Raynaud phenomenon

Full Definition

Raynaud phenomenon is a vascular disorder characterized by episodic vasospasm of small arteries and arterioles in the digits, typically triggered by cold exposure or emotional stress. The condition manifests as a characteristic triphasic color change: white (pallor from vasoconstriction), blue (cyanosis from deoxygenation), and red (hyperemia during reperfusion). It can be primary (idiopathic) or secondary to underlying connective tissue diseases, making differentiation crucial for prognosis and management.

Usage

Usage note: Use 'phenomenon' rather than 'disease' unless specifically referring to primary form.

In Context

• "The patient exhibited classic Raynaud phenomenon with triphasic color changes following cold exposure." — Clinical examination note
• "Secondary Raynaud phenomenon may indicate underlying scleroderma or other connective tissue disorders." — Differential diagnosis discussion