A Retrospective Data Analysis of Antimicrobial Dressing Usage in 3,084 Patients

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Author(s): 
Caroline E. Fife, MD; Marissa J. Carter, PhD, MA; David Walker, CHT; and Brett Thomson, BS

Abstract: Knowledge about practice patterns and optimal usage criteria for topical antimicrobial dressings is limited. A retrospective data analysis was conducted to evaluate: 1) the length of time these dressings are applied in a typical episode of wound care, 2) the number of episodes of antimicrobial dressing use, and 3) whether antimicrobial dressings are applied in consideration of signs and symptoms of infection. Wound care registry data from a level-4 electronic medical record were analyzed, providing information on 3,084 patients older than 17 years seen from July 2003 through December 2008 in 26 hospital-based, outpatient wound centers in 14 states. The 5,541 recorded wounds ranged in size from 0.3 to 225 cm2. One antimicrobial dressing use episode was recorded for 71% of wounds (4.7% had four or more). Mean treatment episode length was 32.5 days (median 21 days). Clinicians used these dressings for a longer period of time if patients had multiple comorbidities (P = .0001), a refractory wound (P <.00001), or were prescribed oral antibiotics (P <.0002); first dressing use was more common in wounds with signs and symptoms of infection (P <.00001). During an average of 16 (median 10) visits and a follow-up time of 269 days, 61.4% of wounds healed (range 42.2% for flaps or grafts to 67.9% for surgical wounds of all 5,541 wounds). Antimicrobial dressing use for 2 to 4 weeks was associated with a higher proportion of healed wounds, but in wounds that healed, longer dressing use was associated with a longer healing time. The practice pattern observed suggests that antimicrobial dressing usage generally is based on patient and wound assessment variables but prospective studies are needed to develop optimal guidelines of care.



Potential Conflicts of Interest: Dr. Fife has received speaker honoraria from KCI® (San Antonio, TX) and Organogenesis, Inc (Canton, MA) and is a major shareholder in Intellicure, Inc.™ (The Woodlands, TX). Dr. Carter has received speaker honoraria from Hollister Wound Care, LLC (Libertyville, IL). Mr. Walker owns stock in and Mr. Thomson is employed by Intellicure, Inc.



Please address correspondence to: Caroline E. Fife, MD, Department of Medicine, Division of Cardiology, The University of Texas Health Science Center, 6431 Fannin, MSB, Houston, TX 77030; email: Caroline.E.Fife@uth.tmc.edu.



     In recent years, the use of antimicrobial dressings that do not contain antibiotics — whether ointments, gels, or impregnated dressings — has increased.1-8 Preclinical studies suggest that when active agents, such as ionic silver, can be released over a period of time at steady concentrations, the likelihood of cytotoxicity is decreased, reducing possible impairment of wound healing while achieving a more constant antimicrobial effect to reduce bacterial growth.1,2 Iodophors (eg, povidone-iodine and cadexomer-iodine, ionic silver, chlorhexidine, and polyhexamethylene-biguanide) are some of the most commonly used antimicrobials,3-8 but the evidence for their efficacy in terms of improving wound healing is limited. Specifically, the sample size of many relevant randomized controlled trials (RCTs) has been small (<140 patients), follow-up is short (≤6 weeks), and evidence about some wound-healing outcomes, such as complete wound healing or time to heal, is frequently lacking although results of recent meta-analyses9,10 of silver-impregnated dressings suggest they improve wound healing and reduce odor, wound pain, and exudate compared to other protocols of care.

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