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David Harrison

@davidaharrison.bsky.social

Co-Director of ICNARC. Honorary Professor of medical statistics at LSHTM.

368 Followers  |  211 Following  |  45 Posts  |  Joined: 22.11.2024
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Posts by David Harrison (@davidaharrison.bsky.social)

Across the full range, it translated to more false negatives, which is the main clinical implication.

15.01.2026 17:49 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

At lower saturations, this translated to greater over-estimation of SaO2 (consistent with historical papers). At higher saturations, it translated to less under-estimation (as seen in the preprint, where SaO2s were generally high).

15.01.2026 17:49 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I think our new study actually bridges the gap between the previous evidence and the FDA-funded preprint. The consistent message we found was that the devices, on average, gave higher readings on darker skin tones.

15.01.2026 17:49 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Preview
The impact of skin tone on performance of pulse oximeters used by NHS England COVID Oximetry {at}home scheme: measurement and diagnostic accuracy study Objectives To assess the impact of skin tone on the measurement and diagnostic accuracy of five fingertip pulse oximeters used by patients in the NHS (National Health Service) England COVID Oximetry {...

Fantastic to see this published at last

An objective assessment of the efficacy of home pulse oximeters on different skin tones

Ping @iwashyna.bsky.social

Open to comments from all #foamed #medsky

www.bmj.com/content/392/...

15.01.2026 09:50 β€” πŸ‘ 30    πŸ” 24    πŸ’¬ 6    πŸ“Œ 2
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πŸŽ„ On the fourth day of Christmas CCR brings to thee

🎁 Four thousand seven hundred children
πŸŽ… No routine gastric residuals measured routinely
🎢 And a partridge in a pear tree

#CCR26
criticalcarereviews.com/meetings/ccr26

24.12.2025 18:32 β€” πŸ‘ 2    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0
A Delirium (UK) James Lind Alliance Priority Setting Partnership - Wolfson Institute of Population Health

Delighted to share details of @nihr.bsky.social James Lind Alliance research priority setting survey for delirium. For completion by UK health/social professionals and those with personal experience of delirium.
Complete the survey and have your say. More details πŸ‘‡
www.qmul.ac.uk/wiph/centres...

11.11.2025 23:32 β€” πŸ‘ 13    πŸ” 12    πŸ’¬ 0    πŸ“Œ 11

I completely agree that if this was entirely driven by a reduction in vasopressors then this is more of a process measure than a patient centred outcome, but the supplement suggests ventilation and RRT were also reduced

29.10.2025 18:48 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

It didn’t change mortality but reduced organ support by 1 day. Is this not a concrete outcome?

29.10.2025 17:53 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

If we design trials to detect superiority based on P<0.05, should we then throw them out as not sufficiently convincing because P=0.04?

I’d be more concerned whether this is showing the benefit of a complex CRT protocol or a clinician at the bedside.

29.10.2025 17:21 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I don’t think it was site selection, although some of our best recruiting sites were maybe in somewhat less diverse parts of the country. Interesting to reflect on whether there was any lack of equipoise.

12.06.2025 11:15 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 3    πŸ“Œ 0

Interesting point, Jack. If it reflected the UK population of ventilated patients (see supplement) we’d have expected more like 500 black patients so yes, somewhat under-represented but we would not have anticipated large numbers.

12.06.2025 11:15 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Conservative Oxygen Therapy With Mechanical Ventilation This randomized clinical trial assesses whether reducing supplemental oxygen to a peripheral oxygen saturation target of 90% would reduce mortality among critically ill adults receiving mechanical ven...

16,500 patients randomised to #UKROXTrial presented just now at #CCR25 and simultaneously published in @jama.com

No difference in 90d mortality between target SpO2 88-92 with reduced exposure to supplemental O2 vs usual care

jamanetwork.com/journals/jam...

12.06.2025 08:48 β€” πŸ‘ 9    πŸ” 5    πŸ’¬ 1    πŸ“Œ 2
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UK-ROx: No harm (or benefit) from a conservative oxygenation strategy in 16,500 mechanically ventilated critically ill adults. #CCR25

12.06.2025 08:51 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 1
Figure 2. Oxygen Exposure and Arterial Oxygenation by Treatment Group in Patients With Enhanced Data Collection

Figure 2. Oxygen Exposure and Arterial Oxygenation by Treatment Group in Patients With Enhanced Data Collection

Conservative oxygen therapy with a target SpO2 of 90% did not reduce 90-day all-cause mortality compared to usual oxygen therapy in mechanically ventilated adult patients.

#CCR25 @criticalcarereviews.com

https://ja.ma/4kG5gWK

12.06.2025 08:15 β€” πŸ‘ 16    πŸ” 16    πŸ’¬ 0    πŸ“Œ 0
Professor Dan Martin presenting the UK - ROX trial at Critical Care Reviews 2025

Professor Dan Martin presenting the UK - ROX trial at Critical Care Reviews 2025

Here we go… #UKROXtrial #CCR25

12.06.2025 08:04 β€” πŸ‘ 9    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Three healthcare professionals in scrubs collaborate around a glass wall covered in colourful sticky notes.

Three healthcare professionals in scrubs collaborate around a glass wall covered in colourful sticky notes.

Calling all UK-based healthcare professionals who have undertaken a quality improvement project! Share your experiences with us and help us to develop new approaches. Certificates of participation offered. Find out more and fill out the short survey ths.im/3SUUwHG

03.06.2025 08:03 β€” πŸ‘ 3    πŸ” 4    πŸ’¬ 0    πŸ“Œ 1
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CCR25 Critical Care Reviews Meeting 2025, Titanic Belfast, June 11th to 13th. Featuring 12 major critical care trial results

Try criticalcarereviews.com/meetings/ccr25

31.05.2025 16:55 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Flyer for the UK-ROX trial results presentation at #CCR25

Flyer for the UK-ROX trial results presentation at #CCR25

🚨UK-ROX TRIAL Results at #CCR25🚨

πŸ“ ~100 πŸ‡¬πŸ‡§ ICUs
πŸ‘₯ ~16,500 pts
🎯 Conservative vs usual oxygen therapy in invasively ventilated adults
🩺 Outcome: Mortality day 90

πŸ€” Will less oxygen save lives?

πŸ“Ί Free livestream β€” but it's better in person!
πŸ”— criticalcarereviews.com/ccr25

31.05.2025 15:58 β€” πŸ‘ 9    πŸ” 5    πŸ’¬ 2    πŸ“Œ 3
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The Society and the Faculty of Intensive Care Medicine (FICM) are updating the Guidelines for the Provision of Intensive Care Services (GPICS).

The consultation period for Version 3 is now open and we would value your feedback on the proposed changes.

Read more and take part belowπŸ‘‡

bit.ly/GPICSv3

14.05.2025 13:11 β€” πŸ‘ 5    πŸ” 5    πŸ’¬ 0    πŸ“Œ 0

Shocked to wake up to this news. Condolences to Rinaldo’s family and friends, and all our friends and colleagues in the ANZICS community. Vale Rinaldo.

07.05.2025 06:50 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Every 10 seconds vaccination saves a life.
Immunization for all is Humanly Possible

Every 10 seconds vaccination saves a life. Immunization for all is Humanly Possible

It’s #WorldImmunizationWeek

Vaccines have saved 154 million lives in the last 50 years. That’s 6 lives every minute.

A reminder of what is #HumanlyPossible. Science saves lives.

#VaccinesWork
bit.ly/wiw2025

24.04.2025 05:50 β€” πŸ‘ 809    πŸ” 303    πŸ’¬ 12    πŸ“Œ 17

Perfect demonstration of why a control is essential…

17.04.2025 13:09 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
Text reads: Principles of sharing clinical trial results with participants.
1. Trial teams should pro-actively offer overall study results to all clinical trial participants, irrespective of what the results show.
2. Participants should be given the choice of whether to receive research results.
3. Results should be offered to participants in a timely manner.
4. Trial teams should manage participants’ expectations around when the results will be available.
5. Results should be offered in a way that is accessible to participants, both in terms of the communication mechanism and the content.
6. Patient and public involvement is essential in sharing results with participants.
7. Sharing results with participants requires resources.
8. Consideration needs to be given to potential barriers/challenges to sharing results with participants from the planning stage of the study.

Text reads: Principles of sharing clinical trial results with participants. 1. Trial teams should pro-actively offer overall study results to all clinical trial participants, irrespective of what the results show. 2. Participants should be given the choice of whether to receive research results. 3. Results should be offered to participants in a timely manner. 4. Trial teams should manage participants’ expectations around when the results will be available. 5. Results should be offered in a way that is accessible to participants, both in terms of the communication mechanism and the content. 6. Patient and public involvement is essential in sharing results with participants. 7. Sharing results with participants requires resources. 8. Consideration needs to be given to potential barriers/challenges to sharing results with participants from the planning stage of the study.

People who take part in #ClinicalTrials and other research have a right to know the results of these studies.

Our 8 principles aim to improve the sharing of trial results with participants. They were developed alongside UK clinical research funders.

More detailsπŸ‘‰ buff.ly/SGrmL7o

17.04.2025 11:31 β€” πŸ‘ 8    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0

I think you’ll find 22/7 is a much more rational date to celebrate #piday

14.03.2025 15:27 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Invitation to a Two-Round Delphi Study on Sample Size Reporting in Trial Grant Applications and Protocols for Adaptive Designs!

Click the link below to participate πŸ‘:
docs.google.com/forms/d/e/1F...

Or directly contact: qzhang104@sheffield.ac.uk.

17.02.2025 13:55 β€” πŸ‘ 1    πŸ” 5    πŸ’¬ 1    πŸ“Œ 1
Preview
Hype, hallucination, hope – what might AI mean for our health? In our fifth REAL Challenge annual lecture, Hetan Shah will warn of the risk of rushing breathlessly to unleash technology. He will explore how policymakers can navigate the hype and critically assess...

I'm honoured to have been asked to give this year's @healthfoundation.bsky.social annual REAL Challenge lecture - on the theme of AI and health. Thursday 13th Feb in person / online. You can register here and please do share with any networks that may be interested www.health.org.uk/events/hype-...

06.01.2025 08:43 β€” πŸ‘ 55    πŸ” 20    πŸ’¬ 3    πŸ“Œ 4
Royal College of Anaesthetists
Centre for Research and Improvement
Director

Royal College of Anaesthetists Centre for Research and Improvement Director

The College is seeking applications for the position of Director of our Centre for Research and Improvement, which oversees delivery of all College research projects.

An exciting opportunity to play a vital role in our research and improvement work.

ow.ly/A47350UQfxx @rcoa-cri.bsky.social

30.01.2025 14:26 β€” πŸ‘ 5    πŸ” 5    πŸ’¬ 0    πŸ“Œ 0
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Severity of Impaired Oxygenation and Conservative... : Pediatric Critical Care Medicine 2% was associated with a shorter duration of organ support and greater survival, compared with Spo2 greater than 94%, in mechanically ventilated children following unplanned admission to PICU. We inve...

Post-hoc analysis of Oxy-PICU by baseline severity of gas exchange - no detectable heterogeneity of treatment effect.

journals.lww.com/pccmjournal/...

13.01.2025 15:01 β€” πŸ‘ 6    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0
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Longer-term survival, quality of life, and cost-effectiveness of conservative versus liberal oxygenation targets in critically ill children: a pre-specified analysis from Oxy-PICU, a multicentre, open... Peripheral oxygen saturation (SpO2) above 94% is typical in children in paediatric intensive critical care units (PICUs) who are receiving invasive ve…

1 year follow-up and health economics of Oxy-PICU.
All point estimates still favour conservative oxygenation but differences are not statistically significant with the slightly smaller sample size.

www.sciencedirect.com/science/arti...

18.12.2024 07:05 β€” πŸ‘ 5    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0

But seriously, while some of us care a lot about this, the evidence (not least the latest update to the Declaration of Helsinki) suggests others less so

28.01.2025 12:59 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0