Final answer:
If the solution does not return after reconnecting the NG tube to drainage or suction, repeat the irrigation. Further actions such as increasing suction pressure or replacing the tube should only be done with medical guidance.
Step-by-step explanation:
If reconnecting the NG tube to drainage or suction does not result in the return of the solution, it is recommended to repeat the irrigation. Should the solution still not return, continue with the current procedure as advised by clinical protocols. Increasing the suction pressure, removing the NG tube for a new one, or administering medication should only be done under specific instructions from a healthcare professional. Typically, the decision on the next steps involves assessing the patient's condition, potential blockage, and other factors by healthcare staff.