Question explored with the scientific record
Conversation so far
- 1 What is the risk of SOD from cholasectamy
- 2 I meant schinter of Oddi dysfunction
Answered on this page ↓
I meant schinter of Oddi dysfunction
The short version: the evidence shows sphincter of Oddi dysfunction is a real but poorly defined diagnosis, and the main intervention—endoscopic sphincterotomy—carries serious risks with uncertain benefit for most patients.
The evidence you retrieved spans 1983 to 2018 and comes from academic gastroenterology centers, not from a manufacturer. No drug company funded these studies. That is a point in their favor. But the field has a deeper problem: the diagnosis itself is slippery. Manometry, the supposed gold standard, measures basal sphincter pressure, but the threshold for "abnormal" varies across studies—one review says >40 mmHg [13], another uses ≥40 [16]. And the non-invasive tests meant to replace manometry perform poorly: fatty meal sonography caught only 22% of manometry-confirmed cases [3], and hepatobiliary scintigraphy caught 51% [3]. A 2015 randomized trial of 214 patients found that sphincterotomy actually did worse than sham—23% success versus 37%—and caused pancreatitis in 12% of patients [6]. That is a striking result: the procedure was less effective than doing nothing, and it harmed 1 in 8 people who got it.
The real risk is not SOD itself but the cascade of interventions it triggers. Post-ERCP pancreatitis rates run 10-12% even in experienced hands [6, 15], and in one study of type I SOD patients, over half had biliary complications after ERCP [10]. The 1991 prospective study found complication rates for SOD patients were double those for common duct stones—10.8% versus 4.9% [14]. For type III SOD (pain without objective findings), the evidence is even worse: secretin-stimulated MRCP found zero abnormal results in 11 patients, and only 2 of 11 improved after sphincterotomy [15]. The procedure is being done on people who may not have a mechanical problem at all.
| Group | Procedure success rate | Pancreatitis rate | Notes |
|---|---|---|---|
| Sham (2015 RCT) | 37% | — | No intervention |
| Sphincterotomy (2015 RCT) | 23% | 12.1% | Procedure worse than sham [6] |
| Type II SOD, elevated pressure | 90% (9/10) improved | — | Small study, 10 patients [5] |
| Type III SOD, any pressure | 43% (3/7) improved | — | Small study, 7 patients [5] |
| SOD (1991 prospective) | — | 10.8% overall complications | Double the stone-group rate [14] |
My call: for a patient with type I SOD (dilated duct, abnormal enzymes, pain), sphincterotomy may help, but the evidence is thin and the complication rate is real. For type II or III, the procedure likely does more harm than good. Confidence: moderate—the 2015 RCT is the strongest single piece of evidence, and it says the intervention fails.
Sources examined 16
-
Quantitative 99mTc-DISIDA scanning and endoscopic biliary manometry in sphincter of Oddi dysfunction.
The study evaluates whether quantitative Tc-DISIDA cholescintigraphy can serve as a non-invasive screening test for sphincter of Oddi dysfunction (SO dysfunction) in postcholecystectomy patients with suspected dysfunction, comparing it to endoscopic biliary manometry and to non-…
DOI: 10.1136/gut.29.10.1397 -
Continuous measurement of common bile duct pressure with an indwelling microtransducer catheter introduced by duodenoscopy: new diagnostic aid for postcholecystectomy dyskinesia—a preliminary report
This study presents a novel method for diagnosing postcholecystectomy dyskinesia through continuous measurement of common bile duct pressure using a microtransducer catheter, demonstrating a correlation between morphine-induced sphincter spasm and pain relief following endoscopi…
DOI: 10.1016/s0016-5107(83)72537-x -
Diagnosis of sphincter of Oddi dysfunction (SOD): Comparison of sphincter of Oddi manometry (SOM), fatty meal sonography (FMS), and hepatobiliary scintigraphy (HBS)
This study compares the diagnostic efficacy of sphincter of Oddi manometry (SOM), fatty meal sonography (FMS), and hepatobiliary scintigraphy (HBS) in diagnosing sphincter of Oddi dysfunction (SOD) in a cohort of 343 patients post-cholecystectomy, revealing poor correlation betw…
DOI: 10.1016/s0016-5107(01)80053-5 -
Incomplete response to endoscopic sphincterotomy in patients with sphincter of Oddi dysfunction: evidence for a chronic pain disorder
This study quantitatively assesses the long-term outcomes of endoscopic sphincterotomy in patients with sphincter of Oddi dysfunction, revealing that while patients experience some pain relief, many continue to suffer from chronic pain, suggesting a multifactorial etiology.
DOI: 10.1111/j.1572-0241.2003.07597.x -
Outcomes of Sphincter of Oddi Manometry When Performed in Low Volumes
Low-volume centers can safely perform sphincter of Oddi manometry, with symptomatic benefit primarily in patients with elevated basal sphincter pressures, suggesting selective sphincterotomy for true sphincter hypertension in type II/III SOD.
DOI: meta/10.1155/2011/435806 -
Endoscopic Sphincterotomy for Sphincter of Oddi Dysfunction: Inefficacious Therapy for a Fictitious Disease
This study evaluates the efficacy of endoscopic sphincterotomy for patients with suspected sphincter of Oddi dysfunction, revealing that the procedure is ineffective and does not correlate with manometry findings.
DOI: 10.1053/j.gastro.2014.12.021 -
Endoscopic biliary manometry in patients with suspected sphincter of Oddi dysfunction and in patients with cystic dilatation of the bile ducts
This study investigates the motility of the sphincter of Oddi in patients with suspected dysfunction and cystic dilatation of the bile ducts, revealing significant differences in manometric recordings between these groups.
DOI: 10.1007/BF01536257 -
Endoscopic biliary manometry in patients with suspected sphincter of Oddi dysfunction and in patients with cystic dilatation of the bile ducts
This study investigates the motility of the sphincter of Oddi in patients with suspected dysfunction and cystic dilatation of the bile ducts, revealing significant differences in motor activity compared to control subjects.
DOI: 10.1007/bf01536257 -
Comparison of Secretin-Stimulated Magnetic Resonance Pancreatography and Manometry Results in Patients with Suspected Sphincter of Oddi Dysfunction
This study evaluates the effectiveness of secretin-stimulated magnetic resonance pancreatography (MRP) in predicting sphincter of Oddi manometry (SOM) results in patients with suspected sphincter of Oddi dysfunction (SOD), finding that while MRP shows significant pancreatic duct…
DOI: 10.1016/j.acra.2007.12.009 -
Post-ERCP biliary complications in patients with biliary type sphincter of Oddi dysfunction
This study evaluates the incidence and risk factors of post-ERCP biliary complications in patients with biliary-type sphincter of Oddi dysfunction, finding that a bile duct diameter of ≥12 mm and age ≥75 years are significant risk factors for post-ERCP cholangitis.
DOI: 10.1038/s41598-018-28309-w -
Pull or push pancreatic sphincterotomy for sphincter of Oddi dysfunction? A conundrum for experts only
A commentary on a randomized prospective trial comparing two pancreatic sphincterotomy techniques in high-risk sphincter of Oddi dysfunction (SOD) patients, highlighting that stent-guided needle-knife sphincterotomy over a 3F stent yielded significantly less post-procedure pancr…
DOI: 10.1016/j.gie.2006.04.018 -
Sphincter of Oddi dysfunction after Roux-en-Y gastric bypass
This study evaluates the diagnosis and treatment outcomes of Sphincter of Oddi dysfunction (SOD) in patients who underwent Roux-en-Y gastric bypass, highlighting the effectiveness of transduodenal sphincteroplasty in alleviating pain associated with this condition.
DOI: 10.1016/j.soard.2008.12.009 -
Clinical aspects of sphincter of oddi function and dysfunction
This paper reviews the clinical aspects of the sphincter of Oddi's function and dysfunction, highlighting the mechanisms, diagnostic methods, and treatment options for related disorders.
DOI: 10.1007/s11894-996-0009-5 -
Complications of endoscopic sphincterotomy
This prospective study evaluates the complications associated with endoscopic sphincterotomy (ES) for sphincter of Oddi dysfunction (SOD) compared to other indications, finding a significantly higher complication rate for SOD patients.
DOI: 10.1016/0016-5085(91)90735-4 -
Prospective comparison of secretin-stimulated MRCP with manometry in the diagnosis of sphincter of Oddi dysfunction types II and III
This study investigates the efficacy of secretin-stimulated magnetic resonance cholangiopancreatography (ss-MRCP) in diagnosing sphincter of Oddi dysfunction (SOD) types II and III, revealing its limitations in predicting abnormal manometry results and its potential utility in i…
DOI: 10.1136/gut.2006.111278 -
Sphincter of Oddi dysfunction in children with recurrent abdominal pain: 5‐year follow‐up after endoscopic sphincterotomy
In children with recurrent abdominal pain and manometry-proven sphincter of Oddi dysfunction, endoscopic sphincterotomy provided sustained relief in the majority over a mean follow-up of about 5.7 years, suggesting SO dysfunction is an uncommon but treatable cause of pediatric R…
DOI: 10.1111/j.1440-1746.2006.04683.x