Scenario:
A 24-year-old woman presents with persistent vomiting. Before prescribing metoclopramide, the physician reviews her history and decides against it because she has suspected bowel obstruction.
Why should metoclopramide be avoided in this patient?
It may mask signs of infection.
It increases gastrointestinal motility, which can worsen bowel obstruction or perforation.
It causes severe constipation.
It decreases intestinal blood flow.
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Question :
Why is increasing gastrointestinal motility beneficial in some patients but potentially harmful in patients with bowel obstruction? Explain your reasoning.
Increased gastrointestinal motility is helpful when the digestive tract is functionally slowed but not necessarily physically blocked (gastroparesis or delayed gastric emptying). Under such conditions, medications like metoclopramide trigger coordinated contraction movements that push food through the stomach and intestines, alleviating symptoms like nausea, vomiting, and bloating.
In bowel obstruction, in contrast, there is a mechanical obstruction to the normal passage of the intestinal contents. Gastrointestinal contractions against this obstruction raise pressure within the bowel without relief of the obstruction. The pain and distension can increase and lead to bowel ischemia or perforation which can be life-threatening. Prokinetic drugs are therefore avoided until bowel obstruction is excluded.
In bowel obstruction prescribing drugs like metaclopramide can increase chances of bowel ischemia and perforation. Hence it should be avoided in bowel obstruction.
Increasing gastrointestinal (GI) motility is beneficial for gastroparesis or chronic constipation because it moves chyme and waste by digestive tract. However, in mechanical bowel obstruction, forcing motility can dramatically increase intraluminal pressure, leading to ischemia, bowel perforation, and sepsis.