Volvulus of the sigmoid colon.
OBJECTIVE
The current status of sigmoid volvulus (SV) was reviewed to assess trends in management and to assess the literature.


METHODS
The literature on SV was retrieved using PubMed, Embase, Scopus, Pakmedinet, African Journals online (AJOL), Indmed and Google scholar. These databases were searched for text words including 'sigmoid', 'colon' and 'volvulus'. Relevant nonindexed surgical journals published from endemic countries were also manually searched. We focused on original articles published within the last 10 years; but classical references prior to this period were also included. Seminal papers published in non-English languages were also included.


RESULTS
Sigmoid volvulus is a leading cause of acute colonic obstruction in South America, Africa, Eastern Europe and Asia. It is rare in developed countries such as USA, UK, Japan and Australia. Characteristic geographic variations in the incidence, clinical features, prognosis and comorbidity of SV justify recognition of endemic and sporadic subtypes. Controversy on aetiologic agents can be minimized by classifying them into 'predisposing' and 'precipitating' factors. Modern imaging systems, although more effective than plain radiographs, are yet to gain popularity. Emergency endoscopic reduction is the treatment of choice in uncomplicated patients. But it is only a temporizing procedure, and it should be followed in most cases by elective definitive surgery. Resection of the redundant sigmoid colon is the gold standard operation. The role of newer nonresective alternatives is yet to be ascertained. Although emergency resection with primary anastomosis (ERPA) has been controversial in the past, it is now increasingly accepted as a safe option with superior results. Management in elderly debilitated patients is extremely difficult. Paediatric SV significantly differs from that in adults. SV is frequently associated with neuropsychiatric diseases, diabetes mellitus and Chagas disease. The overall mortality in recent studies is < 5%.


CONCLUSIONS
There are almost no randomised controlled studies. According to the grading system of Oxford Center for Evidence Based Medicine (CEVM), available published evidence is at level 4. The recommendations resulting form this review are of 'C' grade.
Division of Pediatric Surgery, Annamalai University, Tamilnadu, India. vrthiran@yahoo.co.in
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Raveenthiran
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Madiba
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Atamanalp
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D000818:Animals; D003952:Diagnostic Imaging / Q000379:methods*; D014943:Global Health; D006801:Humans; D015994:Incidence; D045822:Intestinal Volvulus / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D012810:Sigmoid Diseases / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D012812:Sigmoidoscopy / Q000379:methods*