Recurrent Severe Vasospasm Episodes
Secondary Raynaud's drives repeated, severe digital artery spasm.
- Scleroderma: Common Cause (systemic sclerosis)
- Cold / Stress: Episode Trigger (placeholder)
- Digital Artery: Vessel Affected (placeholder)
- Secondary: Severity Class (vs primary Raynaud's)
Vasospasm mechanism
Cold or stress triggers exaggerated digital artery constriction.
Secondary Raynaud's carries higher ulcer risk than primary.
Underlying disease link
Scleroderma-associated vasculopathy amplifies spasm frequency and severity.
Early warning signs
Color change progresses white, blue, then red on rewarming.
Microvascular Occlusion Begins
Repeated ischemic episodes damage fingertip tissue over time.
- Capillary Bed: Vessel Level (placeholder)
- Endothelial Injury: Damage Type (placeholder)
- Progressive: Flow Reduction (placeholder)
- Diminishing: Reversibility (placeholder)
Repeated ischemia damage
Each spasm cycle chips away at fingertip microcirculation.
Chronic hypoxia sets the stage for tissue breakdown.
Occlusion onset
Small vessels begin to plug, blood flow drops further.
Subclinical injury
Damage often precedes any visible skin change.
Digital Ulcer Formation
Skin breakdown occurs at the fingertip pad under stress.
- Fingertip Pad: Ulcer Site (placeholder)
- Impaired: Healing Rate (poor blood supply)
- Often Severe: Pain Level (placeholder)
- Elevated: Infection Risk (placeholder)
Skin breakdown
Ischemic tissue ulcerates where perfusion is weakest.
Poor blood supply stalls normal wound healing.
Chronic wound behavior
Ulcers linger for weeks without adequate perfusion.
Clinical monitoring
Size and depth tracked to guide therapy decisions.
Risk Factors Worsen Ischemia
Smoking, disease severity, and undertreatment compound ischemic risk.
- Smoking: Risk Factor 1 (vasoconstrictive)
- Disease Severity: Risk Factor 2 (placeholder)
- Undertreated: Risk Factor 3 (inadequate therapy)
- Multiplicative: Combined Effect (placeholder)
Smoking impact
Nicotine sustains vasoconstriction, worsening tissue hypoxia.
Each added risk factor compounds ischemic burden.
Disease severity
Advanced scleroderma correlates with more frequent ulcers.
Undertreatment
Inadequate vasodilator dosing leaves ischemia unchecked.
Healing vs Critical Ischemia
Risk control and vasodilator therapy determine the outcome.
- Ulcer Heals: Good Path (placeholder)
- Critical Ischemia: Poor Path (placeholder)
- Gangrene Risk: Worst Case (placeholder)
- Weeks of Care: Key Lever (placeholder)
Favorable trajectory
Risk control plus therapy allows re-epithelialization over weeks.
Early, sustained management favors healing over necrosis.
Unfavorable trajectory
Persistent risk factors drive tissue toward necrosis.
Clinical takeaway
Vasodilator therapy and risk reduction are time-sensitive.