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Ringed donut cushions are known to cause venous congestion and edema.
In a study of at-risk patients, ring cushions were found to be more likely to cause pressure ulcers than to relieve them1.
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References:
- Crewe RA. Problems of rubber ring nursing cushions and a clinical survey of alternative cushions for ill patients. Care Sci Pract 1987; 5(2): 9-11.
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