steal phenomenon
Retrograde blood flow pattern where blood is diverted from one vascular territory to supply another area of lower resistance.
Full Definition
Steal phenomenon describes a pathological blood flow pattern where blood is diverted or 'stolen' from one vascular territory to supply another area through retrograde flow, typically occurring when downstream resistance is significantly reduced. Common examples include subclavian steal (retrograde vertebral artery flow), coronary steal in dialysis access, and mesenteric steal syndromes. This phenomenon can be demonstrated on Doppler ultrasound or angiographic studies and may cause symptoms related to inadequate perfusion of the affected territory. Understanding steal physiology is crucial for planning interventions and predicting procedural outcomes.
Usage
Usage note: Specify the anatomical territory involved when describing steal phenomena.
In Context
- "Subclavian steal phenomenon was demonstrated with exercise-induced reversal of vertebral artery flow." — Cerebrovascular assessment
- "The steal phenomenon resulted in coronary insufficiency during dialysis sessions." — Cardiac evaluation in renal patient