MIST Ultrasound Therapy Compared to United Kingdom Standard Care for the Treatment of Non-healing Venous Leg Ulcers
Chronic venous leg ulcers (VLUs) impact negatively on patients' quality of life. Standard treatment in the UK for patients with VLUs is compression bandaging or stockings. The MIST ultrasound system is a noncontact device which delivers low frequency ultrasound through a gentle saline mist directed at a patient's wound. This study aims to determine whether the use of the MIST device used in combination with standard treatments can improve healing of VLUs compared to UK standard practice. This will be assessed by measuring any reduction in wound size in the two groups after receiving 8 weeks of either Standard Care once a week or MIST combined with Standard Care three times a week.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Pragmatic Randomised Controlled Trial of MIST Ultrasound Therapy Compared to UK Standard Care for the Treatment of Non-healing Venous Leg Ulcers.|
- Percentage Change in Wound Area [ Time Frame: Week 5 to 13 ] [ Designated as safety issue: No ]Wound area is measured weekly using a digital wound imaging device. The wound boundary is digitally traced by a blinded assessor. Percentage and actual change in wound area between start of treatment (week 5) and end of treatment (week 13) is evaluated.
- Actual Change in Wound Area [ Time Frame: Week 5 to 13 ] [ Designated as safety issue: No ]Wound area is measured weekly using a digital wound imaging device. The wound boundary is digitally traced by a blinded assessor. Percentage and actual change in wound area between start of treatment (week 5) and end of treatment (week 13) is evaluated.
- Change in Overall Health Related Quality of Life (HRQoL) From Week 1 (Start) and Week 13 (Exit) [ Time Frame: Week 1 (start) and week 13 (exit) ] [ Designated as safety issue: No ]
On the first and final visit participants were invited to complete a Cardiff Wound Impact Schedule (CWIS) a validated questionnaire designed to measure the impact of chronic wounds on patient health-related quality of life (HRQoL). The overall HRQoL question asks patients to rate their overall quality of life over the past week by circling a number between 0 and 10. Low scores indicate poor quality of life, and high score indicate good quality of life. Change in HRQoL was calculated by subtracting week 1 values from week 13 values.
CWIS has been validated in the following paper: Price and Harding (2004) The Cardiff Wound Impact Schedule: the development of a condition specific questionnaire to assess health-related quality of life in patients with chronic wounds. International Wound Journal 1(1):10-17
- Change in Ulcer Pain Between Week 5 (Randomisation) and Week 13 (Exit) [ Time Frame: Weeks 5 to 13 ] [ Designated as safety issue: No ]Pain was scored by each patient on a visual analogue score (VAS) from 0 to 100. A VAS score of 0 indicated no pain whilst a VAS score of 100 indicated worst possible pain. Change in pain scores were calculated by subtracting week 5 values from week 13 values.
- Incidence of Wound Infection [ Time Frame: Weeks 5 to 13 ] [ Designated as safety issue: No ]Median number of wound infections per patient (as demonstrated by clinical symptoms) from beginning of treatment (week 5) and end of treatment (week 13).
- Number of Non-serious Adverse Events in Each Group [ Time Frame: Week 5 to 13 ] [ Designated as safety issue: Yes ]Adverse events (AEs) were defined as any undesirable clinical occurrence in a subject whether it is thought to be related to the investigational device or not.
- Wound Recurrence Rate [ Time Frame: 90 days after time of healing ] [ Designated as safety issue: No ]Patients whose wound has healed (defined as 100% epithelialisation with no scab present) before or at the end of treatment will be asked 90 days after date of healing if their wound has remained closed.
|Study Start Date:||August 2012|
|Study Completion Date:||December 2013|
|Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Active Comparator: Standard Care
Standard treatment for VLUs is administered once a week, i.e. compression bandaging and non-adherent dressing, with debridement if required.
Other: Standard Care
Compression bandaging, non-adherent dressing, and debridement if required.
Experimental: MIST and Standard Care
MIST ultrasound therapy is applied for between 3 and 12 minutes (depending on wound size) 3 times a week in combination with standard treatment for VLUs of compression bandaging and non-adherent dressing change 3 times a week, with debridement as required.
Device: MIST ultrasound therapy
Low frequency, non-contact ultrasound system delivering therapeutic ultrasound via a fine saline mist to the wound bed.
Other Names:Other: Standard Care
Compression bandaging, non-adherent dressing, and debridement if required.
Venous leg ulcers (VLUs) are wounds which are often chronic and difficult to heal. VLUs affect between 1 and 3.2 people per 1000; they cause pain, reduced mobility and impact negatively on patients' quality of life (QoL). Standard treatment for patients with VLUs is the application of strong, sustained compression with bandages or stockings. This pragmatically-designed study aims to determine whether the use of a device called MIST used in combination with standard treatments can improve healing of VLUs compared to UK standard practice. It will also show whether the MIST regimen improves participants' QoL and reduces the incidence of infection.
The MIST ultrasound system is a non-contact device which delivers low-frequency ultrasound through a gentle saline mist directed at a patient's wound. Patients (over 18 years old) will be invited to take part in this study if they have had a VLU for 6 weeks or more, which measures between 5 and 100 cm^2, and is not infected. Participants with diabetes must show good blood glucose control, and those with underlying chronic disorders which may affect wound healing will be excluded.
All study participants will receive four weeks of standard treatment once a week at a single clinic at the Wound Healing Research Unit (WHRU), University Hospital of Wales. Patients whose wounds reduce by more than 40% during this time will be withdrawn from the study. Remaining patients will be randomly allocated to either the active group or the control group to receive a further eight weeks of treatment. Participants in the active group will receive treatment with the MIST device three times a week, as well as standard care (change of compression bandage and dressings) three times a week. The control group will receive UK standard care (which is dressing and compression bandage change at least once a week). The participants' ulcers will be measured and photographed once a week, and the wound characteristics will be assessed. Changes in participants' health related QoL will be assessed using a questionnaire at the beginning and end of the trial. Wound recurrence rates 90 days after the end of the treatment will be assessed by telephoning patients.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01671748
|Wound Healing Research Unit, Cardiff University|
|Cardiff, United Kingdom, CF14 4XN|
|Principal Investigator:||Keith G Harding, Professor||Wound Healing Research Unit, Cardiff University|