Microvascular Disease Increases Amputation in Patients With Peripheral Artery Disease

Area of Science:

• Vascular Medicine
• Diabetology
• Nephrology

Background:

• Over 2 million Americans live with amputation, with peripheral artery disease (PAD) and diabetes mellitus as primary causes.
• The ankle-brachial index (ABI) is standard for PAD diagnosis but inadequately predicts limb outcomes.
• Microvascular disease (MVD) is increasingly recognized as a systemic condition affecting multiple organ systems.

Purpose of the Study:

• To investigate the independent and combined impact of PAD and MVD on lower limb outcomes.
• To highlight the synergistic effect of PAD and MVD on amputation risk.
• To advocate for aggressive surveillance and diagnosis of both PAD and MVD.

Main Methods:

• Literature review on PAD, diabetes mellitus, and microvascular disease (MVD).
• Analysis of studies examining limb outcomes in patients with PAD and/or MVD.
• Evaluation of the diagnostic limitations of the ankle-brachial index (ABI).

Main Results:

• MVD independently predicts poor lower limb outcomes, irrespective of PAD or diabetes status.
• PAD and MVD exhibit a synergistic effect, significantly elevating amputation risk.
• Combined PAD and MVD presence indicates a substantially higher risk of limb loss.

Conclusions:

• MVD is a critical, independent predictor of adverse limb outcomes.
• Aggressive foot surveillance and diagnosis of both PAD and MVD are essential.
• Early intervention for PAD and MVD can help prevent amputations and maintain patient ambulation.