steal phenomenon
Diversion of blood flow from one vascular territory to another due to differential resistance.
Full Definition
Steal phenomenon describes a pathological condition where blood flow is diverted away from one vascular territory to supply another area with lower resistance, potentially causing ischemia in the donor territory. This occurs when there is a significant pressure gradient between vascular beds, commonly seen in subclavian steal syndrome, coronary steal, or cerebral steal syndromes. The phenomenon can be demonstrated on imaging through reversed flow patterns, differential enhancement timing, or provocative testing with vasodilators. Understanding steal physiology is crucial for interpreting hemodynamic studies and planning therapeutic interventions to restore normal flow distribution.
Usage
Usage note: Specify the anatomical location and hemodynamic consequences when present.
In Context
- "Subclavian steal phenomenon was confirmed by demonstrating reversed flow in the left vertebral artery." — Carotid ultrasound report
- "Exercise testing revealed coronary steal with decreased perfusion to the native circulation." — Cardiac catheterization report