The effect of flufenamic acid on gastrointestinal myoelectrical activity and transit time in dogs.
BACKGROUND
Flufenamic acid, a fenamate, has been shown to alter markedly the membrane potential of small intestinal smooth muscle and increase intracellular calcium in single cells.


OBJECTIVE
To determine the effects of flufenamic acid on myoelectrical motor activity and gastrointestinal transit in the intact animal.


METHODS
Myoelectrical motor activity was recorded via seromuscular platinum electrodes sutured at regular intervals in the stomach and throughout the small intestine. Fasted and fed gastrointestinal transit was assessed using technetium-99m (99mTc) as the radioactive marker linked to 1 mm amberlite pellets or added to the meal.


RESULTS
Flufenamic acid (600 mg, intravenously) induced intense spike activity in the small intestine. The mean duration of irregular spike activity was 250 (7) minutes. Spike activity was more pronounced in the lower small intestine. Flufenamic acid also accelerated initial gastric emptying and markedly shortened transit time in the small intestine. In the fasted state the 50% transit time in the small intestine was 54 (8) minutes with infusion of flufenamic acid compared with 105 (10) minutes in the control group; in the fed state 99mTc first reached the colon at 220 (10) minutes compared with 270 (12) minutes in the control group.


CONCLUSIONS
Flufenamic acid had marked effects on both myoelectrical motor complex activity and small intestinal transit in the dog. The observed effects suggest that flufenamic acid may be of potential use as a prokinetic agent.
Farrugia
G
G
Division of Gastroenterology and Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
Nitecki
S
S
Harty
G J
GJ
Camilleri
M
M
Szurszewski
J H
JH
D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D004064:Digestive System / Q000187:drug effects; D004068:Digestive System Physiological Phenomena; D004285:Dogs; D005215:Fasting; D005260:Female; D005439:Flufenamic Acid / Q000494:pharmacology*; D005772:Gastrointestinal Transit / Q000187:drug effects*; D016065:Myoelectric Complex, Migrating / Q000187:drug effects*
D000894:Anti-Inflammatory Agents, Non-Steroidal; D005439:Flufenamic Acid