I'm not sure exactly how many TPN mangas there are. You might need to check reliable manga databases or the official publisher's information for an accurate count.
Definitely not. TPN is a work of fiction. The author came up with the concepts and storylines independently, without drawing from any true incidents. It's all about creative storytelling and fantasy.
One TPN success story could be about a patient who was unable to eat due to a severe digestive disorder. Through TPN, they received all the necessary nutrients. Their body started to regain strength, and their overall health improved significantly. They were able to participate in light physical activities again and had more energy throughout the day.