An Older Patient with a Bleeding Duodenal Ulcer Has a Nasogastric

An older patient with a bleeding duodenal ulcer has a nasogastric (NG) tube in place. The health care provider prescribes 30 mL of aluminum hydroxide/magnesium hydroxide (Maalox) to be instilled through the tube every hour. To evaluate the effectiveness of this treatment,the nurse

A) monitors arterial blood gas values daily.
B) periodically aspirates and tests gastric pH.
C) checks each stool for the presence of occult blood.
D) measures the volume of residual stomach contents.

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