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Causal pathways for incident lower-extremity ulcers in patients with diabetes from two settings.

  1. G E Reiber,
  2. L Vileikyte,
  3. E J Boyko,
  4. M del Aguila,
  5. D G Smith,
  6. L A Lavery and
  7. A J Boulton
  1. Department of Health Services, University of Washington, Seattle, USA. greiber@u.washington.edu
    Diabetes Care 1999 Jan; 22(1): 157-162. https://doi.org/10.2337/diacare.22.1.157
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    Abstract

    OBJECTIVE: To determine the frequency and constellations of anatomic, pathophysiologic, and environmental factors involved in the development of incident diabetic foot ulcers in patients with diabetes and no history of foot ulcers from Manchester, U.K., and Seattle, Washington, research settings. RESEARCH DESIGN AND METHODS: The Rothman model of causation was applied to the diabetic foot ulcer condition. The presence of structural deformities, peripheral neuropathy, ischemia, infection, edema, and callus formation was determined for diabetic individuals with incident foot ulcers in Manchester and Seattle. Demographic, health, diabetes, and ulcer data were ascertained for each patient. A multidisciplinary group of foot specialists blinded to patient identity independently reviewed detailed abstracts to determine component and sufficient causes present and contributing to the development of each patient's foot ulcer. A modified Delphi process assisted the group in reaching consensus on component causes for each patient. Estimates of the proportion of ulcers that could be ascribed to each component cause were computed. RESULTS: From among 92 study patients from Manchester and 56 from Seattle, 32 unique causal pathways were identified. A critical triad (neuropathy, minor foot trauma, foot deformity) was present in > 63% of patient's causal pathways to foot ulcers. The components edema and ischemia contributed to the development of 37 and 35% of foot ulcers, respectively. Callus formation was associated with ulcer development in 30% of the pathways. Two unitary causes of ulcer were identified, with trauma and edema accounting for 6 and < 1% of ulcers, respectively. The majority of the lesions were on the plantar toes, forefoot, and midfoot. CONCLUSIONS: The most frequent component causes for lower-extremity ulcers were trauma, neuropathy, and deformity, which were present in a majority of patients. Clinicians are encouraged to use proven strategies to prevent and decrease the impact of modifiable conditions leading to foot ulcers in patients with diabetes.

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    January 1999, 22(1)
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    Causal pathways for incident lower-extremity ulcers in patients with diabetes from two settings.
    G E Reiber, L Vileikyte, E J Boyko, M del Aguila, D G Smith, L A Lavery, A J Boulton
    Diabetes Care Jan 1999, 22 (1) 157-162; DOI: 10.2337/diacare.22.1.157

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    Causal pathways for incident lower-extremity ulcers in patients with diabetes from two settings.
    G E Reiber, L Vileikyte, E J Boyko, M del Aguila, D G Smith, L A Lavery, A J Boulton
    Diabetes Care Jan 1999, 22 (1) 157-162; DOI: 10.2337/diacare.22.1.157
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