I have worked with many patients with a nissen... and yes they still have problems... Sometimes very bad... Lots of mucous, (etc). gagging, wretching. Usally requires a lot of venting. These patients will usally receive night nursing so that they have an awake care provider. If they become ill, it can become worse (more secretions, etc.) It isn't fool proof either. The nissen can become loose. Good luck..... Take care..