Final answer:
After abdominal surgery, maintaining Intravenous therapy is essential for a patient connected to a nasogastric tube, ensuring hydration, electrolyte balance, and administration of necessary medications.
Step-by-step explanation:
When a patient undergoes abdominal surgery and is connected to a nasogastric tube (NG) for suction, the appropriate therapy to maintain is Intravenous therapy. This type of therapy is crucial as it ensures the patient receives adequate hydration and electrolytes, especially when the gastrointestinal tract is not functioning properly or needs to rest postoperatively. Intravenous therapy may also include the administration of medications, nutrients, and blood products, as required.