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Continuous positive airway pressure (CPAP) as a ceiling of care treatment for hypoxaemic respiratory failure due to COVID-19

Patrick Bradley, Jennifer Nixon, James Wilson, James Redfern, Tarek Saba, Emily Nuttall and Thomas Bongers
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DOI: https://doi.org/10.7861/clinmed.21-2-s21
Clin Med March 2021
Patrick Bradley
ABlackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
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Jennifer Nixon
BLancashire Teaching Hospitals NHS Foundation Trust, Lancashire, UK
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James Wilson
ABlackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
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James Redfern
BLancashire Teaching Hospitals NHS Foundation Trust, Lancashire, UK
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Tarek Saba
ABlackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
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Emily Nuttall
BLancashire Teaching Hospitals NHS Foundation Trust, Lancashire, UK
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Thomas Bongers
ABlackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
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Introduction

COVID-19 causes a wide spectrum of disease, which at its most severe can lead to hypoxaemic respiratory failure necessitating respiratory support. While guidelines recommend CPAP as a treatment option for such patients, including those for whom CPAP is the ceiling of care, there are no controlled trials informing this practice.1 The current RECOVERY-RS trial is assessing the use of CPAP for COVID-19, but excludes patients considered unsuitable for invasive ventilation.2 Those caring for such patients with COVID-19 in the ward setting must balance the potential benefits of CPAP against the burdens imposed by it; data in this patient population are urgently needed.

Materials and methods

We collected data on all patients commencing CPAP as a ceiling of care treatment for hypoxaemic respiratory failure due to COVID-19 on the wards of two UK teaching hospitals during the first two months of the COVID-19 pandemic. The primary outcome was 30-day all-cause mortality. Secondary outcomes were duration of CPAP treatment, reasons for CPAP discontinuation, and duration of admission. Data about factors prior to and during CPAP treatment were collated, and their relationship with 30-day mortality tested for statistical significance using standard non-parametric methods.

Results and Discussion

Seventy patients received CPAP as a ceiling of care treatment during this period, of whom 49 (70%) died within 30 days. There were no significant associations between patient factors and 30-day mortality (Table 1). Twenty-one patients (30%) initiated their own withdrawal from CPAP, and three (4.3%) died on CPAP. Those patients who survived to 30 days required a median of 5 days on CPAP (interquartile range (IQR) 2–9) and 23 days in hospital (IQR 15–26).

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Table 1.

Patient factors and 30-day mortality

This was a pragmatic multi-centre observational study examining clinically relevant endpoints in this understudied population of patients deemed not suitable for invasive ventilation. It was limited by a small sample size and lack of a control group. However, with no randomised controlled trials or case-control studies yet published in this patient group, we hope our data can add to the limited body of evidence available to inform practice.

Conclusion

Patients treated with CPAP as a ceiling of care for COVID-19 associated respiratory failure have a high mortality, and a significant proportion choose to stop treatment. In our cohort, neither patient factors nor CPAP settings predicted 30-day mortality. Further work is needed, including larger studies, comparison with other management strategies for such patients, and exploration of the physical and psychological effects of CPAP on patients and staff.

Conflicts of interest

None declared.

  • © Royal College of Physicians 2021. All rights reserved.

References

  1. ↵
    1. NHS England
    . Guidance for the role and use of non-invasive respiratory support in adult patients with COVID-19 (confirmed or suspected). NHS, 2020. www.nice.org.uk/Media/Default/About/COVID-19/Specialty-guides/specialty-guide-NIV-respiratory-support-and-coronavirus.pdf [Accessed 27 November 2020].
  2. ↵
    1. University of Warwick
    . RECOVERY-RS Respiratory Support: Respiratory strategies in COVID-19; CPAP, high-flow, and standard care. University of Warwick, 2020. https://warwick.ac.uk/fac/sci/med/research/ctu/trials/recovery-rs/ [Accessed 1 Jul 2020].
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Continuous positive airway pressure (CPAP) as a ceiling of care treatment for hypoxaemic respiratory failure due to COVID-19
Patrick Bradley, Jennifer Nixon, James Wilson, James Redfern, Tarek Saba, Emily Nuttall, Thomas Bongers
Clinical Medicine Mar 2021, 21 (Suppl 2) 21-22; DOI: 10.7861/clinmed.21-2-s21

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Continuous positive airway pressure (CPAP) as a ceiling of care treatment for hypoxaemic respiratory failure due to COVID-19
Patrick Bradley, Jennifer Nixon, James Wilson, James Redfern, Tarek Saba, Emily Nuttall, Thomas Bongers
Clinical Medicine Mar 2021, 21 (Suppl 2) 21-22; DOI: 10.7861/clinmed.21-2-s21
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