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Study identifier: NCT05996120 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Study on Optimal Temperature During Cardiopulmonary Bypass (THERMIC-4)

Condition: Ischemic Heart Disease · Valvular Heart Disease · Cardiovascular Diseases  ·  Sponsor: University of Leicester

PhaseNA
Planned participants100
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

In order to perform heart surgery, a machine called cardiopulmonary bypass (CPB), or more commonly known as a heart-lung machine, is used to maintain the circulation of oxygenated blood needed by the rest of the body and its organs. Historically, when a patient is connected to CPB, their body is cooled below the normal body temperature. This is known as hypothermia. This is because scientific studies have previously shown that reduced body temperature lowers metabolism and therefore offers more protection to the brain and other organs due to the reduced oxygen requirement. The evidence supporting this practice, however, has been challenged throughout the history of cardiac surgery, with studies supporting that normothermia, or normal body temperature, is a safe alternative. Despite this, the practice of hypothermia has persisted. Published data from a survey of 139 cardiac surgeons in the United Kingdom showed that 84% still routinely employ hypothermic CPB during surgery. To assess whether normothermic or hypothermic CPB is safer, a clinical trial requiring a large sample size and high recruitment rates will be required. Therefore, the investigators aim to assess firstly the feasibility of trial recruitment and allocation adherence in this study. 100 adults across 10 different cardiac surgery centres in the United Kingdom will be recruited to a multicentre feasibility randomised controlled trial comparing normothermia (active comparator) against hypothermia (control compar…

This description comes directly from the study's public registry record.

Talk to the study team

Gavin J Murphy, FRCS, MD, MBChB, BSc  ·  0116 258 3054  ·  gjm19@le.ac.uk

Ann Cheng, MBChB, MSc  ·  ann.cheng1@nhs.net

Always discuss trial participation with your own doctor first.

Locations (11)

Glenfield Hospital, University Hospitals of Leicester NHS TrustLeicester, Leicestershire, United KingdomRecruiting
Blackpool Victoria Hospital, Blackpool Teaching Hospitals NHS Foundation TrustBlackpool, United KingdomNot Yet Recruiting
University Hospitals Bristol and Weston NHS Foundation TrustBristol, United KingdomRecruiting
Castle Hill Hospital, Hull University Teaching Hospitals NHS TrustCottingham, United KingdomRecruiting
Golden Jubilee National Hospital, NHS Golden JubileeGlasgow, United KingdomRecruiting
King's College Hospital, King's College Hospital NHS Foundation TrustLondon, United KingdomRecruiting
Royal Brompton Hospital, Guy's and St Thomas' NHS Foundation TrustLondon, United KingdomNot Yet Recruiting
Harefield Hospital, Guy's and St Thomas' NHS Foundation TrustLondon, United KingdomNot Yet Recruiting
John Radcliffe Hospital, Oxford University Hospitals NHS Foundation TrustOxford, United KingdomRecruiting
Derriford Hospital, Plymouth University Hospitals NHS TrustPlymouth, United KingdomRecruiting
Northern General Hospital, Sheffield Teaching Hospitals NHS Foundation TrustSheffield, United KingdomRecruiting

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Source record: clinicaltrials.gov/study/NCT05996120