slow flow
Delayed antegrade coronary blood flow without evidence of mechanical obstruction, typically graded using TIMI flow criteria.
Full Definition
A phenomenon characterized by delayed progression of contrast through coronary vessels despite absence of epicardial stenosis or occlusion. Slow flow is distinguished from no-reflow by the presence of antegrade flow, albeit delayed. The condition may result from microvascular dysfunction, distal embolization, or vasospasm. TIMI flow grades are used for objective assessment, with slow flow typically corresponding to TIMI 2 flow. Clinical significance includes potential for periprocedural myocardial injury and reduced procedural success. Treatment options include vasodilators, anticoagulation optimization, and mechanical therapies.
Usage
Usage note: Hyphenate when used as adjective; distinguish from no-reflow in clinical documentation.
In Context
- "Intracoronary adenosine was administered to address slow flow in the target vessel." — Procedural report
- "Slow flow phenomenon was observed following successful recanalization of the chronic total occlusion." — Case presentation