Vascular stenosis is a pathological hallmark of atherosclerosis, but its transient process is not well understood due to the lack of analytical tools to study it. Here we report spatiotemporally resolved observation of shear-induced platelet aggregation by combining a microfluidic on-chip stenosis model and optofluidic time-stretch microscopy. Our results indicate a synergistic effect of stenosis and agonists on platelet activation and aggregation. Particularly, an agonist, thrombin receptor activator peptide 6, causes preferential enhancement of platelet aggregation. Our findings are expected to deepen our understanding of stenosis-induced platelet aggregation and pave ways for developing effective antithrombotic therapeutics.
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