Table 1. Relationship between Classification of Hepatic Arteriovenous Shunts and Polyvinyl Alcohol Particle Size.

Timing of Venous Opacification	HAVS Type	PVA Particle
>3 seconds	Slow flow	250–350 μm
1.5–3 seconds	Intermediate flow	350–510 μm
0.5–1.5 seconds	High flow	750–1000 μm

PVA, polyvinyl alcohol; HAVS, hepatic arteriovenous shunt.