Comparing durations of antibiotic use after cardiac surgery
Official title: Multicentre, Adaptive, Double-blind, Three-arm, Placebo-controlled, Noninferiority Trial Examining Antimicrobial Prophylaxis Duration in Cardiac Surgery
Run by Monash University · NCT05447559 · Data updated 2026-11-12
This study is testing how long to give antibiotics after heart surgery to see which duration best prevents infections.
Quick facts
| Phase | Phase 4 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 9180 (estimated) |
| Sponsor | Monash University Academic / other |
| Locations | 27 sites (Dallas, Texas and 26 other locations) |
| Status | Recruiting |
| Started | February 7, 2023 |
| Main results expected | December 2027 |
| Study ends | June 2028 |
| Registry record updated | March 25, 2026 |
| Trial ID | NCT05447559 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are adult patients undergoing cardiac surgery involving a median sternotomy.
✕Probably not a fit
Patients under 18, those with severe comorbidities, or specific infections or allergies may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This multicentre, adaptive, double-blind, three-arm, placebo-controlled, randomised clinical trial aims to evaluate the effectiveness of different durations of intravenous cefazolin prophylaxis in preventing surgical site infections (SSI) in patients undergoing cardiac surgery. Participants will be assigned to one of three groups: receiving prophylaxis only during surgery, for 24 hours post-surgery, or for 48 hours post-surgery. The study will assess the incidence of SSI, healthcare-associated infections, and the economic and microbiological impacts of these different prophylaxis durations.
Why it matters
Potential benefit: If successful, this study could optimize antibiotic use and reduce the incidence of infections in cardiac surgery patients.
How similar studies have gone: Previous studies have shown varying success with antibiotic prophylaxis durations, making this approach both relevant and necessary for further exploration.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: \- Adult patients undergoing cardiac surgery involving a median sternotomy Exclusion Criteria: * Age \<18 years * American Society of Anesthesiology (ASA) 5 * Subjects with GFR \<40mL/min/1.73m2 or those requiring continuous renal replacement therapy, haemodialysis or peritoneal dialysis * Surgery for suspected or proven endocarditis or deep sternal wound infection * Documented cefazolin hypersensitivity * Documented methicillin resistant Staphylococcus aureus (MRSA) colonisation or infection in the 12-months prior to index surgery * Cardiac transplantation * Procedures involving insertion ventricular assist device or mechanical circulatory support device * Procedures not involving a median sternotomy * Patients previously enrolled and randomised to the CALIPSO trial
Where it's running
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Westmead Hospital
Sydney, New South Wales, Australia Recruiting -
The Prince Charles Hospital
Brisbane, Queensland, Australia Recruiting -
Princess Alexandra Hospital
Brisbane, Queensland, Australia Recruiting -
Royal Adelaide Hospital
Adelaide, South Australia, Australia Recruiting -
Flinders Medical Centre
Adelaide, South Australia, Australia Recruiting -
Flinders Private
Adelaide, South Australia, Australia Recruiting
Show 21 more locations
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Royal Hobart Hospital
Hobart, Tasmania, Australia Recruiting -
The Alfred Hospital
Melbourne, Victoria, Australia Recruiting -
The Royal Melbourne Hospital
Melbourne, Victoria, Australia Recruiting -
Austin Health
Melbourne, Victoria, Australia Recruiting -
Epworth HealthCare
Melbourne, Victoria, Australia Recruiting -
Cabrini Health
Melbourne, Victoria, Australia Recruiting -
Victorian Heart Hospital
Melbourne, Victoria, Australia Recruiting -
St John of God Subiaco Hospital
Perth, Western Australia, Australia Recruiting -
Fiona Stanley Hospital
Perth, Western Australia, Australia Recruiting -
St Vincent's Hospital
Melbourne, Australia Recruiting -
Halifax Infirmary
Halifax, Nova Scotia, Canada Recruiting -
Ijn
Kuala Lumpur, Malaysia Recruiting -
Christchurch Hospital
Christchurch, New Zealand Recruiting -
Waikato Hospital
Hamilton, New Zealand Recruiting -
Wellington Hospital
Wellington, New Zealand Recruiting -
UT Southwestern Medical Centre
Dallas, Texas, United States Not yet recruiting -
St George Hospital
Sydney, New South Wales, Australia Active not recruiting -
St Andrew's War Memorial Hospital
Brisbane, Queensland, Australia Active not recruiting -
Sir Charles Gairdner
Nedlands, Western Australia, Australia Not yet recruiting -
Ummc
Kuala Lumpur, Malaysia Not yet recruiting -
Wakefield Hospital
Wellington, New Zealand Not yet recruiting
Study contacts
- Principal investigator: Trisha Peel, MBBS GradCertRes FRACP PhD — Monash University
- Study coordinator: Paige Druce, MSc(Epi)
- Email: paige.druce@monash.edu
- Phone: 9903 0016
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.