Raynaud's phenomenon
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Primary Raynaud vs. Secondary Raynaud — Differential Diagnostic Criteria
| Features | Primary Raynaud's | Secondary Raynaud's |
|---|---|---|
| Age of onset | Typically before 30, and often in adolescence | After 30-35 years, late onset is a red flag |
| Gender | Strong female predominance (F:M = 9:1) | Depends on the associated disease + scleroderma: F:M = 9:1 + PAH: F++ |
| Severity | Moderate episodes, well-defined, bilateral, symmetrical, disappearing completely between episodes | Often severe + prolonged + possible asymmetrical episodes + digital ulcers + possible necrosis |
| Digital ulcers and necrosis | Absent (no ischemic lesion) + if present → reclassify as secondary | Present in severe forms (scleroderma ++) + risk of amputation → vascular emergency |
| Autoantibodies (ANA + Anti-centromere + Anti-Scl-70) | Negative (or weakly positive without specificity) | Positive by connectivity: AAN (lupus + scleroderma) + anticentromere (limited scleroderma CREST) + anti-Scl-70 (diffuse scleroderma) + anti-SSA/SSB (Sjögren's) |
| Periungual capillaroscopy | Normal (regular capillaries + homogeneous distribution) | Anomalies in connectivities: megacapillaries + avascular areas + disorganization + periungual hemorrhages (scleroderma pattern) |
| Other associated clinical signs | Absent — Isolated Raynaud's | Sclerodactyly + puffy fingers + telangiectasias + pulmonary arterial hypertension (dyspnea) + dysphagia + dry mouth + dry eyes + arthritis + myalgia + photosensitivity |
| Prognosis | Bénin + pas d'évolution vers une maladie systémique dans 90–95 % des cas + possible amélioration à la ménopause ou avec l'âge | Depends on the associated disease + risk of digital vascular complications + internal organs (lungs + kidneys + heart in scleroderma) |
Etiologies of secondary Raynaud's
- Connectivity (main causes): sclérodermie systémique (Raynaud dans 95 % des cas — souvent inaugural) + lupus érythémateux systémique + syndrome de Sjögren + polymyosite + dermatomyosite + polyarthrite rhumatoïde + connectivite mixte (MCTD) + syndrome des antiphospholipides
- Vascular diseases: Obstructive arteriopathy of the upper limbs + thromboangiitis obliterans (Buerger's disease - smoking) + atherosclerosis + cholesterol emboli + Takayasu arteritis
- Drug-induced causes: beta-blockers (peripheral vasoconstriction) + ergotamine + bromocriptine + methysergide + chemotherapy (bleomycin + cisplatin + vinblastine) + cyclosporine + sympathomimetic agents + prolonged use nasal decongestants
- Occupational and mechanical causes: Vibration white finger (workers using vibrating tools - chainsaws + drills + jackhammers) + carpal tunnel syndrome + thoracic outlet syndrome + repetitive hand trauma
- Hematologic causes: Cryoglobulinemia + Cold agglutinins + Polycythemia vera + Essential thrombocythemia
- Endocrine causes: hypothyroidism (systematically search for reversible cause)
Diagnostic assessment
- First-line assessment (all patients): NFS + VS + CRP + creatinine + blood glucose + TSH (hypothyroidism) + ANA (antinuclear antibodies) by indirect immunofluorescence → if ANA positive (> 1/160) → complete with anti-native DNA + anti-Sm + anti-SSA + anti-SSB + anti-centromere + anti-Scl-70 + anti-PM-Scl + anti-tRNA synthetase + cryoglobulins if suspected
- Periungual capillaroscopy: Non-invasive, painless examination performed with a slit lamp or videocapillaroscope that visualizes capillaries around the nail bed. Normal in primary Raynaud's. Pathognomonic anomalies in scleroderma patterns include megacapillaries (dilated, mega-loop capillaries), avascular areas (capillary-free patches), disorganization, and intralobar hemorrhages. Should be performed in all patients with Raynaud's to distinguish between primary and secondary causes.
- Upper extremity Doppler ultrasound If suspicion of occlusive vascular disease + pulse asymmetry + upper limb claudication + thoracic outlet syndrome
- Cold water immersion test: reproduced experimentally + rarely used in routine (discomforts)
Treatment
- General measures (all patients): Protection against the cold (gloves + warm clothing + full-body protection, not just hands - digital vasoconstriction can be triggered by whole-body cooling) + mandatory smoking cessation (nicotine = a powerful vasoconstrictor) + stopping vasoconstrictive medications if possible (beta-blockers + decongestants) + relaxation and stress management techniques + active warming at the start of an episode (hot bath + circular arm movements)
- Calcium channel blockers (first-line pharmacological treatment): nifedipine extended-release 30–60 mg/day (Adalat® XL) → peripheral arteriolar vasodilator → reduction of frequency and duration of episodes by 30–50 % + amlodipine 5–10 mg/day → better tolerated alternative (fewer side effects) + adverse effects: headaches, flushing, ankle edema, hypotension + seasonal use (autumn-spring) acceptable in mild forms
- PDE5 inhibitors (severe or secondary Raynaud's): sildenafil (Revatio® + Viagra® 25–100 mg/day) + tadalafil (Cialis® 10–20 mg) → vasodilation via NO → effective in severe secondary Raynaud's, especially scleroderma + reduction of digital ulcers + reimbursed in certain severe cases
- Prostanoids IV (digital ulcers + critical ischemia of the extremities): iloprost IV (Ventavis® — prostacyclin analogue) → vasodilation + platelet aggregation inhibition → hospitalization + IV infusions over 3 to 5 days → indicated for severe digital ulcers or critical digital ischemia of scleroderma
- Bosentan (Tracleer® — endothelin antagonist): approved specifically to reduce the number of new digital ulcers in scleroderma + not indicated in primary Raynaud's + hepatotoxic → monthly monitoring of transaminases
- Digital sympathectomy reserved for refractory cases with digital ischemia threatening amputation + chemical sympathectomy (peri-vascular botulinum toxin injection) or surgical (digital peri-arterial sympathectomy) → transient to permanent improvement
Consult a rheumatologist or internist if a Raynaud's phenomenon appears after age 35, if digital ulcers or necrosis of the fingers develop, if signs of connective tissue disease are present (puffy fingers, telangiectasias, dysphagia, dry eyes or mouth, photosensitivity) or if ANA are positive. An active digital ulcer in the context of secondary Raynaud's is a vascular emergency requiring intensive vasodilator treatment (IV iloprost) to prevent amputation. For the initial evaluation of Raynaud's, capillaroscopy, and autoantibodies, Clinique Omicron offers consultations at its service points in Quebec and via telemedicine. To make an appointment, visit cliniqueomicron.ca.
Consult at Clinique Omicron
Clinique Omicron's Nurse Practitioners (NPs) and Physician Assistants (PAs) assess Raynaud's phenomenon, differentiating primary from secondary forms. They prescribe initial assessments (ANA + TSH + CBC + ESR), refer for capillaroscopy, initiate calcium channel blockers (nifedipine + amlodipine) for bothersome symptomatic forms, provide advice on cold protection and smoking cessation, and refer to rheumatology for forms secondary to connective tissue disease or refractory cases with digital ulcers. Consultations are available at multiple service locations in Quebec and via telemedicine. To book an appointment, visit cliniqueomicron.ca.
The content of this page is for informational purposes only and does not replace the advice of a doctor or rheumatologist. Late-onset (after 35 years of age) + asymmetrical + severe Raynaud's phenomenon + with digital ulcers should be investigated as a priority to rule out systemic scleroderma or another underlying connective tissue disease. Periungual capillaroscopy is the key examination for differentiating primary and secondary Raynaud's.
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