Document Detail

Intragastric nitroglycerin at a vasodilatory dose attenuates acidified aspirin-induced gastric mucosal injury.
MedLine Citation:
PMID:  17420937     Owner:  NLM     Status:  MEDLINE    
Clinical studies reveal that aspirin intake to prevent myocardial and cerebral ischemia is associated with a significant increase in upper gastrointestinal hemorrhage requiring hospitalization and that nitroglycerin or long-acting nitrates significantly lower this risk. Nitroglycerin can increase gastric blood flow and slow gastric emptying. We hypothesized that both features contribute to its gastroprotective property. Fasted anesthetized rats (Study 1) and conscious mice (Studies 2 to 4) received intragastric nitroglycerin or vehicle. The effects of these two treatments on various parameters were assessed in Study 1, on blood pressure and gastric blood flow; Study 2, on acidified aspirin-induced gastric mucosal lesions; and Study 3, on the weight of gastric content. In Study 4, the effect of nitroglycerin, vehicle, or vehicle plus saline, on acidified aspirin-induced gastric mucosal lesion was assessed. Compared with vehicle, nitroglycerin decreased blood pressure and produced a mild but significant increase in gastric vascular conductance, blood flow, and volume of gastric content. The number and length of gastric mucosal lesions induced by acidified aspirin were significantly attenuated by intragastric nitroglycerin in a vasodilatory dose. Exogenous saline in a volume equivalent to the increase produced by nitroglycerin, however, did not attenuate the lesions. These experimental data are consistent with the clinical observation that nitrates lower the risk of aspirin-induced gastrointestinal complications. Confirmation of the efficacy of nitroglycerin and nitrates in preventing such aspirin-induced complications in controlled trials is worthy of consideration by clinical investigators.
Felix W Leung; Chi Chung Chan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-04-10
Journal Detail:
Title:  Digestive diseases and sciences     Volume:  52     ISSN:  0163-2116     ISO Abbreviation:  Dig. Dis. Sci.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-09     Completed Date:  2007-09-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7902782     Medline TA:  Dig Dis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2229-35     Citation Subset:  AIM; IM    
Research and Medical Services, Sepulveda Ambulatory Care Center, VA Greater Los Angeles Healthcare System, David Geffen School of Medicine at UCLA, Los Angeles, California 91343, USA.
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MeSH Terms
Anti-Inflammatory Agents, Non-Steroidal / toxicity
Aspirin / toxicity
Blood Flow Velocity / drug effects
Disease Models, Animal
Gastric Mucosa / blood supply*,  drug effects
Gastritis / chemically induced,  drug therapy*,  physiopathology
Laser-Doppler Flowmetry
Nitroglycerin / administration & dosage*
Rats, Sprague-Dawley
Treatment Outcome
Vasoconstriction / drug effects*
Vasodilator Agents / administration & dosage*
Reg. No./Substance:
0/Anti-Inflammatory Agents, Non-Steroidal; 0/Vasodilator Agents; 50-78-2/Aspirin; 55-63-0/Nitroglycerin

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