Pathophysiology
Clinical meaning
Episodic vasospasm of digital arteries and arterioles causes a classic triphasic color change: white (ischemia), blue (cyanosis), and red (reperfusion). In primary Raynaud's, the vasospasm is exaggerated and idiopathic; in secondary Raynaud's, it is associated with connective tissue diseases. Connect Raynaud's Phenomenon to bedside cues you will reassess first: vitals trends, work of breathing, perfusion, mentation, and pain or ischemic equivalents when relevant. Boards reward recognizing when subtle instability outweighs reassurance, then selecting nursing actions that protect airway, circulation, and neurologic status before routine tasks.