This is a question for Dr. Sclafani and all of the IRs who visit this website.
In this 2009 paper Zamboni reported patency rates of 53% for the IJV and 96% for the azygous.:
“The risk of restenosis was higher in the IJVs compared with the AZY (patency rate: IJV, 53%; AZY, 96%; odds ratio, 16; 95% confidence interval, 3.5-72.5; P < .0001).”http://www.ncbi.nlm.nih.gov/pubmed/19958985
In your opinion has the patency rate improved since then? If so what factors contributed to the improvement?