A nurse in a provider's office is caring for a client who has a gastric ulcer caused by Helicobacter pylori. The nurse should anticipate that in addition to cimetidine and sucralfate, the provider will prescribe which of the following?

A. Blood glucose 150 mg/dL:
This blood glucose level is slightly elevated but not significantly concerning on its own. It may be related to stress or other factors. In the context of acute gastroenteritis, it might be secondary to dehydration, but it is not an immediate priority unless the client is diabetic.

B. Potassium 2.5 mEq/L:
This is the correct answer. Low potassium levels (hypokalemia) are a severe concern, especially in the context of acute gastroenteritis where there can be significant losses through vomiting and diarrhea. Hypokalemia can lead to cardiac arrhythmias and needs urgent correction.

C. Weight loss of 3% of total body weight:
While weight loss is an important parameter, a 3% weight loss is usually not an immediate concern. In cases of acute gastroenteritis, rapid weight loss might indicate severe dehydration, but this choice is not as urgent as addressing a severe electrolyte imbalance like hypokalemia.

D. Urine specific gravity 1.035:
This specific gravity indicates concentrated urine, which could be due to dehydration. While this finding is important and indicates the need for rehydration, it is not as urgent as correcting a critically low potassium level.

A. Desmopressin:
Desmopressin is used to treat conditions like diabetes insipidus and bedwetting (enuresis) but is not related to the treatment of gastric ulcers caused by H. pylori.

B. Clarithromycin:
Correct Choice. Clarithromycin is an antibiotic often prescribed in combination with other medications to treat H. pylori infections. It helps eradicate the bacteria from the stomach, playing a crucial role in the treatment of gastric ulcers caused by H. pylori.

C. Mexiletine:
Mexiletine is an antiarrhythmic medication used to treat irregular heartbeats. It is not indicated in the treatment of gastric ulcers caused by H. pylori.

D. Filgrastim:
Filgrastim is a medication used to stimulate the production of white blood cells in the body. It is not used in the treatment of gastric ulcers caused by H. pylori.