To identify the pressure relieving effect of adding a pelvic well pad, a firm pad that is cut in the ischial area, to a wheelchair cushion on the ischium.
Medical records of 77 individuals with SCI, who underwent interface pressure mapping of the buttock-thigh area, were retrospectively reviewed. The pelvic well pad is a 2.5-cm thick firm pad and has a cut in the ischial area. Expecting additional pressure relief, it can be inserted under a wheelchair cushion. Subjects underwent interface pressure mapping in the subject's wheelchair utilizing the subject's pre-existing pressure relieving cushion and subsequently on a combination of a pelvic well pad and the cushion. The average pressure, peak pressure, and contact area of the buttock-thigh were evaluated.
Adding a pelvic well pad, under the pressure relieving cushion, resulted in a decrease in the average and peak pressures and increase in the contact area of the buttock-thigh area when compared with applying only pressure relieving cushions (p<0.05). The mean of the average pressure decreased from 46.10±10.26 to 44.09±9.92 mmHg and peak pressure decreased from 155.03±48.02 to 131.42±45.86 mmHg when adding a pelvic well pad. The mean of the contact area increased from 1,136.44±262.46 to 1,216.99±255.29 cm2.
When a pelvic well pad was applied, in addition to a pre-existing pressure relieving cushion, the average and peak pressures of the buttock-thigh area decreased and the contact area increased. These results suggest that adding a pelvic well pad to wheelchair cushion may be effective in preventing a pressure ulcer of the buttock area.
Citations
To investigate the effects of body mass composition and cushion type on seat-interface pressure in spinal cord injured (SCI) patients and healthy subjects.
Twenty SCI patients and control subjects were included and their body mass composition measured. Seat-interface pressure was measured with participants in an upright sitting posture on a wheelchair with three kinds of seat cushion and without a seat cushion. We also measured the pressure with each participant in three kinds of sitting postures on each air-filled cushion. We used repeated measure ANOVA, the Mann-Whitney test, and Spearman correlation coefficient for statistical analysis.
The total skeletal muscle mass and body water in the lower extremities were significantly higher in the control group, whilst body fat was significantly higher in the SCI group. However, the seat-interface pressure and body mass composition were not significantly correlated in both groups. Each of the three types of seat cushion resulted in significant reduction in the seat-interface pressure. The SCI group had significantly higher seatinterface pressure than the control group regardless of cushion type or sitting posture. The three kinds of sitting posture did not result in a significant reduction of seat-interface pressure.
We confirmed that the body mass composition does not have a direct effect on seat-interface pressure. However, a reduction of skeletal muscle mass and body water can influence the occurrence of pressure ulcers. Furthermore, in order to minimize seat-interface pressure, it is necessary to apply a method fitted to each individual rather than a uniform method.
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To assess the effects of backrest inclination of a wheelchair on buttock pressures in spinal cord injured (SCI) patients and normal subjects.
The participants were 22 healthy subjects and 22 SCI patients. Buttock pressures of the participants were measured by a Tekscan® pressure sensing mat and software while they were sitting in a reclining wheelchair. Buttock pressures were recorded for 90°, 100°, 110°, 120° and 130° seat-to-back angles at the ischial tuberosity (IT) and sacrococcygeal (SC) areas. Recordings were made at each angle over four seconds at a sampling rate of 10 Hz.
The side-to-side buttock pressure differences in the IT area for the SCI patients was significantly greater than for the normal subjects. There was no significant difference between the SCI patients and the normal subjects in the buttock pressure change pattern of the IT area. Significant increases in pressure on the SC area were found as backrest inclination angle was changed to 90°, 100° and 110° in the normal subjects, but no significant differences were found in the SCI patients.
Most of the SCI patients have freeform posture in wheelchairs, and this leads to an uneven distribution of buttock pressure. In the SCI patients, the peak pressure in the IT area reduced as the backrest angle was increased, but peak pressure at the SC area remained relatively unchanged. To reduce buttock pressure and prevent pressure ulcers and enhance ulcer healing, it can be helpful for tetraplegic patients, to have wheelchair seat-to-back angles above 120°.
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Method: Thirteen cases with stage IV pressure ulcers (according to the National Pressure Ulcer Advisory Panel, 1989) were enrolled for the study. Seven cases were treated with Ulmus and 6 cases were treated with wet gauze as a control group. The sizes and stages of pressure ulcers were evaluated every 2 week for 12 weeks.
Results: After 12 weeks, the size of pressure ulcers decreased from 78.17⁑47.77 cm3 to 8.14⁑13.17 cm3 (mean⁑S.D., n=7) in Ulmus treated group, whereas from 62.10⁑40.89 cm3 to 36.69⁑36.23 cm3 (mean⁑S.D., n=6) in wet gauze treated group. The size of pressure ulcers decreased more significantly (p＜0.05) in Ulmus treated group than wet gauze dressed group. Among seven cases treated by Ulmus, 2 cases completely healed, 3 cases improved to stage II, and 2 cases remained to stage IV, whereas among 6 cases treated by wet gauze, 1 cases improved to stage II, 1 case to stage III, and 4 cases remained to stage IV.
Conclusion: Ulmus was more effective in management of pressure ulcers than wet gauze. We suggest that Ulmus can be used as a useful method of conservative treatment for the stage IV pressure ulcers. (J Korean Acad Rehab Med 2003; 27: 899-905)
We studied a group of spinal cord injured patients, using two different mattresses, to analyze statistically the pressure measured over sacral area and skin changes developed on the dorsal skin surface of patients for specific duration of time.
Local pressure measured at sacral area and skin change score were lower on a Bazooka system than common hospital mattress. And the weight, BMI(Body Mass Index) and % IBW(Ideal Body Weight) of patients significantly correlated with the skin changes developed on the dorsal skin surface after lying on common hospital mattress for 2 hours. But skin changes developed after lying on a Bazooka system for 8 hours didn't correlate with these variables. Therefore a Bazooka system may be effective in the prevention of pressure ulcers for spinal cord injured patients.
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