We evaluated the ability of Dermagraft (Advanced Tissue Sciences, La Jolla, Calif.), a living tissue analog that is composed of human neonatal fibroblasts, which are grown on a polyglactin acid Vicryl mesh (Ethicon Inc., Somerville, N.J.), to function as a dermal replacement when placed beneath meshed, expanded split-thickness skin grafts (MESTSGs). Full-thickness burn wounds in 17 patients with burns (mean age, 31 years; range, 6 to 69 years; mean burn size, 23.8% total body surface area) were excised to subcutaneous fat (nine patients), to fascia (three patients), or to a combination of deep dermis and fat (five patients). Dermagraft was placed over the experimental sites, which were then covered with MESTSGs. Paired control sites on each patient received MESTSGs only. The results showed that "take" of MESTSGs on control sites was slightly better than take on experimental sites that contained the Dermagraft; however, the differences were not statistically significant. Mesh interstices epithelialized over the surface of the full-thickness wound (control sites) or over the surface of Dermagraft (experimental sites). Wound biopsy specimens demonstrated no evidence of rejection of the cultured allogeneic fibroblasts and minimal inflammatory reaction to the Vicryl fibers. Evidence of continuous basement membrane formation at the epithelial-Dermagraft junction, which was identified by immunohistochemical staining for laminin and type IV collagen, was seen by day 14 beneath the healed epithelium in the skin graft interstices. The Vicryl fibers were hydrolyzed in the wound over a 2-to-4-week period, although some expulsion of fibers occurred as the healing epithelium advanced to close the MESTSG interstices. Elastic fibers were not seen in neodermal tissue in either control or experimental wounds at periods of up to 1 year after grafting. Further trials with this living tissue replacement are in progress.

Adolescent↗

PubMedDate not supplied

The use of biobrane II and specialty airflow beds (FluidAir Plus and Kinair for effective coverage of extensive posterior donor site wounds.

Posterior skin graft donor sites furnish large areas of skin for wound coverage, but the sites frequently are management problems. The wounds tend to become moist and to develop excessive drainage and fluid accumulation that may interfere with adherence of dressings, including our preferred donor site dressing, Biobrane II (red label, large pore). We studied the use of specialty airflow beds for improving the outcome of posterior donor sites. We evaluated 50 patients aged 1 to 69 years (mean 29.45 years) with posterior skin graft donor sites of the back, thigh, or buttocks that were covered with Biobrane II. Sites ranged in size from 3% to 13% body surface area (mean 8.34%). Forty patients were placed on a FluidAir Plus bed, and 10 were placed on air-filled pillow therapy beds (five on KinAir III, five on Therapulse) (Kinetic Concepts, Inc.) All patients were kept in the supine position. We evaluated six criteria: drainage, fluid accumulation under Biobrane, infection, days until Biobrane separated, days until epithelialization, and days of specialty bed usage. We related these criteria to nursing-care actions that interfere with airflow and prevent the drying action of the bed, such as use of a "linen saver" under the patient in the area of the donor site, a foam wedge under the back, and dressings applied over the Biobrane. Most donor sites had no complications. Donor site infections developed in six patients. Five of these patients had fluid accumulation under the Biobrane, necessitating early removal. Fluid accumulated under the Biobrane in 21 patients; nine of these incidences were related to a nursing-care action that impeded airflow.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMedDate not supplied

Wound healing in partial-thickness burn wounds treated with collagenase ointment versus silver sulfadiazine cream.

During burn care the wounds must be repeatedly debrided of adherent and loose debris until the decision is made to surgically excise and graft the wound or to await epithelialization. Though native proteolytic enzymes in the skin or those produced by colonizing bacteria can speed eschar separation, the use of exogenous enzymes for wound debridement may accelerate wound cleaning and healing. Collagenase digests native and denatured collagen in necrotic tissue. This multicenter trial of 79 patients with partial-thickness wounds compared the efficacy of collagenase ointment applied with polymyxin B sulfate/bacitracin powder with the efficacy of standard topical antimicrobial therapy (control) in which silver sulfadiazine cream (1%) was used to debride paired burn sites. Patients selected for the study had two noncontiguous, partial-thickness, comparably sized, and anatomically similar burn wounds. Ages of patients ranged from 5 to 60 years (mean 33 years). The total body surface area burned ranged from 2% to 30% (mean 13.6%). Mean burn sizes used for study treatment were 366 cm2 (26 to 2310 cm2) for collagenase sites and 355 cm2 (26 to 2394 cm2) for control sites. Sites on each patient were randomly assigned to treatment with either collagenase or control. Endpoints were time to clean wound bed (absence of retained debris) and time to healing (complete epithelialization). The sites treated with collagenase cleaned in less time (mean 9.3 days) than the control sites (mean 11.6 days). Similarly the collagenase sites healed faster than the control sites (mean 19 vs 22.1 days).(ABSTRACT TRUNCATED AT 250 WORDS)

Administration, Topical↗

PubMedDate not supplied

Management of skin-grafted burn wounds with Xeroform and layers of dry coarse-mesh gauze dressing results in excellent graft take and minimal nursing time.

The goals of postoperative treatment for split-thickness skin grafts (STSGs) are to maintain graft integrity, prevent graft and wound desiccation, and minimize infections. As we documented in a telephone survey of 16 burn centers, dressings for skin grafts usually consist of multiple layers of coarse-mesh gauze; the dressings receive frequent applications of aqueous solutions that contain antimicrobial agents to control bacterial growth and to maintain a moist environment at the wound surface. We prospectively studied the efficacy of our standard dressing of one layer of Xeroform (Kendall Inc., Mansfield, Mass.), which consists of fine-mesh gauze impregnated with bismuth tribromophenate, applied to the STSG surface followed by layers of dry gauze dressings wrapped in Kerlix (Kendall Inc.); the entire dressings were left intact until postoperative day 5. We evaluated 142 STSGs on 100 patients, mean age 29.2 years (range 0.3 to 79 years), with burns of 0.5% to 60% total body surface area (mean 9.1%). Meshed or sheet STSGs of 0.5% to 18% total body surface area (mean 3.14%) were placed on deep partial- or full-thickness excised wounds. Xeroform, followed by coarse-mesh gauze dressing, was applied after skin grafts were completed. The entire dressing was left intact until the initial takedown-to-graft at 5 days. Patients' grafts were evaluated on postoperative day 5 for the percentage of "take" and subgraft fluid collected; this evaluation was then repeated every other day for 10 days. On postoperative day 5 evaluations, mean skin graft take in all patients was 98.54% +/- 0.72%. Xeroform and coarse-mesh gauze dressings used to cover STSGs and left intact for 5 days until the initial dressing change, resulted in highly successful graft outcomes, with minimal postoperative nursing care compared with other dressing methods for skin grafts.

Adolescent↗

PubMedDate not supplied

Safety and efficacy of TransCyte for the treatment of partial-thickness burns.

Standard treatment for extensive partial-thickness burns in the United States and in much of the world involves the application of topical antimicrobial agents and repetitive wound débridements and dressing changes. We evaluated a new biologic wound covering, TransCyte (Advanced Tissue Sciences, La Jolla, Calif, formerly marketed as Dermagraft-Transitional Covering), for the treatment of partial-thickness burns. This material is composed of human newborn fibroblasts which are then cultured on the nylon mesh of Biobrane (Dow B. Hickam, Inc, Sugarland, Tex); the thin silicone membrane bonded to the mesh provides a moisture vapor barrier for the wound. A prospective, randomized, comparison study of silver sulfadiazine and TransCyte was performed with the use of paired wound sites on 14 patients. Wounds treated with TransCyte healed more quickly (mean 11.14 days to 90% epithelialization vs 18.14 days, P = .002). A noncomparison evaluation was then done for an additional 18 patients, and it confirmed excellent wound healing and an absence of infections. There were no infections in the 32 wound sites treated with TransCyte. In the first study group, late wound evaluations (3, 6, and 12 months postburn) were performed with use of the Vancouver Scar Scale. The results indicated that wound sites treated with TransCyte healed with less hypertrophic scarring than sites treated with silver sulfadiazine (P < .001 at 3 and 6 months, P = .006 at 12 months).

Adolescent↗

PubMedDate not supplied

Manipulation for chronic neck pain. A double-blind controlled study.

Twenty-one with symptomatic cervical spondylosis or nonspecific neck pain were given an amnesic dose of diazepam before manipulation of the cervical spine. Eighteen patients served as controls and also received diazepam but no manipulation. Results were obtained in a randomized, double-blind fashion. Statements of outcome by patients and mean visual analog scales for pain and activity showed no significant differences between manipulation and control groups, though both tests favored manipulation. Control subjects subsequently treated by manipulation showed no consistent favorable response. Questionnaires dealing with personality, life events, social and medical histories, etc., provided no correlations with outcome, nor did radiographic findings. Diffuse local tenderness correlated with high pain scores after treatment. The authors conclude that the value of a single manipulation of the cervical spine has not been established and that further exploration of indications is needed. The use of intravenous diazepam should be considered because it allows a double-blind experimental design.

Adult↗

PubMedDate not supplied

Non-invasive assessment of left ventricular function in coronary artery disease by Doppler stress testing.

Left ventricular (LV) function in 62 patients presenting with chest pain typical of angina was studied non-invasively at rest and at maximum-tolerated supine exercise using the continuous-wave Doppler technique of transcutaneous aorto-velography (TAV). The signals were analysed to derive peak velocity (Vp), systolic velocity integral [an index of stroke volume or stroke distance (Sd)], and minute distance (Md; index of cardiac output = Sd X heart rate). Comparison was made with results obtained from 66 normal volunteers. The percentage change in stroke distance with exercise (% delta Sd) was significantly related to the resting ejection fraction (EF) calculated from left ventriculography (r = 0.84), and was below 6% (lowest value observed in normal volunteers) in all of the 23 patients with coronary artery disease (CAD) whose EF was below 60%. No significant difference was observed in the % delta Sd between normal individuals and the 12 patients presenting with chest pain but who had normal coronary arteriograms. However, the % delta Vp, delta % Sd and % delta Md in the 50 patients with CAD were significantly lower than the normal individuals and the 12 patients with normal coronary arteriograms. Lower TAV measurements were observed with exercise, rather than at rest, with increasing number of coronary arteries with significant stenoses and the presence of history of myocardial infarction (linear trend p less than 0.003). These results suggest that Doppler recording of aortic blood velocity with exercise is a clinically useful non-invasive technique for studying LV performance in patients with CAD.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMedDate not supplied

Non-invasive assessment of changes in aortic blood velocity and its derivatives with exercise in normal subjects by Doppler ultrasound.

Using the continuous-wave Doppler technique of transcutaneous aortovelography (TAV), aortic blood velocity was measured in 66 normal individuals at rest and during maximum voluntary supine exercise. Stroke distance (the systolic velocity integral: a measure of stroke volume), minute distance (a measure of cardiac output=stroke distance times heart rate) and peak velocity increased significantly with exercise, but flow time shortened slightly. Stroke distance was found to rise to a plateau of 24% above the resting value at low work rates during exercise. This relatively undemanding noninvasive technique for measuring haemodynamic response to physiological stress may prove valuable in the assessment of left ventricular function. Our results in normals are consistent with findings by other techniques and provide a basis for clinical comparisons.

Adolescent↗