DermatologyTier 2Disease (DEADMAN)

Cutaneous manifestations of adverse effects of therapeutic interventions - cholesterol emboli

Description

Cholesterol embolism produces characteristic cutaneous findings - livedo reticularis and "blue toe syndrome" - from showers of cholesterol crystals from ulcerated atherosclerotic plaque lodging in small dermal vessels, typically following a vascular intervention or anticoagulation/thrombolysis

Epidemiology

Occurs in patients with extensive aortic/large vessel atherosclerosis, typically following angiography, vascular surgery, or anticoagulant/thrombolytic therapy that can dislodge plaque material

Aetiopathogenesis

Cholesterol crystals embolise to small dermal arterioles, provoking a local inflammatory/foreign body reaction and downstream tissue ischaemia - see cholesterol embolus for the full systemic mechanism, since skin findings are often part of a broader multi-organ embolic shower

Diagnosis

Livedo reticularis (a mottled, net-like purplish skin discoloration) and "blue toe syndrome" (cyanotic, painful toes with palpable peripheral pulses, distinguishing it from acute limb ischaemia from a large embolus/thrombus) are the classic cutaneous signs
Occurs in the correct temporal context following a vascular procedure, often alongside eosinophilia and evidence of other organ involvement (renal impairment particularly)

Management

Supportive management - no specific reversal treatment for the embolic shower itself; manage cutaneous ischaemia symptomatically and address any systemic organ involvement
Reconsider ongoing anticoagulation given its potential role in perpetuating further showering, balanced against the original indication for anticoagulation

Associations

Recent vascular procedure/angiography, extensive aortic atherosclerosis, eosinophilia, renal impairment (concurrent systemic embolisation)

Natural history & complications

The combination of palpable pulses with cyanotic toes (rather than pulseless, cold ischaemic toes) is the key clinical distinguishing feature of cholesterol embolism from acute large-vessel limb ischaemia, directing the correct diagnostic pathway (embolic shower workup) rather than urgent vascular intervention for macrovascular occlusion

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