Dr Tobias Wrenfield
Group Leader
Tobias is an anaesthetist and trialist. He leads the group’s work on pre-operative fitness and shared decision making.
Perioperative Outcomes Group
Better decisions before, during and after an operation.
- Studies
- 3
- People
- 3
- Contact
- [email protected]
About the group
We run pragmatic trials and audits across the surgical pathway, from pre-operative assessment to the first months at home.
Our people
Samuel Fenwright
Research Nurse
Samuel coordinates recruitment across the surgical wards and is often the first person participants meet.
Mei Aldous
PhD Candidate
Mei is studying how patients and surgeons weigh up risk when deciding whether to operate.
Our research
The studies listed on this page are run or led by the group. Each one is entered once and also appears on the matching theme pages.
In progressEthics TEST/2025/112
Deciding Together
Interviews with patients and surgeons about how the decision to operate is made.
RecruitingEthics TEST/2026/031
Fit for Surgery
A four-week home exercise and nutrition programme before major surgery.
RecruitingEthics TEST/2026/081
Talking About Pain Relief
Testing a plain-language guide, written with patients, to pain relief in the first week home after surgery.
Our publications
Selected papers, each with a summary in plain language, then the full list by year.
Home-based prehabilitation before major abdominal surgery: a pilot randomised trial
Wrenfield T, Fenwright S, Aldous M, et al. Example Perioperative Medicine, 2025. doi:10.5555/example.2025.014
In plain language
Sixty people did a four-week home exercise programme before surgery, or usual care. Most people finished the programme, and those who did walked further after surgery. A larger trial is now recruiting.
Pre-operative walking tests and length of stay
Wrenfield T, Fenwright S. Example Anaesthesia Reports, 2026. doi:10.5555/example.2026.103
In plain language
People who walked further in a six-minute test before surgery tended to go home sooner afterwards. A simple walking test could help teams plan support before an operation.
How patients talk about surgical risk: a qualitative study
Aldous M, Wrenfield T. Example Health Communication, 2025. doi:10.5555/example.2025.104
In plain language
We talked with 28 patients about how they understood the risks of their operation. Most wanted numbers explained in everyday words and time to talk with family before deciding.
2026
- Counting what connects: relationship metadata coverageJosiah Carberry, Hanako Yamada, Society of Metadata Idealists Working Group on Examples. , 2026. doi:10.32013/fel-2jq2nujxo
- Memory bus simulation scriptsCarberry, Josiah. Zenodo (CERN European Organization for Nuclear Research), 2026. doi:10.5281/zenodo.22692022
- Sample article: article digital dataset 8766Josiah Patel, Marco Carberry. Testing new deposit code, 2026. doi:10.5555/article-digital-dataset-8766-20260715155001
- When your cat is just too bigMinerva Housecat, Josiah Carberry. , 2026. doi:10.32013/almzjquvwfee
2025
- Are black cats better than other cats?Minerva Housecat, Josiah Carberry. , 2025. doi:10.32013/5n6x-65lp
- On the dashboard of textile recyclingÖmer Holt, Josiah Carberry, Valentín Fraser. Journal of Psychoceramics, 2025. doi:10.5555/testdata-journal-47rjd3
- Sample article: article digital dataset 1987Noah Carberry, Sam Brooks. Testing new deposit code, 2025. doi:10.5555/article-digital-dataset-1987-20260721114824
- Sample article: article global model 2881Noah Patel, Marco Carberry. Testing new deposit code, 2025. doi:10.5555/article-global-model-2881-20260710165316
- When your best metadata isn't good enough: working with an imperfect specificationMinerva Housecat, Josiah Carberry. , 2025. doi:10.32013/76bl-jdvj
2024
- Obese Cat CareMinerva Housecat, Josiah Carberry. , 2024. doi:10.32013/0jed-s6d4
- Testing Report MetadataJosiah Carberry. , 2024. doi:10.5555/trm01
- When your best metadata isn't good enough: working with an imperfect specificationMinerva Housecat, Josiah Carberry. , 2024. doi:10.32013/n338-2jwu
2023
- Global Illumination for Fun and Profit: VGTC Journal TemplateJosiah S. Carberry, Ed Grimley, Martha Stewart. OSF Preprints (OSF Preprints), 2023. doi:10.31219/osf.io/hgfqm
- Retraction notice for multiple articlesJosiah Carberry. Testing new deposit code, 2023. doi:10.5555/01235-10
2022
- A community-based study of student sleep patterns in mountain regionsAbigail Ibáñez, Léa Kühn, Josiah Carberry. Revista de Metadados Perfeitos, 2022. doi:10.5555/testdata-journal-aenphh
2021
- Awesome Book SeriesJosiah Carberry. Ranger Rick, 2021. doi:10.32013/92m.e-7
- Sample Set TitleMinerva Housecat, Josiah Carberry. Sample Publisher eBooks, 2021. doi:10.32013/ipdqrap
- This is a journal article titleMinerva Housecat, Josiah Carberry. Beadwork, 2021. doi:10.5555/characters1234
- This is a journal article titleMinerva Housecat, Josiah Carberry. Knitting purls, 2021. doi:10.5555/n0hrokm
- This is a journal article titleMinerva Housecat, Josiah Carberry. Knitting purls, 2021. doi:10.5555/n0hrokm11
- This is a journal article titleMinerva Housecat, Josiah Carberry. Knitting purls, 2021. doi:10.5555/n0hrokm111
2020
- An open study of metadata quality in small businessesJosiah Carberry, Amara Murphy. Journal of Psychoceramics, 2020. doi:10.32013/testdata-journal-4ppjbr
- Tissue-specific expression patterns of nuclear receptorsMinerva Housecat, Josiah Carberry. , 2020. doi:10.5555/np6qobh
- Worst Cat EverJosiah Carberry. The Journal Of Test Deposits, 2020. doi:10.5555/bg4ed
Publication list updated automatically from ORCID records on 10 November 2026.
News from this group
- Fit for Surgery opens to new participants
Our home prehabilitation trial is now recruiting at Tidewater Regional Hospital.