[Case Study] Identifying Underlying Vascular Disease In A Patient Seeking Foot Ulcer Care

[Case Study] Identifying Underlying Vascular Disease In A Patient Seeking Foot Ulcer Care

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Case Study Diabetic Foot Ulcer on Coumadin by Omni-stat Medical Inc

Title: Case Study Diabetic Foot Ulcer on Coumadin
Channel: Omni-stat Medical Inc
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[Case Study] Identifying Underlying Vascular Disease In A Patient Seeking Foot Ulcer Care

For wound care clinicians, a non-healing foot ulcer is rarely just a localized skin issue. More often, it is the visible manifestation of a deeper systemic problem. Among the most critical—and frequently overlooked—underlying factors is vascular disease, specifically Peripheral Artery Disease (PAD).

Without adequate blood flow, even the most advanced wound therapies will fail. This case study details how a systematic clinical evaluation identified severe underlying vascular disease in a patient seeking routine foot ulcer care, preventing limb loss through timely intervention.

Patient Presentation: The Red Flags of Non-Healing Wounds

Patient Profile

Age/Gender: 67-year-old male (Robert)
Chief Complaint: A non-healing ulcer on the plantar aspect of the left great toe, present for six weeks.
Relevant Medical History: Type 2 Diabetes Mellitus (uncontrolled, HbA1c: 8.4%), Hypertension, Hyperlipidemia, and a 30 pack-year smoking history.
Prior Treatment: Local wound care with over-the-counter ointments and adhesive bandages.

Initial Clinical Presentation

Upon presentation, Robert reported mild, dull aching in his left foot, which he attributed to "getting older." He noted that the pain occasionally worsened at night when lying in bed, but improved when he dangled his foot over the side of the mattress (a classic sign of ischemic rest pain).

[Visual Inspection of Left Foot]
  │
  ├── Wound Site: Plantar aspect of left hallux (1.5 cm x 1.2 cm)
  ├── Wound Bed: Pale, fibrotic, lacking healthy granulation tissue
  ├── Margins: Well-demarcated, "punched-out" appearance
  └── Periwound Skin: Shiny, hairless, cool to the touch

During physical examination, bilateral pedal pulses (dorsalis pedis and posterior tibial) were assessed:

Right Foot: 2+ (Normal, palpable)
Left Foot: 0 (Absent to palpation)

Step-by-Step Vascular Assessment in Wound Care

When a patient presents with a lower extremity wound and diminished pulses, a comprehensive vascular assessment is mandatory before initiating any aggressive debridement or compression therapy.

1. Bedside Diagnostic Tests

To objectively measure perfusion, the clinical team performed two primary bedside assessments:

Ankle-Brachial Index (ABI): Robert's ABI on the left leg was measured at 1.35. While a high ABI (>1.30) might superficially suggest healthy arteries, in diabetic patients, it typically indicates falsely elevated pressures caused by severe arterial calcification (medial arterial sclerosis).
Toe-Brachial Index (TBI): Because digital arteries are rarely calcified, a TBI is highly reliable in diabetic patients. Robert’s left TBI was 0.32 (normal is >0.70), confirming severe limb ischemia.
Handheld Doppler Signal Analysis: Auscultation of the left dorsalis pedis artery revealed a weak, monophasic sound, contrasting with the healthy triphasic sound of the right foot.

2. Advanced Diagnostic Referrals

Given the clinical presentation and a TBI of 0.32, Robert was fast-tracked for advanced imaging:

Arterial Duplex Ultrasound: Revealed hemodynamically significant stenosis (>80%) in the left superficial femoral artery (SFA) and severe diffuse disease in the infrapopliteal (below-the-knee) vessels.
CT Angiography (CTA): Confirmed multi-segmental arterial occlusion, mapping the precise anatomy for potential revascularization.

Case Study Analysis: Diagnosis and Treatment Plan

Identifying Peripheral Artery Disease (PAD)

Robert’s diagnosis was finalized: Ischemic Diabetic Foot Ulcer secondary to severe Peripheral Artery Disease (PAD).

In this case, the wound was classified as a neuro-ischemic ulcer. While diabetic neuropathy contributed to his lack of early awareness of the wound, it was the severe arterial insufficiency (PAD) that prevented the wound from healing.

Ischemia (Lack of O2 & Nutrients) ──> Impaired Cellular Proliferation ──> Necrosis & Non-healing Ulcer

Multi-Disciplinary Intervention

Healing an ischemic ulcer requires a two-pronged approach: restoring blood flow and providing optimal local wound care.

Phase 1: Revascularization (Vascular Surgery)

Robert was referred to a vascular surgeon who performed a successful minimally invasive endovascular angioplasty and stenting of the left superficial femoral artery. This procedure successfully restored straight-line flow to the foot. Post-procedure, pedal pulses were palpable (1+), and his TBI improved to 0.65.

Phase 2: Advanced Wound Management

With perfusion restored, the wound care team implemented a targeted healing protocol:

Conservative Debridement: Removal of non-viable, fibrotic tissue to stimulate healthy granulation.
Moisture Balance: Application of a collagen-matrix dressing to promote cellular migration, covered with a protective silicone foam border.
Offloading: Prescription of a customized removable boot to eliminate mechanical pressure on the plantar aspect of the great toe during ambulation.
Systemic Optimization: Coordination with his primary care physician to optimize glycemic control (targeting HbA1c < 7.0%) and initiate high-intensity statin and antiplatelet therapy.

Key Takeaways for Wound Care Specialists

Identifying vascular disease early can mean the difference between limb preservation and amputation. Use the table below to quickly differentiate the clinical features of lower extremity ulcers.

Differential Diagnosis of Lower Extremity Ulcers

Clinical Action Checklist

[ ] Always palpate pedal pulses on every patient presenting with a lower extremity wound.
[ ] Do not rely solely on ABI in diabetic patients. Always obtain a Toe-Brachial Index (TBI) if arterial calcification is suspected.
[ ] Avoid compression therapy in patients with an ABI < 0.5 or TBI < 0.4, as this can worsen ischemia and cause tissue necrosis.
[ ] Establish a low threshold for vascular referral when a wound shows no signs of healing within 2 to 4 weeks of standard care.

Conclusion: Prioritizing Vascular Health to Ensure Wound Healing

Robert’s foot ulcer successfully healed within 10 weeks following his revascularization procedure. This case highlights a fundamental truth in wound care: wound healing is a vascular event.

Clinicians must look beyond the margins of the wound bed and assess the patient’s macrovascular status. By integrating systematic vascular assessments—such as TBIs and handheld Doppler evaluations—into routine foot ulcer care, healthcare providers can identify underlying vascular disease early, optimize treatment pathways, and significantly reduce the risk of lower-limb amputation.

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