Publications by authors named "Deborah Cook"

Background: In Canada, academic hospitals are the principal drivers of research and medical education, while community hospitals provide patient care to a majority of the population. Benefits of increasing community hospital research include improved patient outcomes and access to research, enhanced staff satisfaction and retention and increased research efficiency and generalizability. While the resources required to build Canadian community hospital research capacity have been identified, strategies for strengthening organizational research culture in these settings are not well defined.

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Purpose: Community hospitals account for 90% of hospitals in Canada, but clinical research is mainly conducted in academic hospitals. Increasing community hospital research participation can improve generalizability of study results, while also accelerating study recruitment and increasing staff engagement. We aimed to identify and describe the factors that influence community intensive care unit (ICU) research participation and the development, implementation, and sustainability of a community ICU research program.

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Background: Bloodstream infections are associated with substantial morbidity and mortality. Early, appropriate antibiotic therapy is important, but the duration of treatment is uncertain.

Methods: In a multicenter, noninferiority trial, we randomly assigned hospitalized patients (including patients in the intensive care unit [ICU]) who had bloodstream infection to receive antibiotic treatment for 7 days or 14 days.

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  • Survivors of critical illness often experience physical dysfunction post-ICU discharge, and the CYCLE trial aims to evaluate the effectiveness of in-bed cycle ergometry for improving short-term physical function in these patients.!* -
  • The CYCLE trial, involving 360 patients across multiple centers, employs a prespecified statistical analysis plan to assess outcomes like the PFIT-s score three days after ICU discharge, while considering variables such as age, frailty, and sex.!* -
  • Funded in 2017, the CYCLE study completed enrollment in May 2023, with data analyses finished and first results expected to be published in 2024.!*
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Background: Cycle ergometry is a rehabilitation strategy used in the intensive care unit (ICU) which may help mitigate post-ICU impairments. We aimed to systematically review and summarize evidence examining the efficacy and safety of cycle ergometry in the ICU.

Methods: We included randomized controlled trials (RCTs) of critically ill adults with any diagnosis admitted to the ICU for >24 hours, comparing cycling interventions to control (no cycling).

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  • The study investigates how often to screen critically ill adults on ventilators and the best method for conducting spontaneous breathing trials (SBT) to successfully extubate them.
  • It involves a randomized clinical trial with 797 participants who required mechanical ventilation, comparing once-daily and more frequent screenings alongside two SBT techniques: pressure-supported and T-piece.
  • Results show no significant differences in the time to successful extubation based on screening frequency or SBT technique, indicating that both methods may be similarly effective.
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Purpose: Physical rehabilitation (PR) in the intensive care unit (ICU) may improve outcomes for survivors but clinical trial results have been discordant. We hypothesized that discordant results may reflect treatment heterogeneity received by "usual care" comparator groups in PR studies. Usual-care PR is typically underspecified, which is a barrier to comparing results across treatment studies.

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  • * Although clinical trial design has evolved, data collection infrastructure still requires heavy investment and labor, limiting the evidence available for understanding how treatments affect different patient groups.
  • * The authors propose a modernized data infrastructure that promotes the integration of diverse data sources and facilitates the reuse of health data, highlighting the importance of multidisciplinary collaboration to track progress in this area.
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  • The COVID-19 pandemic significantly disrupted clinical trials globally, leading to issues such as premature closures and compromised trial integrity, necessitating changes in research protocols.
  • The study aimed to assess challenges faced during interrupted critical care trials, identifying barriers and developing strategies for future trials based on input from principal investigators and project coordinators.
  • Results indicated that major challenges included the prioritization of COVID-19 studies and restrictions on hospital visitation, while participants offered various solutions and suggestions to enhance trial conduct moving forward.
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Objectives: Although clinicians may use methylene blue (MB) in refractory septic shock, the effect of MB on patient-important outcomes remains uncertain. We conducted a systematic review and meta-analysis to investigate the benefits and harms of MB administration in patients with septic shock.

Data Sources: We searched six databases (including PubMed, Embase, and Medline) from inception to January 10, 2024.

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Background: The response of Canada's research community to the COVID-19 pandemic provides a unique opportunity to examine the country's clinical health research ecosystem. We sought to describe patterns of enrolment across Canadian Institutes of Health Research (CIHR)-funded studies on COVID-19.

Methods: We identified COVID-19 studies funded by the CIHR and that enrolled participants from Canadian acute care hospitals between January 2020 and April 2023.

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  • A study was conducted to evaluate the effects of the proton-pump inhibitor pantoprazole on critically ill patients undergoing invasive ventilation, comparing it to a placebo.
  • The trial included 4,821 patients and found that pantoprazole significantly reduced the incidence of clinically important upper gastrointestinal bleeding compared to placebo (1.0% vs. 3.5%).
  • However, there was no significant difference in overall mortality rates at 90 days between the pantoprazole group (29.1%) and the placebo group (30.9%).
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  • Critical illness requiring invasive mechanical ventilation can lead to significant physical disability, and early in-bed cycle ergometry may help reduce this impairment when added to standard physiotherapy in ICU patients.
  • A study with 360 adult patients randomly assigned to either early in-bed cycling plus usual physiotherapy or just usual physiotherapy found no significant difference in physical function scores three days after ICU discharge.
  • The addition of cycling did not result in any serious adverse events, indicating it is safe, but did not enhance recovery outcomes compared to standard therapy alone.
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Purpose: Frailty is common in critically ill patients but the timing and optimal method of frailty ascertainment, trajectory and relationship with care processes remain uncertain. We sought to elucidate the trajectory and care processes of frailty in critically ill patients as measured by the Clinical Frailty Scale (CFS) and Frailty Index (FI).

Methods: This is a multi-centre prospective cohort study enrolling patients ≥ 50 years old receiving life support > 24 h.

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The DNA damage response of the multi-drug-resistant nosocomial pathogen possesses multiple features that distinguish it from the commonly used LexA repression system. These include the absence of LexA in this genus, the evolution of a UmuD polymerase manager into the UmuDAb repressor of error-prone polymerases, the use of a corepressor unique to (DdrR), and an unusually large UmuDAb binding site. We defined cis- and trans-acting factors required for UmuDAb DNA binding and gene repression, and tested whether DdrR directly enhances its DNA binding.

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  • During the COVID-19 pandemic, many ICUs paused ongoing research to prioritize studies related to the virus, but the REVISE trial continued investigating stress ulcer prophylaxis in mechanically ventilated patients.
  • The trial, which compares pantoprazole against a placebo, enrolled 2,961 patients across 59 centers, despite facing disruptions in enrollment during the pandemic.
  • Changes in the informed consent process included a shift to a 'consent to continue' model and an increase in telephone consent due to restrictions, leading to a slight rise in overall consent rates.
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Background: In acute respiratory distress syndrome (ARDS), respiratory drive often differs among patients with similar clinical characteristics. Readily observable factors like acid-base state, oxygenation, mechanics, and sedation depth do not fully explain drive heterogeneity. This study evaluated the relationship of systemic inflammation and vascular permeability markers with respiratory drive and clinical outcomes in ARDS.

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Background: Proton pump inhibitors (PPIs) are the most commonly prescribed drugs for preventing upper gastrointestinal bleeding in critically ill patients. However, concerns have arisen about the possible harms of using PPIs, including potentially increased risk of pneumonia, Clostridioides difficile infection, and more seriously, an increased risk of death in the most severely ill patients. Triggered by the REVISE trial, which is a forthcoming large randomized trial comparing pantoprazole to placebo in invasively mechanically ventilated patients, we will conduct this systematic review to evaluate the efficacy and safety of PPIs versus no prophylaxis for critically ill patients.

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Background: Ascertainment of the severity of the primary outcome of upper gastrointestinal (GI) bleeding is integral to stress ulcer prophylaxis trials. This protocol outlines the adjudication process for GI bleeding events in an international trial comparing pantoprazole to placebo in critically ill patients (REVISE: Re-Evaluating the Inhibition of Stress Erosions). The primary objective of the adjudication process is to assess episodes submitted by participating sites to determine which fulfil the definition of the primary efficacy outcome of clinically important upper GI bleeding.

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Purpose: The ordering of routine blood test panels in advance is common in intensive care units (ICUs), with limited consideration of the pretest probability of finding abnormalities. This practice contributes to anemia, false positive results, and health care costs. We sought to understand practices and attitudes of Canadian adult intensivists regarding ordering of blood tests in critically ill patients.

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Article Synopsis
  • - The study aimed to define what constitutes "patient-important" upper gastrointestinal bleeding during critical illness for a randomized trial, focusing on the perspectives of ICU survivors and their family members.
  • - Using interviews and focus groups, researchers gathered qualitative data, which revealed that patient-important bleeding is linked to serious outcomes like death, disability, and extended hospital stays, along with specific medical interventions.
  • - Findings highlighted that patients and families view gastrointestinal bleeding differently than traditional clinical definitions, emphasizing the context and effects of treatments as crucial to understanding its importance.
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