Statistical analysis plan for a cluster-randomized crossover trial comparing the effectiveness and safety of a flexible family visitation model for delirium prevention in adult intensive care units (the ICU Visits Study)

Mechanism of a Flexible ICU Visiting Policy for Anxiety Symptoms Among Family Members in Brazil: A Path Mediation Analysis in a Cluster-Randomized Clinical Trial

OBJECTIVES

To investigate whether the effect of a flexible ICU visiting policy that includes flexible visitation plus visitor education on anxiety symptoms of family members is mediated by satisfaction and involvement in patient care.

DESIGN

We embedded a multivariable path mediation analysis within a cluster-randomized crossover trial as a secondary analysis of The ICU Visits Study (ClinicalTrials.gov number: NCT02932358).

SETTING

Thirty-six medical-surgical ICUs in Brazil.

PATIENTS

Closest relatives of adult ICU patients.

INTERVENTIONS

Flexible visitation (12 hr/d) supported by family education or usual restricted visitation (median, 1.5 hr/d).

MEASUREMENTS AND MAIN RESULTS

Overall, 863 family members were assessed (mean age, 44.7 yr; women, 70.1%). Compared with the restricted visitation (n = 436), flexible visitation (n = 427) resulted in better mean anxiety scores (6.1 vs 7.8; mean difference, -1.78 [95% CI, -2.31 to -1.22]), as well as higher standardized scores of satisfaction (67% [95% CI, 55-79]) and involvement in patient care (77% [95% CI, 64-89]). The mediated effect of flexible visitation on mean anxiety scores through each incremental SD of satisfaction and involvement in patient care were -0.47 (95% CI, -0.68 to -0.24) and 0.29 (95% CI, 0.04-0.54), respectively. Upon exploratory analyses, emotional support, helping the ICU staff to understand patient needs, helping the patient to interpret ICU staff instructions, and patient reorientation were the domains of involvement in patient care associated with increased anxiety.

CONCLUSIONS

A flexible ICU visiting policy reduces anxiety symptoms among family members and appears to work by increasing satisfaction. However, increased participation in some activities of patient care as a result of flexible visitation was associated with higher severity of anxiety symptoms.

Effect of Flexible Family Visitation on Delirium Among Patients in the Intensive Care Unit: The ICU Visits Randomized Clinical Trial

IMPORTANCE

The effects of intensive care unit (ICU) visiting hours remain uncertain.

OBJECTIVE

To determine whether a flexible family visitation policy in the ICU reduces the incidence of delirium.

DESIGN, SETTING AND PARTICIPANTS

Cluster-crossover randomized clinical trial involving patients, family members, and clinicians from 36 adult ICUs with restricted visiting hours (<4.5 hours per day) in Brazil. Participants were recruited from April 2017 to June 2018, with follow-up until July 2018.

INTERVENTIONS

Flexible visitation (up to 12 hours per day) supported by family education (n = 837 patients, 652 family members, and 435 clinicians) or usual restricted visitation (median, 1.5 hours per day; n = 848 patients, 643 family members, and 391 clinicians). Nineteen ICUs started with flexible visitation, and 17 started with restricted visitation.

MAIN OUTCOMES AND MEASURES

Primary outcome was incidence of delirium during ICU stay, assessed using the CAM-ICU. Secondary outcomes included ICU-acquired infections for patients; symptoms of anxiety and depression assessed using the HADS (range, 0 [best] to 21 [worst]) for family members; and burnout for ICU staff (Maslach Burnout Inventory).

RESULTS

Among 1685 patients, 1295 family members, and 826 clinicians enrolled, 1685 patients (100%) (mean age, 58.5 years; 47.2% women), 1060 family members (81.8%) (mean age, 45.2 years; 70.3% women), and 737 clinicians (89.2%) (mean age, 35.5 years; 72.9% women) completed the trial. The mean daily duration of visits was significantly higher with flexible visitation (4.8 vs 1.4 hours; adjusted difference, 3.4 hours [95% CI, 2.8 to 3.9]; P < .001). The incidence of delirium during ICU stay was not significantly different between flexible and restricted visitation (18.9% vs 20.1%; adjusted difference, -1.7% [95% CI, -6.1% to 2.7%]; P = .44). Among 9 prespecified secondary outcomes, 6 did not differ significantly between flexible and restricted visitation, including ICU-acquired infections (3.7% vs 4.5%; adjusted difference, -0.8% [95% CI, -2.1% to 1.0%]; P = .38) and staff burnout (22.0% vs 24.8%; adjusted difference, -3.8% [95% CI, -4.8% to 12.5%]; P = .36). For family members, median anxiety (6.0 vs 7.0; adjusted difference, -1.6 [95% CI, -2.3 to -0.9]; P < .001) and depression scores (4.0 vs 5.0; adjusted difference, -1.2 [95% CI, -2.0 to -0.4]; P = .003) were significantly better with flexible visitation.

CONCLUSIONS AND RELEVANCE

Among patients in the ICU, a flexible family visitation policy, vs standard restricted visiting hours, did not significantly reduce the incidence of delirium.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT02932358.