Unit
- Neuropathy: Chronic hyperglycemia damages peripheral nerves, leading to loss of protective sensation. Patients cannot feel pressure or injury, so minor trauma goes unnoticed and progresses to ulceration.
- Peripheral arterial disease: Diabetes accelerates atherosclerosis, reducing blood flow to the lower extremities. Impaired perfusion delays healing and increases the risk of infection and tissue necrosis.
- Biomechanical abnormalities: Neuropathy causes muscle atrophy and foot deformities (e.g., claw toes, Charcot foot), altering gait and creating high-pressure areas that predispose to callus formation and breakdown.
- Impaired immune response: Hyperglycemia compromises neutrophil function and phagocytosis, making diabetic patients more susceptible to wound infections that are harder to eradicate.
- Chronic inflammation: Elevated glucose levels promote a persistent inflammatory state, with excessive matrix metalloproteinases that degrade growth factors and extracellular matrix, stalling the healing process.
- Reduced growth factor activity: Diabetes decreases the production and activity of key growth factors such as PDGF and VEGF, which are essential for angiogenesis and granulation tissue formation.
- Autonomic dysfunction: Damage to autonomic nerves reduces sweating, leading to dry, cracked skin that provides an entry point for bacteria. Autonomic neuropathy also alters blood flow regulation.
- Metabolic derangements: Poor glycemic control creates a catabolic environment that hinders protein synthesis and collagen deposition, both critical for wound closure.
- Psychosocial barriers: Diabetes related distress, depression, and lack of social support are prevalent among patients and strongly correlate with poor glycemic control, inadequate foot inspection, and noncompliance with offloading regimens. These psychosocial barriers directly increase the risk of ulceration and hinder effective wound management.
- Impaired nutritional status: Diabetic patients often have micronutrient deficiencies, including vitamin A, vitamin C, zinc, and protein. These nutrients are essential for collagen synthesis, epithelialization, and immune function. Inadequate intake or metabolic wasting directly starves the wound healing machinery and prolongs recovery.
- Lower extremity edema: Peripheral edema is common in diabetes due to autonomic dysfunction, nephropathy, or heart failure. Excess interstitial fluid increases capillary diffusion distance for oxygen, impairs nutrient delivery, and creates a moist environment that promotes bacterial overgrowth and maceration of periwound skin.
- Bacterial biofilm persistence: Diabetic wound beds are highly susceptible to polymicrobial biofilms, which are structured communities of bacteria encased in a protective matrix. Biofilms resist systemic antibiotics and host immune defenses, driving chronic inflammation and preventing granulation tissue formation or epithelial migration.
Scope of Practice
Role: Wound Care Nurse in Outpatient Setting
Within scope:
- Conducting initial wound assessment and documenting findings
- Applying evidence-based dressings and topical therapies per protocol
- Educating patients on offloading footwear and glucose control
- Communicating changes in wound status to the attending provider
Outside scope:
- Diagnosing the underlying cause of ulceration (e.g., arterial vs. neuropathic)
- Prescribing systemic antibiotics or advanced biologics
- Performing surgical debridement or revascularization procedures
- Adjusting diabetes medications or insulin regimens
Quick Revision
- Diabetic foot ulcers result from neuropathy, ischemia, and biomechanical changes.
- Impaired immune function and chronic inflammation delay healing.
- Wound care nurses assess, dress, and educate but do not diagnose or prescribe.
- Understanding pathophysiology guides prevention and treatment strategies.