Hyponatremia and NG tubes to suction

Why would a patient have hyponatremia when an NG tube is in place and connected to suction? I am working on practice questions to study for HESI and it was one of the questions but the rationale provided doesn't state why the patient would be hyponatremic.
What are your ideas? Think about fluid and electrolytes.

I know that water follows sodium so I was thinking that since the NG tube is pulling fluid out of the stomach to decompress it then the sodium is following it and that would lead to hyponatremia.

What about the sodium blank blank?

Remember that there is always electrolytes imbalance in suctioning coz ur removing all gastric content

Thank you. I appreciate it.

Sodium is in the gastric contents so removing it by NG tube via suction would cause the sodium levels to decrease.

and yet our NG tube pts have more of a focus on K+ They are usually on D5 1/NS with either 20/40 K

Gastric contents actually contain very little k. It is the hypovolemia from suction that causes hypokalemia.

Thank you.

Thank you, appreciate it.