Browsing by Author "Cox, Christopher E"

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    ItemOpen Access
    Development and usability testing of a Web-based decision aid for families of patients receiving prolonged mechanical ventilation.
    (Ann Intensive Care, 2015) Cox, Christopher E; Wysham, Nicholas G; Walton, Brenda; Jones, Derek; Cass, Brian; Tobin, Maria; Jonsson, Mattias; Kahn, Jeremy M; White, Douglas B; Hough, Catherine L; Lewis, Carmen L; Carson, Shannon S
    BACKGROUND: Web-based decision aids are increasingly important in medical research and clinical care. However, few have been studied in an intensive care unit setting. The objectives of this study were to develop a Web-based decision aid for family members of patients receiving prolonged mechanical ventilation and to evaluate its usability and acceptability. METHODS: Using an iterative process involving 48 critical illness survivors, family surrogate decision makers, and intensivists, we developed a Web-based decision aid addressing goals of care preferences for surrogate decision makers of patients with prolonged mechanical ventilation that could be either administered by study staff or completed independently by family members (Development Phase). After piloting the decision aid among 13 surrogate decision makers and seven intensivists, we assessed the decision aid's usability in the Evaluation Phase among a cohort of 30 surrogate decision makers using the Systems Usability Scale (SUS). Acceptability was assessed using measures of satisfaction and preference for electronic Collaborative Decision Support (eCODES) versus the original printed decision aid. RESULTS: The final decision aid, termed 'electronic Collaborative Decision Support', provides a framework for shared decision making, elicits relevant values and preferences, incorporates clinical data to personalize prognostic estimates generated from the ProVent prediction model, generates a printable document summarizing the user's interaction with the decision aid, and can digitally archive each user session. Usability was excellent (mean SUS, 80 ± 10) overall, but lower among those 56 years and older (73 ± 7) versus those who were younger (84 ± 9); p = 0.03. A total of 93% of users reported a preference for electronic versus printed versions. CONCLUSIONS: The Web-based decision aid for ICU surrogate decision makers can facilitate highly individualized information sharing with excellent usability and acceptability. Decision aids that employ an electronic format such as eCODES represent a strategy that could enhance patient-clinician collaboration and decision making quality in intensive care.
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    Posttraumatic Stress Disorder Symptom Clusters in Surrogate Decision Makers of Patients Experiencing Chronic Critical Illness.
    (Critical care explorations, 2022-03) Wendlandt, Blair; Ceppe, Agathe; Gaynes, Bradley N; Cox, Christopher E; Hanson, Laura C; Nelson, Judith E; Carson, Shannon S
    Symptoms of posttraumatic stress disorder (PTSD) are common among surrogate decision makers of patients with chronic critical illness (CCI). PTSD symptoms can be categorized into clusters including intrusion, avoidance, and hyperarousal, each of which has been associated with distinct outcomes and treatment responses. Our objective was to determine which symptom cluster was predominant among surrogates of patients with CCI.

    Design

    Secondary analysis of data from a clinical trial of a communication intervention.

    Setting

    The original trial was conducted in medical intensive care units at three tertiary-care centers and one community hospital.

    Patients

    Patients with CCI (≥7 d of mechanical ventilation and not expected to die or to be weaned from the ventilator in the subsequent 72 hr) and their surrogates.

    Interventions

    None.

    Measurements and main results

    Surrogate PTSD symptoms were measured 90 days after onset of patient CCI using the Impact of Events Scale-Revised (IES-R). The IES-R includes a total score (range, 0-88, higher scores indicate severe symptoms) as well as three subscales that assess intrusion, avoidance, and hyperarousal (range of intrusion and avoidance scores 0-32 and range of hyperarousal score 0-24). Intrusion symptoms were most severe (mean score, 10.3; 95% CI, 9.3-11.2), followed by avoidance (mean score, 8.0; 95% CI, 7.2-8.8). Hyperarousal symptoms were lowest (mean score, 5.1; 95% CI, 4.5-5.7). In a multivariable linear regression model, we found that surrogates of patients who died had higher odds of intrusion (β, 5.52; p < 0.0001) and avoidance (β, 3.29; p = 0.001) symptoms than surrogates of patients who lived, even after adjusting for baseline symptoms of anxiety and depression. Patient death was not associated with hyperarousal symptoms.

    Conclusions

    Intrusive thoughts are the most severe PTSD symptom in surrogates of patients experiencing CCI, with intensified symptoms among surrogates of patients who died. These results have the potential to inform tailored treatment strategies to reduce PTSD symptoms in this population.
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    Utility of skin tone on pulse oximetry in critically ill patients: a prospective cohort study.
    (medRxiv, 2024-02-27) Hao, Sicheng; Dempsey, Katelyn; Matos, João; Cox, Christopher E; Rotemberg, Veronica; Gichoya, Judy W; Kibbe, Warren; Hong, Chuan; Wong, Ian
    IMPORTANCE: Pulse oximetry, a ubiquitous vital sign in modern medicine, has inequitable accuracy that disproportionately affects Black and Hispanic patients, with associated increases in mortality, organ dysfunction, and oxygen therapy. Although the root cause of these clinical performance discrepancies is believed to be skin tone, previous retrospective studies used self-reported race or ethnicity as a surrogate for skin tone. OBJECTIVE: To determine the utility of objectively measured skin tone in explaining pulse oximetry discrepancies. DESIGN SETTING AND PARTICIPANTS: Admitted hospital patients at Duke University Hospital were eligible for this prospective cohort study if they had pulse oximetry recorded up to 5 minutes prior to arterial blood gas (ABG) measurements. Skin tone was measured across sixteen body locations using administered visual scales (Fitzpatrick Skin Type, Monk Skin Tone, and Von Luschan), reflectance colorimetry (Delfin SkinColorCatch [L*, individual typology angle {ITA}, Melanin Index {MI}]), and reflectance spectrophotometry (Konica Minolta CM-700D [L*], Variable Spectro 1 [L*]). MAIN OUTCOMES AND MEASURES: Mean directional bias, variability of bias, and accuracy root mean square (ARMS), comparing pulse oximetry and ABG measurements. Linear mixed-effects models were fitted to estimate mean directional bias while accounting for clinical confounders. RESULTS: 128 patients (57 Black, 56 White) with 521 ABG-pulse oximetry pairs were recruited, none with hidden hypoxemia. Skin tone data was prospectively collected using 6 measurement methods, generating 8 measurements. The collected skin tone measurements were shown to yield differences among each other and overlap with self-reported racial groups, suggesting that skin tone could potentially provide information beyond self-reported race. Among the eight skin tone measurements in this study, and compared to self-reported race, the Monk Scale had the best relationship with differences in pulse oximetry bias (point estimate: -2.40%; 95% CI: -4.32%, -0.48%; p=0.01) when comparing patients with lighter and dark skin tones. CONCLUSIONS AND RELEVANCE: We found clinical performance differences in pulse oximetry, especially in darker skin tones. Additional studies are needed to determine the relative contributions of skin tone measures and other potential factors on pulse oximetry discrepancies.