those with 1 or more noncritical illness hospitalizations, and 5 cases of dementia among those with 1 or more critical illness hospitalizations. The adjusted hazard ratio for incident dementia was 1.4 following a noncritical illness hospitalization (95% CI, 1.1 to 1.7; P = .001) and 2.3 following a critical illness hospitalization (95% CI, 0.9 to 5.7; P = .09). CONCLUSIONS Among a cohort of older adults without dementia at baseline, those who experienced acute care hospitalization and critical illness hospitalization had a greater likelihood of cognitive decline compared with those who had no hospitalization. Noncritical illness hospitalization was significantly associated with the development of dementia.

Rosuvastatin for Sepsis-Associated Acute Respiratory Distress Syndrome

BACKGROUND In the acute respiratory distress syndrome (ARDS), inflammation in the lungs and other organs can cause life-threatening organ failure. Inhibitors of 3-hydroxy-3-methylglutaryl coenzyme A reductase (statins) can modulate inflammatory responses. Previous observational studies suggested that statins improved clinical outcomes in patients with sepsis. We hypothesized that rosuvastatin therapy would improve clinical outcomes in critically ill patients with sepsis-associated ARDS. METHODS We conducted a multicenter trial in which patients with sepsis-associated ARDS were randomly assigned to receive either enteral rosuvastatin or placebo in a double-blind manner. The primary outcome was mortality before hospital discharge home or until study day 60 if the patient was still in a health care facility. Secondary outcomes included the number of ventilator-free days (days that patients were alive and breathing spontaneously) to day 28 and organ-failure-free days to day 14. RESULTS The study was stopped because of futility after 745 of an estimated 1000 patients had been enrolled. There was no significant difference between study groups in 60-day in-hospital mortality (28.5% with rosuvastatin and 24.9% with placebo, P=0.21) or in mean (±SD) ventilator-free days (15.1±10.8 with rosuvastatin and 15.1±11.0 with placebo, P=0.96). The groups were well matched with respect to demographic and key physiological variables. Rosuvastatin therapy, as compared with placebo, was associated with fewer days free of renal failure to day 14 (10.1±5.3 vs. 11.0±4.7, P=0.01) and fewer days free of hepatic failure to day 14 (10.8±5.0 vs. 11.8±4.3, P=0.003). Rosuvastatin was not associated with an increased incidence of serum creatine kinase levels that were more than 10 times the upper limit of the normal range. CONCLUSIONS Rosuvastatin therapy did not improve clinical outcomes in patients with sepsis-associated ARDS and may have contributed to hepatic and renal organ dysfunction. (Funded by the National Heart, Lung, and Blood Institute and the Investigator-Sponsored Study Program of AstraZeneca; ClinicalTrials.gov number, NCT00979121.).

An Official American Thoracic Society Clinical Practice Guideline: The Diagnosis of Intensive Care Unit–acquired Weakness in Adults

RATIONALE Profound muscle weakness during and after critical illness is termed intensive care unit-acquired weakness (ICUAW). OBJECTIVES To develop diagnostic recommendations for ICUAW. METHODS A multidisciplinary expert committee generated diagnostic questions. A systematic review was performed, and recommendations were developed using the Grading, Recommendations, Assessment, Development, and Evaluation (GRADE) approach. MEASUREMENT AND MAIN RESULTS Severe sepsis, difficult ventilator liberation, and prolonged mechanical ventilation are associated with ICUAW. Physical rehabilitation improves outcomes in heterogeneous populations of ICU patients. Because it may not be feasible to provide universal physical rehabilitation, an alternative approach is to identify patients most likely to benefit. Patients with ICUAW may be such a group. Our review identified only one case series of patients with ICUAW who received physical therapy. When compared with a case series of patients with ICUAW who did not receive structured physical therapy, evidence suggested those who receive physical rehabilitation were more frequently discharged home rather than to a rehabilitative facility, although confidence intervals included no difference. Other interventions show promise, but fewer data proving patient benefit existed, thus precluding specific comment. Additionally, prior comorbidity was insufficiently defined to determine its influence on outcome, treatment response, or patient preferences for diagnostic efforts. We recommend controlled clinical trials in patients with ICUAW that compare physical rehabilitation with usual care and further research in understanding risk and patient preferences. CONCLUSIONS Research that identifies treatments that benefit patients with ICUAW is necessary to determine whether the benefits of diagnostic testing for ICUAW outweigh its burdens.

The Epidemiology of Chronic Critical Illness in the United States

Objectives:The epidemiology of chronic critical illness is not well characterized. We sought to determine the prevalence, outcomes, and associated costs of chronic critical illness in the United States. Design:Population-based cohort study using data from the United States Healthcare Costs and Utilization Project from 2004 to 2009. Setting:Acute care hospitals in Massachusetts, North Carolina, Nebraska, New York, and Washington. Patients:Adult and pediatric patients meeting a consensus-derived definition for chronic critical illness, which included one of six eligible clinical conditions (prolonged acute mechanical ventilation, tracheotomy, stroke, traumatic brain injury, sepsis, or severe wounds) plus at least 8 days in an ICU. Interventions:None. Measurements and Main Results:Out of 3,235,741 admissions to an ICU during the study period, 246,151 (7.6%) met the consensus definition for chronic critical illness. The most common eligibility conditions were prolonged acute mechanical ventilation (72.0% of eligible admissions) and sepsis (63.7% of eligible admissions). Among patients meeting chronic critical illness criteria through sepsis, the infections were community acquired in 48.5% and hospital acquired in 51.5%. In-hospital mortality was 30.9% with little change over the study period. The overall population-based prevalence was 34.4 per 100,000. The prevalence varied substantially with age, peaking at 82.1 per 100,000 individuals 75–79 years old but then declining coincident with a rise in mortality before day 8 in otherwise eligible patients. Extrapolating to the entire United States, for 2009, we estimated a total of 380,001 cases; 107,880 in-hospital deaths and

Predictors of posttraumatic stress disorder and return to usual major activity in traumatically injured intensive care unit survivors.

26 billion in hospital-related costs. Conclusions:Using a consensus-based definition, the prevalence, hospital mortality, and costs of chronic critical illness are substantial. Chronic critical illness is particularly common in the elderly although in very old patients the prevalence declines, in part because of an increase in early mortality among potentially eligible patients.

A longitudinal investigation of posttraumatic stress and depressive symptoms over the course of the year following medical–surgical intensive care unit admission

OBJECTIVE To assess intensive care unit (ICU)/acute care service-delivery characteristics and pre-ICU factors as predictors of posttraumatic stress disorder (PTSD) and return to usual major activity after ICU admission for trauma. METHOD Data from the National Study on the Costs and Outcomes of Trauma were used to evaluate a prospective cohort of 1906 ICU survivors. We assessed PTSD with the PTSD Checklist. Regression analyses ascertained associations between ICU/acute care service-delivery characteristics, pre-ICU factors, early post-ICU distress and 12-month PTSD and return to usual activity, while controlling for clinical and demographic characteristics. RESULTS Approximately 25% of ICU survivors had symptoms suggestive of PTSD. Increased early post-ICU distress predicted both PTSD and diminished usual major activity. Pulmonary artery catheter insertion [risk ratio (RR) 1.28, 95% confidence interval (95% CI) 1.05-1.57, P=.01] and pre-ICU depression (RR 1.23, 95% CI 1.02-1.49, P=.03) were associated with PTSD. Longer ICU lengths of stay (RR 1.21, 95% CI 1.03-1.44, P=.02) and tracheostomy (RR 1.29, 95% CI 1.05-1.59, P=.01) were associated with diminished usual activity. Greater preexisting medical comorbidities were associated with PTSD and limited return to usual activity. CONCLUSIONS Easily identifiable risk factors including ICU/acute care service-delivery characteristics and early post-ICU distress were associated with increased risk of PTSD and limitations in return to usual major activity. Future investigations could develop early screening interventions in acute care settings targeting these risk factors, facilitating appropriate treatments.

A multicenter mortality prediction model for patients receiving prolonged mechanical ventilation.

OBJECTIVE The objective was to identify risk factors for posttraumatic stress disorder (PTSD) and depressive symptoms after medical-surgical intensive care unit (ICU) admission. METHOD This longitudinal investigation included 150 medical-surgical ICU patients. We assessed acute stress and post-ICU PTSD symptoms with the PTSD Checklist-Civilian Version and post-ICU depressive symptoms with the Patient Health Questionnaire-9. Mixed-model linear regression ascertained associations between patient and clinical characteristics and repeated measures of post-ICU PTSD and depressive symptoms. RESULTS The prevalences of substantial PTSD and depressive symptoms were 16% and 31% at 3 months post-ICU and 15% and 17% at 12 months post-ICU, respectively. In-hospital substantial acute stress symptoms [beta: 16.9, 95% confidence Interval (CI): 11.4, 22.4] were independently associated with increased post-ICU PTSD symptoms. Lifetime history of major depression (beta: 2.2, 95% CI: 0.1, 4.2), greater prior trauma exposure (beta: 0.5, 95% CI: 0.2, 0.9) and in-hospital substantial acute stress symptoms (beta: 3.5, 95% CI: 0.8, 6.2) were independently associated with increased post-ICU depressive symptoms. CONCLUSIONS In-hospital acute stress symptoms may represent a modifiable risk factor for psychiatric morbidity in ICU survivors. Early interventions for at-risk ICU survivors may improve longer-term psychiatric outcomes.

Functional disability, cognitive impairment, and depression after hospitalization for pneumonia.

Objective:Significant deficiencies exist in the communication of prognosis for patients requiring prolonged mechanical ventilation after acute illness, in part because of clinician uncertainty about long-term outcomes. We sought to refine a mortality prediction model for patients requiring prolonged ventilation using a multicentered study design. Design:Cohort study. Setting:Five geographically diverse tertiary care medical centers in the United States (California, Colorado, North Carolina, Pennsylvania, and Washington). Patients:Two hundred sixty adult patients who received at least 21 days of mechanical ventilation after acute illness. Interventions:None. Measurements and Main Results:For the probability model, we included age, platelet count, and requirement for vasopressors and/or hemodialysis, each measured on day 21 of mechanical ventilation, in a logistic regression model with 1-yr mortality as the outcome variable. We subsequently modified a simplified prognostic scoring rule (ProVent score) by categorizing the risk variables (age 18–49, 50–64, and ≥65 yrs; platelet count 0–150 and >150; vasopressors; hemodialysis) in another logistic regression model and assigning points to variables according to &bgr; coefficient values. Overall mortality at 1 yr was 48%. The area under the curve of the receiver operator characteristic curve for the primary ProVent probability model was 0.79 (95% confidence interval 0.75–0.81), and the p value for the Hosmer-Lemeshow goodness-of-fit statistic was .89. The area under the curve for the categorical model was 0.77, and the p value for the goodness-of-fit statistic was .34. The area under the curve for the ProVent score was 0.76, and the p value for the Hosmer-Lemeshow goodness-of-fit statistic was .60. For the 50 patients with a ProVent score >2, only one patient was able to be discharged directly home, and 1-yr mortality was 86%. Conclusion:The ProVent probability model is a simple and reproducible model that can accurately identify patients requiring prolonged mechanical ventilation who are at high risk of 1-yr mortality. (Crit Care Med 2012; 40:–1176)

Development and pilot testing of a decision aid for surrogates of patients with prolonged mechanical ventilation

OBJECTIVE The study objective was to examine whether hospitalization for pneumonia is associated with functional decline, cognitive impairment, and depression, and to compare this impairment with that seen after known disabling conditions, such as myocardial infarction or stroke. METHODS We used data from a prospective cohort of 1434 adults aged more than 50 years who survived 1711 hospitalizations for pneumonia, myocardial infarction, or stroke drawn from the Health and Retirement Study (1998-2010). Main outcome measures included the number of Activities and Instrumental Activities of Daily Living requiring assistance and the presence of cognitive impairment and substantial depressive symptoms. RESULTS Hospitalization for pneumonia was associated with 1.01 new impairments in Activities and Instrumental Activities of Daily Living (95% confidence interval [CI], 0.71-1.32) among patients without baseline functional impairment and 0.99 new impairments in Activities and Instrumental Activities of Daily Living (95% CI, 0.57-1.41) among those with mild-to-moderate baseline limitations, as well as moderate-to-severe cognitive impairment (odds ratio, 2.46; 95% CI, 1.60-3.79) and substantial depressive symptoms (odds ratio, 1.63; 95% CI, 1.06-2.51). Patients without baseline functional impairment who survived pneumonia hospitalization had more subsequent impairments in Activities and Instrumental Activities of Daily Living than those who survived myocardial infarction hospitalization. There were no significant differences in subsequent moderate-to-severe cognitive impairment or substantial depressive symptoms between patients who survived myocardial infarction or stroke and those who survived pneumonia. CONCLUSIONS Hospitalization for pneumonia in older adults is associated with subsequent functional and cognitive impairment. Improved pneumonia prevention and interventions to ameliorate adverse sequelae during and after hospitalization may improve outcomes.

Liberation From Mechanical Ventilation in Critically Ill Adults: An Official American College of Chest Physicians/American Thoracic Society Clinical Practice Guideline: Inspiratory Pressure Augmentation During Spontaneous Breathing Trials, Protocols Minimizing Sedation, and Noninvasive Ventilation Immediately After Extubation.

Objective: Shared decision making is inadequate in intensive care units. Decision aids can improve decision making quality, though their role in an intensive care units setting is unclear. We aimed to develop and pilot test a decision aid for shared decision makers of patients undergoing prolonged mechanical ventilation. Setting: Intensive care units at three medical centers. Subjects: Fifty-three surrogate decision makers and 58 physicians. Design and Interventions: We developed the decision aid using defined methodological guidelines. After an iterative revision process, formative cognitive testing was performed among surrogate–physician dyads. Next, we compared the decision aid to usual care control in a prospective, before/after design study. Measurements and Main Results: Primary outcomes were physician–surrogate discordance for expected patient survival, comprehension of relevant medical information, and the quality of communication. Compared to control, the intervention group had lower surrogate–physician discordance (7 [10] vs. 43 [21]), greater comprehension (11.4 [0.7] vs. 6.1 [3.7]), and improved quality of communication (8.7 [1.3] vs. 8.4 [1.3]) (all p < .05) post-intervention. Hospital costs were lower in the intervention group (