Manometric Measurement of the Sphincter of Oddi in Patients with Common Bile Duct Stones: A Consecutive Study of the Han Population of China

Table 1

Analysis of SO motor activity stratified by CBD diameter, CBD stone numbers and sizes, prior cholecystectomy, periampullary diverticulum, and symptoms.

Factors	SO motor activity
	Basal SO pressure; (mmHg)	Amplitude; (mmHg)	Frequency; (/min)
CBD diameter
≤10 mm ()
>10 mm ()
value	0.992	0.600	0.333
CBD stone numbers
Single ()
Multiple ()
value	0.198	0.236	0.120
CBD stone size
≤10 mm ()
>10 mm ()
value	0.043	0.683	0.443
cholecystectomy
Yes ()
No ()
value	0.097	0.383	0.775
PAD
Yes ()
No ()
value	0.696	0.975	0.452
Main symptoms
Colicky pain ()
Jaundice ()
Symptoms-free ()
value	0.475	0.683	0.396

SO: sphincter of Oddi, CBD: common bile duct, PAD: periampullary diverticula.
No significant difference in basal SO pressure, amplitude, and frequency compared with the CBD diameter, CBD stone numbers, prior cholecystectomy, periampullary diverticula (PAD), and symptoms. The mean basal SO pressure in patients with CBD stones ≤ 10 mm was significantly higher than in those with larger CBD stones. The differences of SO amplitudes and frequencies were not significant.