Preventing Wound Dehiscence: Tension-Relieving and Closure

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Preventing Wound Dehiscence: Tension-Relieving and Closure NOVEMBER 2005 VOL 7.10 Peer Reviewed Editorial Mission Preventing Wound To provide busy practitioners with concise, peer-reviewed recommendations on current treatment standards drawn from Dehiscence: Tension-Relieving published veterinary medical literature. and Closure Options Michael M. Pavletic, DVM, DACVS This publication acknowledges that Director of Surgical Services standards may vary according to individual Angell Animal Medical Center experience and practices or regional Boston, Massachusetts differences. The publisher is not responsible ncisional skin tension is noted by the relative lack of elastic skin bordering the for author errors. surgical site. On digital examination, the skin is taut and shows little or no mobility Reviewed 2015 for significant advances Iwhen pressed. Skin closures under these circumstances have a greater risk of failure, although determining the probability of failure on a clinical basis is inexact. in medicine since the date of original Many skin wounds are routinely sutured under variable degrees of skin tension; a publication. No revisions have been portion of such closures is destined to separate or undergo wound dehiscence. On the made to the original text. lower extremities, closure of skin wounds under tension can result in distal limb edema secondary to circulatory compromise and lymphatic stasis. Without prompt intervention, significant tissue necrosis may occur. Editor-in-Chief The skin of dogs and cats varies both in thickness and elasticity. On the trunk, Douglass K. Macintire, DVM, MS, the skin is thickest dorsally and progressively thins in a ventral direction. The skin DACVIM, DACVECC along the inner aspect of the extremities tends to be thinner than the lateral skin surface areas. Closure can be more problematic in areas subject to repeated movement. Editorial Review Board Skin over bony prominences is particularly susceptible to dehiscence from shearing Mark Bohling, DVM and compressive forces; under these conditions, sutures may serrate through the skin University of Tennessee (suture cutout) unless preventive measures are taken. A variety of techniques may be used to reduce incisional skin tension and the complications associated with Harry W. Boothe, DVM, DACVS dehiscence. Auburn University Skin has remarkable viscoelastic properties, which allow it to stretch and conform Derek Burney, DVM, PhD, DACVIM to tension forces. This “inherent elasticity of skin” is demonstrated by grasping and Houston, TX lifting the tissue. It is recognized that skin can stretch beyond its natural elasticity when a stretching or expansion force is applied over time. “Mechanical creep” and Joan R. Coates, DVM, MS, DACVIM “stress relaxation” account for the phenomenon in which skin can continue to stretch University of Missouri and accommodate prolonged application of tension forces, which can prevent Curtis Dewey, DVM, DACVIM, DACVS dehiscence for some wounds closed under moderate tension (e.g., wounds closed Plainview, NY under tension that have notably less incisional tension the day after surgery). Mechanical creep and stress relaxation occur as intradermal collagen fibers progressively Nishi Dhupa, DVM, DACVECC align and compact parallel to tension (or underlying expansion) forces applied to the Cornell University skin over time. As collagen fibers deform, tissue fluid and the surrounding mucopoly- D. Michael Tillson, DVM, MS, DACVS saccharide molecules are slowly displaced. This process can be accelerated with skin Auburn University stretching devices. Management of skin tension is critical for the successful closure of skin wounds. Dehiscence increases the risk associated with infection. Open wound management and subsequent attempts at wound closure can result in significant escalation of medical and surgical costs to the owner. NOVEMBER 2005 VOL 7.10 DIAGNOSTIC CRITERIA Historical Information • Cases include closure of open wounds secondary to trauma and elective surgical procedures, including tumor removal. • Lower extremity wounds may be especially troublesome because of the limited circumferential skin available for primary wound closure. Closure of wounds under circumferential skin tension can create a “biologic tourniquet,” resulting in distal limb edema and necrosis secondary to circulatory and lymphatic compromise unless promptly treated. • Some breeds are more prone to problematic wound closure, including sight hounds (e.g., greyhounds, whippets) and small dogs with limited skin. • Obese dogs and cats normally have less mobile skin available FIGURE 1. Skin tension can be minimized by making incisions like for primary wound closure. the stripes on a tiger. (From: Ogilvie GK, Moore AS: Managing the • Thin, delicate skin wounds closed under tension are more Veterinary Cancer Patient. Yardley, PA, Veterinary Learning Systems, susceptible to dehiscence compared with similar wounds on 1995, p 2; used with permission) thicker skin. • Wound closure over bony prominences (e.g., pressure sores) can be problematic, especially in larger dogs when prolonged Other Diagnostic Findings compressive and shearing forces are concentrated on these • In the presence of infection, a representative sample should anatomic sites. Debilitated dogs are prone to pressure sores be submitted for aerobic culture and sensitivity testing. as a result of improper nursing care. • Debilitated or malnourished animals and patients with Summary of Diagnostic Criteria Cushing’s disease are more prone to delayed healing and • A complete physical examination should be performed on all wound dehiscence. patients. • Licking, pawing, and rubbing of wounds closed under • Debilitated, sick, and malnourished animals require additional tension can increase the probability of dehiscence. In many diagnostic testing and supportive care. cases, wounds closed under tension are uncomfortable and • Open wounds should be assessed for the availability of loose patients will attempt to lick or chew the area. elastic skin to close the defect. Traumatized skin may be contused or swollen, and the elastic retraction of skin Physical Examination Findings margins may further reduce the availability of sufficient skin • At the time of wound closure, there is little or no natural skin for closure under minimal tension. laxity: Grasping, lifting, or pushing the skin toward the • In the presence of infection, bacterial cultures should be wound reveals limited movement. Lateral skin margins may submitted. be digitally apposed only with significant effort. • Skin tension varies according to body region and skin • Skin defects resulting from trauma may have significant thickness. swelling or contusions; edema causes dermal collagen fibers • Skin tension differs among breeds and individual patients. to separate, which reduces skin elasticity. Elastic retraction of • Closure of wounds under tension may prompt patients to the skin margins is exaggerated in the presence of significant lick or chew the area. inflammation. • After examination of the wound and neighboring skin, Diagnostic Differentials primary wound closure may be determined to be problematic • Increased skin tension may be exaggerated by edema and (e.g., closure would compromise normal ambulation or range secondary elastic retraction of the skin margins at the time of of motion). wound assessment. • Tumor resection with appropriate surgical margins may result Laboratory Findings in problematic wound closure. • Laboratory findings are normal in most patients. • Intra- and postoperative edema may further aggravate • Malnourished, sick, and debilitated patients require a incisional tension. detailed workup, including a baseline serum chemistry • Postoperative accumulation of blood (hematoma) or serum profile, complete blood count, and urinalysis. (seroma) can enhance overlying skin tension. • Patients suspected of having Cushing’s disease require further • Postoperative self-mutilation can result in additional swelling diagnostic testing, including a corticotropin response test. and suture line failure. 2 NOVEMBER 2005 VOL 7.10 TREATMENT RECOMMENDATIONS C H E C K P O I N T Initial Treatment Technique selection varies according to individual experience and • Skin tension should be assessed before surgery. The lines of personal preference. tension around a prospective surgical area can be determined (Figure 1). Neighboring skin can be “lifted and shifted” to help determine the best option to close the wound. They are least effective for mid- to lower extremity skin • The options for shifting apposing skin borders in different defects. positions should be assessed to take advantage of local and • Walking sutures have been advocated to reduce incisional regional skin elasticity to facilitate suture closure. tension when closing large wounds. • In open wounds, the degree of soft tissue trauma in the area should be assessed. Because edema and elastic retraction Supportive Treatment of the skin exaggerate wound size assessment and closure, • Bandages, splints, and slings can restrict motion to prevent open wound management may be advisable initially (delayed dehiscence and trauma that may further aggravate incisional closure). tension. • Resolution of edema and skin contusions (usually within 5 to • Successful closure of pressure sores requires protective 7 days) facilitates closure: Skin can regain much of its normal padding around the closure site. Soft, padded bedding, inherent elasticity, which improves the likelihood of success- including sheepskin, is important to prevent dehiscence
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