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Diabetes, lower-extremity amputation, and death.

Ole Hoffstad1, Nandita Mitra1, Jonathan Walsh1

  • 1Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.

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This summary is machine-generated.

Lower-extremity amputation (LEA) in diabetic patients significantly increases mortality risk. Known diabetes complications only partially explain this increased risk, indicating other factors contribute to higher death rates after LEA.

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Area of Science:

  • Diabetology
  • Vascular Surgery
  • Epidemiology

Background:

  • Diabetes mellitus is associated with increased mortality.
  • Lower-extremity amputation (LEA) is a severe complication of diabetes.
  • The extent to which known diabetes complications explain excess mortality after LEA is unclear.

Purpose of the Study:

  • To determine if cardiovascular disease and renal failure fully explain the elevated death rate in diabetic patients who have undergone a lower-extremity amputation (LEA).

Main Methods:

  • Longitudinal cohort study utilizing The Health Improvement Network data.
  • Primary exposure: LEA; Outcome: all-cause death.
  • Cox proportional hazards models used to estimate the effect of LEA on death, adjusting for cardiovascular disease, Charlson index, and chronic kidney disease.

Main Results:

  • The hazard ratio (HR) for death after LEA was 3.02.
  • Fully adjusted HR for LEA diminished by only ~22% to 2.37, indicating significant unexplained risk.
  • Area under the receiver operating curve (AUC) for LEA alone was 0.51 (poorly predictive); fully adjusted model AUC was 0.77 (not strongly predictive).

Conclusions:

  • Diabetic individuals with LEA face a substantially higher mortality risk compared to those without LEA.
  • While known diabetes complications explain some excess mortality, a significant portion remains unexplained.
  • Unmeasured confounders are unlikely to fully account for the LEA-associated mortality risk.