Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Chronic PAD means stop smoking now, walk 30–45 minutes three times a week with a trainer, take a daily antiplatelet pill (aspirin or clopidogrel) and a statin, and fix severe blockages with a balloon-and-stent or bypass if rest pain or dead tissue shows up. ALI is a sudden clot that plugs the artery in minutes; fix blood flow within 6 hours or the leg dies.
The Garden Hose With Rust Inside
Imagine a garden hose that waters your yard. Rust (plaque) slowly builds up on the inside wall, making the pipe narrower — like cholesterol and scar tissue clogging a real artery. When you turn the faucet to a trickle (resting blood flow), water still gets through, but the hose stays cold because less water moves. When you crank it to full blast (exercise demand), the narrow section cannot deliver enough water and pressure drops downstream — your leg muscles scream for oxygen like a plant wilting in heat (claudication). Now imagine a sudden kink or a cork jamming the hose completely (acute clot): water stops dead in seconds, the hose downstream drains white, and without flow, the plants downstream die in hours (tissue tissue death (necrosis)). The rust took years to build; the cork arrived in minutes. Both break the same pipe, but the timeline and the body's emergency backup plans (collateral hoses your neighbor ran over time) make all the difference.
AHA/ACC 2016 Guideline on the Management of Patients with Lower Extremity Peripheral Artery Disease · European Society for Vascular Surgery (ESVS) 2020 Clinical Practice Guidelines on the Management of Acute Limb Ischaemia · Society for Vascular Surgery (SVS) Lower Extremity Threatened Limb Classification System · UpToDate clinical reviews on peripheral arterial disease and acute limb ischemia · reviewed 2026-07-07