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Aspirin damage to ischemic gastric mucosa in shocked cats
Insights
Hemorrhagic shock exacerbates aspirin-induced gastric mucosal damage. This occurs due to reduced blood flow (ischemia) in the stomach lining, increasing erosion risk when aspirin is present.
Area of Science:
- Gastroenterology
- Physiology
- Pharmacology
Background:
- Aspirin is a common medication known to cause gastrointestinal side effects.
- Hemorrhagic shock significantly impacts organ perfusion, including the gastric mucosa.
Purpose of the Study:
- To investigate the effect of hemorrhagic shock on aspirin-induced gastric mucosal damage.
- To determine the role of gastric mucosal blood flow in aspirin-related lesions.
Main Methods:
- Cardiac output and regional gastric blood flow were measured using the microsphere distribution technique in anesthetized cats.
- Aspirin tablets were administered directly into the stomach via gastrotomy.
- Hemorrhagic shock was induced by bleeding to reduce arterial pressure, followed by reinfusion.
Main Results:
- Gastric mucosal blood flow significantly decreased during induced hemorrhagic shock.
- Gastric mucosal erosions were observed at aspirin contact sites 3 hours after reinfusion in bled animals.
- Non-bled animals treated with aspirin showed no significant mucosal lesions after 4.5 hours.
- Hemorrhagic shock alone, without aspirin, did not cause mucosal damage.
Conclusions:
- Aspirin-induced gastric damage is significantly worsened by hemorrhagic shock.
- Mucosal ischemia resulting from hemorrhagic shock is a key factor in the increased susceptibility to aspirin-induced gastric injury.
Abstract:
Cardiac output and blood flow to different regions and layers of the stomach were determined by the microsphere distribution technique. Aspirin tablets were placed in the stomach of anesthetized cats by gastrotomy. In some animals the arterial pressure was reduced to about 60 mmHg for 30 min by bleeding. The gastric mucosal blood flow decreased markedly during the bleeding. Three hours after reinfusion of the blood gastric mucosal erosions were present at the site of contact of the tablet with the mucosa. In most of the non-bled animals no mucosal lesions were found 4 1/2 after aspirin application. No mucosal damage occurred in animals subjected to bleeding without aspirin treatment. It is concluded that the aspirin damage to the gastric mucosa increases under hemorrhagic shock because of mucosal ischemia in the shocked animals.