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Clinician Article

Oral versus intravenous antibiotics for bone and joint infections: the OVIVA non-inferiority RCT.



  • Scarborough M
  • Li HK
  • Rombach I
  • Zambellas R
  • Walker AS
  • McNally M, et al.
Health Technol Assess. 2019 Aug;23(38):1-92. doi: 10.3310/hta23380. (Original)
PMID: 31373271
Read abstract Read full text
Disciplines
  • Infectious Disease
    Relevance - 6/7
    Newsworthiness - 6/7
  • Internal Medicine
    Relevance - 6/7
    Newsworthiness - 6/7
  • Surgery - Orthopaedics
    Relevance - 6/7
    Newsworthiness - 6/7

Abstract

BACKGROUND: Management of bone and joint infection commonly includes 4-6 weeks of intravenous (IV) antibiotics, but there is little evidence to suggest that oral (PO) therapy results in worse outcomes.

OBJECTIVE: To determine whether or not PO antibiotics are non-inferior to IV antibiotics in treating bone and joint infection.

DESIGN: Parallel-group, randomised (1 : 1), open-label, non-inferiority trial. The non-inferiority margin was 7.5%.

SETTING: Twenty-six NHS hospitals.

PARTICIPANTS: Adults with a clinical diagnosis of bone, joint or orthopaedic metalware-associated infection who would ordinarily receive at least 6 weeks of antibiotics, and who had received = 7 days of IV therapy from definitive surgery (or start of planned curative treatment in patients managed non-operatively).

INTERVENTIONS: Participants were centrally computer-randomised to PO or IV antibiotics to complete the first 6 weeks of therapy. Follow-on PO therapy was permitted in either arm.

MAIN OUTCOME MEASURE: The primary outcome was the proportion of participants experiencing treatment failure within 1 year. An associated cost-effectiveness evaluation assessed health resource use and quality-of-life data.

RESULTS: Out of 1054 participants (527 in each arm), end-point data were available for 1015 (96.30%) participants. Treatment failure was identified in 141 out of 1015 (13.89%) participants: 74 out of 506 (14.62%) and 67 out of 509 (13.16%) of those participants randomised to IV and PO therapy, respectively. In the intention-to-treat analysis, using multiple imputation to include all participants, the imputed risk difference between PO and IV therapy for definitive treatment failure was -1.38% (90% confidence interval -4.94% to 2.19%), thus meeting the non-inferiority criterion. A complete-case analysis, a per-protocol analysis and sensitivity analyses for missing data each confirmed this result. With the exception of IV catheter complications [49/523 (9.37%) in the IV arm vs. 5/523 (0.96%) in the PO arm)], there was no significant difference between the two arms in the incidence of serious adverse events. PO therapy was highly cost-effective, yielding a saving of £2740 per patient without any significant difference in quality-adjusted life-years between the two arms of the trial.

LIMITATIONS: The OVIVA (Oral Versus IntraVenous Antibiotics) trial was an open-label trial, but bias was limited by assessing all potential end points by a blinded adjudication committee. The population was heterogenous, which facilitated generalisability but limited the statistical power of subgroup analyses. Participants were only followed up for 1 year so differences in late recurrence cannot be excluded.

CONCLUSIONS: PO antibiotic therapy is non-inferior to IV therapy when used during the first 6 weeks in the treatment for bone and joint infection, as assessed by definitive treatment failure within 1 year of randomisation. These findings challenge the current standard of care and provide an opportunity to realise significant benefits for patients, antimicrobial stewardship and the health economy.

FUTURE WORK: Further work is required to define the optimal total duration of therapy for bone and joint infection in the context of specific surgical interventions. Currently, wide variation in clinical practice suggests significant redundancy that likely contributes to the excess and unnecessary use of antibiotics.

TRIAL REGISTRATION: Current Controlled Trials ISRCTN91566927.

FUNDING: This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 23, No. 38. See the NIHR Journals Library website for further project information.

Treatment of bone and joint infection usually requires a long course of antibiotics. Doctors usually give these by injection through a vein (intravenously) for the first 4–6 weeks, rather than by mouth (orally). Although intravenous (IV) administration is more expensive and less convenient for patients, most doctors believe that it is more effective. However, there is little evidence to support this. The OVIVA (Oral Versus IntraVenous Antibiotics) trial set out to challenge this assumption. A total of 1054 patients from 26 UK hospitals were randomly allocated to receive the first 6 weeks of antibiotic therapy either intravenously or orally. Irrespective of the route of administration, the choice of antibiotic was left to an infection specialist so as to ensure that the most appropriate antibiotics were given. Patients were followed up for 1 year. Thirty-nine participants were lost to follow-up. Among the remaining 1015 participants, treatment failure occurred in 14.6% of those treated intravenously and 13.2% of those treated with PO antibiotics. This difference could easily have occurred by chance. Even if it was not by chance, the difference does not suggest that PO therapy is associated with worse outcomes than IV therapy and is too small to conclude that PO therapy is better than IV therapy. Participants in the IV group stayed in hospital longer and 10% of them had complications related to the IV line used for administering the antibiotics. In addition, their treatment was, overall, more expensive. We conclude that PO antibiotic therapy has no disadvantages for the early management of bone and joint infection. It is also cheaper and associated with fewer complications.


Clinical Comments

Infectious Disease

We keep learning that easier and shorter courses of antibiotics are usually as good as our "standard" regimens. This well done study from the UK shows that fewer than 15% of patients who receive an appropriate schedule of antibiotics experience failure in the first year following therapy. What is encouraging is that the numbers are the same in the IV and the PO group. This RCT of >1000 patients was sufficient to show non-inferiority. The potential advantages of oral therapy are evident, so it is potentially practice-changing to see that for most patients an oral option is equivalent to IV therapy. To be fair, this result should not be surprising for a number of reasons. We already knew that for many medications tissue levels with oral dosing are excellent. And patients who could not receive IV for a variety of reasons, did not have an unexpectedly high failure rate. I would be hard pressed to favor IV therapy for patients who can take PO and have good follow-up.

Infectious Disease

The study is helpful in laying the groundwork for treating bone and joint infections with PO antibiotics. However, there are significant limitations and further data in better designed RCTs are needed before this can become mainstream standard-of-care. A select few cases will definitely benefit from the results of this study.

Infectious Disease

A true “game changer.”

Internal Medicine

This would have a major impact on our hospital wards, particularly for IVDU patients.

Internal Medicine

As an internist, these results are unexpected and challenge current standard of care in the treatment of bone and joint infections. Replication of these results will change treatment guidelines and would be a cost-saving for healthcare systems.

Surgery - Orthopaedics

The authors performed a parallel-group, randomised (1:1) open-label trial to determine whether or not oral (PO) antibiotics are non-inferior to intravenous (IV) antibiotics in treating bone and joint infection. Patients with a clinical diagnosis of bone, joint, or orthopaedic metalware-associated infection who would ordinarily receive at least 6 weeks of antibiotics and who had received 7 days of IV therapy from definitive surgery were centrally computer-randomised to PO or IV antibiotics to complete the first 6 weeks of therapy. PO antibiotic therapy was non-inferior to IV therapy when used during the first 6 weeks in bone and joint infection, as assessed by definitive treatment failure within 1 year of randomisation. These findings challenge the current standard of care and provide an opportunity to realise significant benefits for patients, antimicrobial stewardship, and health economy.

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