Final answer:
Hypokalemia can occur due to either an absolute or relative reduction of potassium in the body. In the case of NGT suctioning, the loss of potassium in gastric juice that is removed during the process can result in hypokalemia.
Step-by-step explanation:
Hypokalemia is an abnormally low potassium blood level that can occur due to either an absolute reduction of potassium in the body or a relative reduction of potassium in the blood. Absolute loss of potassium can result from decreased intake, vomiting, diarrhea, or alkalosis.
With regards to nasogastric tube (NGT) suctioning, hypokalemia can develop due to the loss of potassium in gastric juice that is removed during the suctioning process. Gastric juice contains potassium, and when it is removed by the NGT suctioning, it can lead to a decrease in the overall potassium levels in the body.