Cellulitis Optimal Antibiotic Treatment (COAT)
Primary Purpose
Cellulitis of Leg
Status
Not yet recruiting
Phase
Phase 3
Locations
Study Type
Interventional
Intervention
Flucloxacillin Only Product in Oral Dose Form
Placebo Only Product in Oral Dose Form
Sponsored by
About this trial
This is an interventional treatment trial for Cellulitis of Leg focused on measuring Primary care, Antibiotic treatment, Antibiotic resistance, Pain, Cost consequences
Eligibility Criteria
Inclusion Criteria:
- Must be aged 18 years or older
- Currently showing symptoms of cellulitis (such as pain, tenderness, redness, other change in skin color, warmth to touch) in one leg for 10 days or less
- Pain rated as 3/10 or higher on a numerical rating scale (0-10) at baseline assessment
- Be willing to be randomized to either trial arm (5-day or 7-day treatment)
- Able to complete trial procedures in the English language.
Exclusion Criteria:
- Have penicillin allergy
- Have bilateral cellulitis
- Have had antibiotics for cellulitis within the past month
- Have post-operative cellulitis (within 30 days of operative procedures on the same leg)
- Have cellulitis resulting from human/animal bite injury
- Have Cellulitis associated with chronic (>6 weeks) leg ulceration
- Require immediate hospital admission or out-patient intravenous antibiotic therapy
Sites / Locations
Arms of the Study
Arm 1
Arm 2
Arm Type
Placebo Comparator
Active Comparator
Arm Label
Intervention
Control
Arm Description
Flucloxacillin 500mg four times a day (QDS) for 5 days (unblinded NHS prescription) followed by blinded placebo QDS for 2 days (5 days of antibiotic)
Flucloxacillin 500mg QDS for 5 days (unblinded NHS prescription) followed by flucloxacillin 500mg QDS (blinded) for 2 days (7 days of antibiotic)
Outcomes
Primary Outcome Measures
Pain assessment
Self-reported pain (measured using the Pain Numeric Rating Scale (0-10))
Secondary Outcome Measures
Use of additional antibiotics
Any reported use of antibiotics other than the initial 5 days of flucloxacillin and 2 days of IMP)
Patient-reported assessment of how well they are feeling
Numeric rating scale NRS (0-10) and assessed as repeated measures
Health related quality of life
EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
Health related quality of life used to estimate Quality Adjusted- Life Years (QALYs)
EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
Leg swelling and warmth
Participant reported questionnaire
Time until self-reported recovery
Participant reported questionnaire
Time until self-assessed extent of cellulitis starts to reduce (with no subsequent increase)
Participant reported questionnaire
Hospital admissions
Number of hosptial admissions since randomisation, collected from primary care notes review
Recurrent cellulitis episodes over 12 months (number of episodes)
Recurrent cellulitis episodes over 12 months (number of episodes) since randomisation, collected from primary care notes review
Complications over 12 months
Number of reported complications since randomisation, collected from primary care notes review
Full Information
NCT ID
NCT05584007
First Posted
September 7, 2022
Last Updated
May 12, 2023
Sponsor
University of Southampton
Collaborators
University of East Anglia, University of Nottingham, Norfolk and Norwich University Hospitals NHS Foundation Trust, University Hospital Southampton NHS Foundation Trust
1. Study Identification
Unique Protocol Identification Number
NCT05584007
Brief Title
Cellulitis Optimal Antibiotic Treatment
Acronym
COAT
Official Title
A Blinded, Non-inferiority Phase III Trial of 5 Versus 7 Days of Oral Flucloxacillin in Primary Care Patients With Lower Limb Cellulitis
Study Type
Interventional
2. Study Status
Record Verification Date
May 2023
Overall Recruitment Status
Not yet recruiting
Study Start Date
June 1, 2023 (Anticipated)
Primary Completion Date
November 1, 2024 (Anticipated)
Study Completion Date
December 1, 2025 (Anticipated)
3. Sponsor/Collaborators
Responsible Party, by Official Title
Sponsor
Name of the Sponsor
University of Southampton
Collaborators
University of East Anglia, University of Nottingham, Norfolk and Norwich University Hospitals NHS Foundation Trust, University Hospital Southampton NHS Foundation Trust
4. Oversight
Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No
Product Manufactured in and Exported from the U.S.
No
Data Monitoring Committee
Yes
5. Study Description
Brief Summary
To determine whether a short course of oral flucloxacillin (5 days) is non-inferior to a standard course (7 days) in terms of pain over days 6-14 (indicative of persistence or recurrence associated with the symptoms of most importance to patients) in adults with cellulitis of the leg presenting in primary care.
Detailed Description
Cellulitis is a deep infection of the skin and subcutaneous tissues and most often occurs in the legs. It is a painful condition that is associated with inflammation and swelling of the site, and often systemic symptoms such as fever, headache, muscle aches, malaise, and fatigue. Patients report feeling unwell and that it has a significant impact on their mobility and ability to carry out their usual activities. NICE guidelines recommend oral flucloxacillin 500-1000 mg four times daily for 5-7 days as first-line treatment for most patients with cellulitis in the community, but most prescriptions are dispensed for a 7-day course. We will be assessing the effectiveness and safety of a 5-day treatment vs. the standard 7-day treatment. We also aim to evaluate the cost-consequences of a shorter course from an NHS and personal perspective. Participants will be randomly allocated to one of two groups. In addition to usual care, participants will either be assigned to a 5-day oral flucloxacillin course or a standard 7-day flucloxacillin course. Participants will be prescribed a 5-day course of oral flucloxacillin, and two additional tablets will be posted to the participants which will either be the antibiotic or a placebo tablet. Participants will be asked to fill out daily questionnaires and express their experiences with the shortened course and taking part in the trial.
6. Conditions and Keywords
Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Cellulitis of Leg
Keywords
Primary care, Antibiotic treatment, Antibiotic resistance, Pain, Cost consequences
7. Study Design
Primary Purpose
Treatment
Study Phase
Phase 3
Interventional Study Model
Parallel Assignment
Model Description
A phase III blinded, multi-center, non-inferiority trial assessing the effectiveness and safety of 5 days vs 7 days of oral flucloxacillin 500mg QDS for lower leg cellulitis, and to evaluate the cost-consequences of a shorter course from an NHS and personal perspective. Participants will be recruited in NHS primary care settings in England and Wales. We will primarily recruit through general practices but will explore the possibility of recruiting through out-of-the-hours and urgent care settings.
Masking
ParticipantCare ProviderInvestigatorOutcomes Assessor
Masking Description
To facilitate ease of recruitment and avoid treatment delay, participants will be provided with an NHS prescription for flucloxacillin 500mg QDS for the first 5 days. A blinded medication pack will be sent by next day delivery, containing flucloxacillin 500mg QDS, or matched placebo QDS for the final 2 days. Participants will be informed that the capsules in this pack may look different from the capsules they were taking on days 1-5. Participants experiencing significant clinical deterioration, as judged by their clinician, may have their antibiotic treatment changed or be prescribed additional antibiotic courses. Any changes or additional use of antibiotics will be recorded, and the patient and clinician will remain blinded unless unblinding is deemed necessary.
Allocation
Randomized
Enrollment
356 (Anticipated)
8. Arms, Groups, and Interventions
Arm Title
Intervention
Arm Type
Placebo Comparator
Arm Description
Flucloxacillin 500mg four times a day (QDS) for 5 days (unblinded NHS prescription) followed by blinded placebo QDS for 2 days (5 days of antibiotic)
Arm Title
Control
Arm Type
Active Comparator
Arm Description
Flucloxacillin 500mg QDS for 5 days (unblinded NHS prescription) followed by flucloxacillin 500mg QDS (blinded) for 2 days (7 days of antibiotic)
Intervention Type
Drug
Intervention Name(s)
Flucloxacillin Only Product in Oral Dose Form
Intervention Description
Patients will be prescribed flucloxacillin 500mg QDS for 5 days followed by blinded flucloxacillin 500mg for 2 days, reaching a total of 7 days of antibiotic treatment
Intervention Type
Drug
Intervention Name(s)
Placebo Only Product in Oral Dose Form
Intervention Description
Patients will be prescribed flucloxacillin 500mg QDS for 5 days followed by a blinded placebo for 2 days, reaching a total of 5 days of antibiotic treatment
Primary Outcome Measure Information:
Title
Pain assessment
Description
Self-reported pain (measured using the Pain Numeric Rating Scale (0-10))
Time Frame
Days 7-16
Secondary Outcome Measure Information:
Title
Use of additional antibiotics
Description
Any reported use of antibiotics other than the initial 5 days of flucloxacillin and 2 days of IMP)
Time Frame
Up to day 28
Title
Patient-reported assessment of how well they are feeling
Description
Numeric rating scale NRS (0-10) and assessed as repeated measures
Time Frame
Days 6-14
Title
Health related quality of life
Description
EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
Time Frame
Days 6-14
Title
Health related quality of life used to estimate Quality Adjusted- Life Years (QALYs)
Description
EQ-5D-5L - values, and individual dimension (mobility, self-care, usual activities, pain/discomfort, anxiety/depression) level scores using repeated measures.
Time Frame
Days 6-14
Title
Leg swelling and warmth
Description
Participant reported questionnaire
Time Frame
Day 7, 14, 21, 28
Title
Time until self-reported recovery
Description
Participant reported questionnaire
Time Frame
Day 7, 14, 21, 28
Title
Time until self-assessed extent of cellulitis starts to reduce (with no subsequent increase)
Description
Participant reported questionnaire
Time Frame
Day 7, 14, 21, 28
Title
Hospital admissions
Description
Number of hosptial admissions since randomisation, collected from primary care notes review
Time Frame
12 months
Title
Recurrent cellulitis episodes over 12 months (number of episodes)
Description
Recurrent cellulitis episodes over 12 months (number of episodes) since randomisation, collected from primary care notes review
Time Frame
12 months
Title
Complications over 12 months
Description
Number of reported complications since randomisation, collected from primary care notes review
Time Frame
12 months
10. Eligibility
Sex
All
Minimum Age & Unit of Time
18 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria:
Must be aged 18 years or older
Currently showing symptoms of cellulitis (such as pain, tenderness, redness, other change in skin color, warmth to touch) in one leg for 10 days or less
Pain rated as 3/10 or higher on a numerical rating scale (0-10) at baseline assessment
Be willing to be randomized to either trial arm (5-day or 7-day treatment)
Able to complete trial procedures in the English language.
Exclusion Criteria:
Have penicillin allergy
Have bilateral cellulitis
Have had antibiotics for cellulitis within the past month
Have post-operative cellulitis (within 30 days of operative procedures on the same leg)
Have cellulitis resulting from human/animal bite injury
Have Cellulitis associated with chronic (>6 weeks) leg ulceration
Require immediate hospital admission or out-patient intravenous antibiotic therapy
12. IPD Sharing Statement
Plan to Share IPD
No
IPD Sharing Plan Description
Data from all centers will be analyzed together and published as soon as possible.
Planned publication of the results in a high-impact peer-reviewed journal. Planned publication of protocol in a peer-review journal. The datasets generated and/or analyzed during the current study will be published as a supplement to the publication of the results. Individual investigators may not publish data concerning their patients that are directly relevant to questions posed by the trial until the Trial Management Group (TMG) has published its report. The TMG will form the basis of the Writing Committee and advise on the nature of publications.
Learn more about this trial
Cellulitis Optimal Antibiotic Treatment
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