Final answer:
The question refers to parenteral nutrition, which requires central access and is often used when enteral nutrition is not possible for more than 7 days.
Step-by-step explanation:
The blanks in the question seem to refer to parenteral nutrition as the subject at hand. Parenteral nutrition is a method of providing nutrition to the body by an intravenous route, bypassing the gastrointestinal tract, and it is typically indicated when enteral feeding (nutrition via the gut) is contraindicated or not possible for extended periods of time, typically for more than 7 days.
There are several types of parenteral nutrition, including total parenteral nutrition (TPN) and peripheral parenteral nutrition (PPN), with TPN being the more common for long-term or complete nutrition. This is a complex therapy that requires careful consideration of a patient's nutritional needs, as well as monitoring for potential complications, and it's often administered under the guidance of a healthcare team specialized in nutrition.
In conclusion, parenteral nutrition requires central access and is indicated when there is a need for non-enteral feeding that persists for more than 7 days.