I don't know about being 10 years behind the times, but at least a couple of years. It was found that normal tubing only absorbs a small amount of the NTG before it will no longer absorb it, and this occurs over the first 2 hours as a rule.
If you do a search on nitroglycerin IV tubing using a good search engine, such as
www.google.com ,you should be able to get a a good amount of reading on the subject.
bob
But, don't worry, when I worked in Lawton a little over a year ago we were still using nitro tubing.