Symptoms and visceral perception in severe functional and organic dyspepsia.
BACKGROUND
Hypersensitivity of gastric afferent pathways may play an aetiological role in symptoms of functional dyspepsia.


OBJECTIVE
To determine whether patients with severe organic dyspepsia (associated with tissue irritation/injury) and those with functional dyspepsia (no detectable tissue irritation) differ in their perception of gastric distension and whether this difference is reflected in differences in their gastrointestinal and psychological symptoms.


METHODS
Perceptual thresholds, referral patterns, and gastrointestinal and psychological symptoms were compared in 23 patients with functional dyspepsia, 10 organic dyspeptics, and 15 healthy controls.


RESULTS
Fifteen (65%) functional dyspeptics and no organic dyspeptics had reduced perceptual thresholds for fullness, discomfort, or pain (odds ratio (OR) 19.56, 95% confidence interval (CI) 1.95 to 476.09, p = 0.0017). Either reduced perceptual thresholds or altered referral was found in 20 (87%) functional dyspeptics and four (20%) organic dyspeptics (OR 10.0, 95% CI 1.34 to 89.54, p = 0.014). During sham distension fullness, discomfort and pain were reported by healthy controls, organic dyspeptics, and functional dyspeptics. A sham response of pain but no other sensation was more frequent among functional dyspeptics (43%) than healthy controls (7%) (OR 10.77, 95% CI 1.10 to 257.35, p = 0.026). Gastrointestinal and psychological symptoms and gastric compliance were similar in the functional and organic groups.


CONCLUSIONS
Alterations in the perception of gastric distension distinguishes between functional and organic dyspepsia, while symptoms do not. A total of 87% of functional dyspeptics studied had evidence of altered visceral afferent function. In this study population, psychological abnormalities or changes in compliance did not explain the findings.
Mertz
H
H
Digestive Disease Research Center/Neuroenteric Disease Program, UCLA 90073, USA.
Fullerton
S
S
Naliboff
B
B
Mayer
E A
EA
D000328:Adult; D000344:Afferent Pathways; D000368:Aged; D002404:Catheterization; D004415:Dyspepsia / Q000503:physiopathology / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D017288:Pain Threshold; D012684:Sensory Thresholds; D013270:Stomach / Q000294:innervation / Q000503:physiopathology*