Table 1.

Scoring chart

	Time (min)	Leakage	Shape	Flow (ml/min)	Self-estimation
5 Points	< 8	None	Cobra head	> 200	Easy
4 Points	8–12	Oozing		151–200	Relatively easy
3 Points	12–16	1 Point leakage	Stenosis	101–150	Moderate
2 Points	16–20	2 Points leakage		51–100	Relatively difficult
1 Point	20 <	Dehiscence	Occlusion	< 50	Difficult
− 1 Point	Issues with the shunt tube
− 2 Points	Issues with the needle or thread