Venous ulcers (also known as varicose or venous stasis ulcers) are a chronic, recurring
and debilitating condition that affects up to 1% of the population. Best practice
documents and expert opinion suggests that the removal of devitalised tissue from
venous ulcers (debridement) by any one of six methods helps to promote healing. However,
to date there has been no review of the evidence from randomised controlled trials
(RCTs) to support this. To determine the effects of different debriding methods or
debridement versus no debridement, on the rate of debridement and wound healing in
venous leg ulcers. In February 2015 we searched: The Cochrane Wounds Group Specialised
Register; The Cochrane Central Register of Controlled Trials (CENTRAL); Ovid MEDLINE;
Ovid MEDLINE (In‐Process & Other Non‐Indexed Citations); Ovid EMBASE and EBSCO CINAHL.
There were no restrictions with respect to language, date of publication or study
setting. In addition we handsearched conference proceedings, journals not cited in
MEDLINE, and the bibliographies of all retrieved publications to identify potential
studies. We made contact with the pharmaceutical industry to enquire about any completed
studies. We included RCTs, either published or unpublished, which compared two methods
of debridement or compared debridement with no debridement. We presented study results
in a narrative form, as meta‐analysis was not possible. Independently, two review
authors completed all study selection, data extraction and assessment of trial quality;
resolution of disagreements was completed by a third review author. We identified
10 RCTs involving 715 participants. Eight RCTs evaluated autolytic debridement and
included the following agents or dressings: biocellulose wound dressing (BWD), non‐adherent
dressing, honey gel, hydrogel (gel formula), hydrofibre dressing, hydrocolloid dressings,
dextranomer beads, Edinburgh University Solution of Lime (EUSOL) and paraffin gauze.
Two RCTs evaluated enzymatic preparations and one evaluated biosurgical debridement.
No RCTs evaluated surgical, sharp or mechanical methods of debridement, or debridement
versus no debridement. Most trials were at a high risk of bias. Three RCTs assessed
the number of wounds completely debrided. All three of these trials compared two different
methods of autolytic debridement (234 participants), with two studies reporting statistically
significant results: one study (100 participants) reported that 40/50 (80%) ulcers
treated with dextranomer beads and 7/50 (14%) treated with EUSOL achieved complete
debridement (RR 5.71, 95% CI 2.84 to 11.52); while the other trial (86 participants)
reported the number of ulcers completely debrided as 31/46 (76%) for hydrogel versus
18/40 (45%) for paraffin gauze (RR 0.67, 95% CI 0.45 to 0.99). One study (48 participants)
reported that by 12 weeks, 15/18 (84%) ulcers treated with BWD had achieved a 75%
to 100% clean, granulating wound bed versus 4/15 (26%) treated with non‐adherent petrolatum
emulsion‐impregnated gauze. Four trials assessed the mean time to achieve debridement:
one (86 participants) compared two autolytic debridement methods, two compared autolytic
methods with enzymatic debridement (71 participants), and the last (12 participants)
compared autolytic with biosurgical debridement; none of the results achieved statistical
significance. Two trials that assessed autolytic debridement methods reported the
number of wounds healed at 12 weeks. One trial (108 participants) reported that 24/54
(44%) ulcers treated with honey healed versus 18/54 (33%) treated with hydrogel (RR
(adjusted for baseline wound diameter) 1.38, 95% CI 1.02 to 1.88; P value 0.037).
The second trial (48 participants) reported that 7/25 (28%) ulcers treated with BWD
healed versus 7/23 (30%) treated with non‐adherent dressing. Reduction in wound size
was assessed in five trials (444 participants) in which two autolytic methods were
compared. Results were statistically significant in one three‐armed trial (153 participants)
when cadexomer iodine was compared to paraffin gauze (mean difference 24.9 cm², 95%
CI 7.27 to 42.53, P value 0.006) and hydrocolloid compared to paraffin gauze (mean
difference 23.8 cm², 95% CI 5.48 to 42.12, P value 0.01). A second trial that assessed
reduction in wound size based its results on median differences and, at four weeks,
produced a statistically significantly result that favoured honey over hydrogel (P
value < 0.001). The other three trials reported no statistically significant results
for reduction in wound size, although one trial reported that the mean percentage
reduction in wound area was greater at six and 12 weeks for BWD versus a non‐adherent
dressing (44% versus 24% week 6; 74% versus 54% week 12). Pain was assessed in six
trials (544 participants) that compared two autolytic debridement methods, but the
results were not statistically significant. No serious adverse events were reported
in any trial. There is limited evidence to suggest that actively debriding a venous
leg ulcer has a clinically significant impact on healing. The overall small number
of participants, low number of studies and lack of meta‐analysis in this review precludes
any strong conclusions of benefit. Comparisons of different autolytic agents (hydrogel
versus paraffin gauze; Dextranomer beads versus EUSOL and BWD versus non‐adherent
dressings) and Larvae versus hydrogel all showed statistically significant results
for numbers of wounds debrided. Larger trials with follow up to healing are required.
Debridement for venous leg ulcers Background Venous leg ulcers are a common type of
leg wound. They can cause pain, stress, social isolation and depression. These ulcers
take approximately 12 weeks to heal and the best and first treatment to try is compression
bandages. In an attempt to improve the healing process it is thought that removing
dead or dying tissue (debridement) from the surface of the wound can speed up healing.
Six different methods can be used to achieve debridement: use of an instrument such
as a scalpel (with or without anaesthesia ‐ surgical debridement and sharp debridement,
respectively); washing solutions and dressings (mechanical debridement); enzymes that
break down the affected tissue (enzymatic debridement); moist dressings or natural
agents, or both, to promote the wound's own healing processes (autolytic debridement);
or maggots (biosurgical debridement). Objectives We assessed evidence from medical
research to try to determine how effective these different methods of debridement
are in debriding wounds. We also wanted to understand what effect, if any, debridement
has on the healing of venous ulcers, and whether any method of debridement is better
than no debridement when it comes to wound healing. Search methods We searched a wide
range of electronic databases and also reports from conferences up to 10 February
2015. We included studies written in any language that included men and women of any
age, cared for in any setting, from any country, and we did not set a limit on the
years in which studies were published. We were only interested in robust research,
and so restricted our search to randomised controlled trials (in which people are
randomly allocated to the methods being tested). All trial participants were required
to have a venous ulcer with dead tissue (slough) present in the wound. Results We
found ten studies that included a total of 715 participants. These were conducted
in a range of countries and care settings. Participants had an average age of 68 years,
and there were more women than men. Most of the studies were small, with half of them
having fewer than 67 participants. The trials tested a range of debridement methods
including: autolytic methods such as non‐adherent dressings; very small beads; biocellulose
dressings; honey; gels; gauze and methods using enzymes. Autolytic methods of debridement,
were the most frequently tested. We identified no studies that tested surgical, sharp
or mechanical methods of debridement and no studies that tested debridement against
no debridement. It was not possible to say whether any of the methods evaluated performed
better than the rest. There was some evidence to suggest that sloughy ulcers that
had more than 50% of slough removed after four weeks were more likely to heal by 12
weeks; and some evidence to suggest that ulcers debrided using honey were more likely
to heal by 12 weeks than ulcers debrided with hydrogel. What remains uncertain at
this time is whether debridement itself, or any particular form of debridement is
beneficial in the treatment of venous ulcers. The overall quality of the evidence
we identified was low, as studies were small in size, and most were of short duration.
There were differences between them in terms of the amount of slough in the wound
bed of the ulcers at the start of the trial, in treatment regimes, the duration of
treatments, and the methods used to assess how well the debridement treatments had
worked. In six trials, the people assessing the wounds were aware of the type of treatment
each patient was receiving, which may have affected the impartiality of their evaluations.
Five studies did not provide information on all the results (outcomes) in their trials,
and this missing information on important benefits or harms of the debridement method
being evaluated meant that those trials were at a high risk of bias and of producing
unreliable results. Only two studies reported side effects due to the treatment; these
included maceration (or wetness) of the skin around the ulcers, infection and skin
inflammation.