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Parkinsonism Relat Disord. 2014 May;20(5):535-40. doi: 10.1016/j.parkreldis.2014.02.019. Epub 2014 Mar 2.

Small intestinal bacterial overgrowth in Parkinson's disease.

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Faculty of Medicine (Divisions of Neurology and Gastroenterology), University of Malaya, Kuala Lumpur, Malaysia.
Department of Gastroenterology, Central Clinical School, Monash University and Alfred Hospital, Melbourne, Australia.
Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia.
Morton and Gloria Shulman Movement Disorders Centre, Toronto Western Hospital and the Edmond J. Safra Program in Parkinson's Disease Research, University of Toronto, Toronto, Canada.
Faculty of Medicine (Divisions of Neurology and Gastroenterology), University of Malaya, Kuala Lumpur, Malaysia. Electronic address:



Recent studies reported a high prevalence of small intestinal bacterial overgrowth (SIBO) in Parkinson's disease (PD), and a possible association with gastrointestinal symptoms and worse motor function. We aimed to study the prevalence and the potential impact of SIBO on gastrointestinal symptoms, motor function, and quality of life in a large cohort of PD patients.


103 Consecutive PD patients were assessed using the lactulose-hydrogen breath test; questionnaires of gastrointestinal symptoms and quality of life (PDQ-39); the Unified PD Rating Scale (UPDRS) including "on"-medication Part III (motor severity) score; and objective and quantitative measures of bradykinesia (Purdue Pegboard and timed test of gait). Patients and evaluating investigators were blind to SIBO status.


25.3% of PD patients were SIBO-positive. SIBO-positive patients had a shorter mean duration of PD (5.2 ± 4.1 vs. 8.1 ± 5.5 years, P = 0.007). After adjusting for disease duration, SIBO was significantly associated with lower constipation and tenesmus severity scores, but worse scores across a range of "on"-medication motor assessments (accounting for 4.2-9.0% of the variance in motor scores). There was no association between SIBO and motor fluctuations or PDQ-39 Summary Index scores.


This is the largest study to date on SIBO in PD. SIBO was detected in one quarter of patients, including patients recently diagnosed with the disease. SIBO was not associated with worse gastrointestinal symptoms, but independently predicted worse motor function. Properly designed treatment trials are needed to confirm a causal link between SIBO and worse motor function in PD.


Gastrointestinal dysfunction; Parkinson's disease/Parkinsonism; Small intestinal bacterial overgrowth

[Indexed for MEDLINE]

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