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Comparison of etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West.

Abstract

BACKGROUND AND AIMS

Colonic diverticula are located predominantly on the right-side in patients in Japan, in contrast to those in Europe and the United States. This study compared the etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West.

METHODS

A literature review was conducted from 1950 to 2001 using Medline and Index Medicus.

RESULTS

Diverticula occur predominantly in the right-sided colon (over 70%) in Japanese patients, and even among Japanese who emigrate, in contrast with the diverticula in Western. Incidence (detection) rates of colon diverticula have rapidly increased in Japan since World War II with the increased dietary fiber intake. The increased detection rate over time is higher in urban areas than in rural areas, and it corresponds to the distribution of dietary fiber intake. Birth cohort analysis suggests that right-sided diverticula is affected more by environmental factors than other types. Furthermore, the significant relationship of right-sided diverticula with intraluminal pressure in Japan is similar to that of left-sided diverticula in the West, and the pathological feature of these diverticula are similar.

CONCLUSION

The etiology of right-sided diverticula in Japan (and perhaps also other Mongolian peoples) is very similar to that of left-sided diverticula in the West. The location may represent a difference in morphology of the large intestine between Mongolians (including Japanese), and Westerners, rather than environmental differences.

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  • Authors+Show Affiliations

    ,

    Department of Hygiene, Hirosaki University School of Medicine, Zaifu-cho 5, Hirosaki, 036-8562 Japan. nakaji@cc.hirosaki-u.ac.jp

    , , , , ,

    Source

    MeSH

    Age Distribution
    Cohort Studies
    Colon
    Cross-Cultural Comparison
    Dietary Fiber
    Diverticulum, Colon
    Europe
    Feeding Behavior
    Humans
    Incidence
    Japan
    Pressure
    United States

    Pub Type(s)

    Journal Article
    Review

    Language

    eng

    PubMed ID

    12355211

    Citation

    Nakaji, Shigeyuki, et al. "Comparison of Etiology of Right-sided Diverticula in Japan With That of Left-sided Diverticula in the West." International Journal of Colorectal Disease, vol. 17, no. 6, 2002, pp. 365-73.
    Nakaji S, Danjo K, Munakata A, et al. Comparison of etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West. Int J Colorectal Dis. 2002;17(6):365-73.
    Nakaji, S., Danjo, K., Munakata, A., Sugawara, K., MacAuley, D., Kernohan, G., & Baxter, D. (2002). Comparison of etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West. International Journal of Colorectal Disease, 17(6), pp. 365-73.
    Nakaji S, et al. Comparison of Etiology of Right-sided Diverticula in Japan With That of Left-sided Diverticula in the West. Int J Colorectal Dis. 2002;17(6):365-73. PubMed PMID: 12355211.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Comparison of etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West. AU - Nakaji,Shigeyuki, AU - Danjo,Kazuma, AU - Munakata,Akihiro, AU - Sugawara,Kazuo, AU - MacAuley,Domhnall, AU - Kernohan,George, AU - Baxter,David, Y1 - 2002/05/09/ PY - 2002/02/21/accepted PY - 2002/10/2/pubmed PY - 2003/4/11/medline PY - 2002/10/2/entrez SP - 365 EP - 73 JF - International journal of colorectal disease JO - Int J Colorectal Dis VL - 17 IS - 6 N2 - BACKGROUND AND AIMS: Colonic diverticula are located predominantly on the right-side in patients in Japan, in contrast to those in Europe and the United States. This study compared the etiology of right-sided diverticula in Japan with that of left-sided diverticula in the West. METHODS: A literature review was conducted from 1950 to 2001 using Medline and Index Medicus. RESULTS: Diverticula occur predominantly in the right-sided colon (over 70%) in Japanese patients, and even among Japanese who emigrate, in contrast with the diverticula in Western. Incidence (detection) rates of colon diverticula have rapidly increased in Japan since World War II with the increased dietary fiber intake. The increased detection rate over time is higher in urban areas than in rural areas, and it corresponds to the distribution of dietary fiber intake. Birth cohort analysis suggests that right-sided diverticula is affected more by environmental factors than other types. Furthermore, the significant relationship of right-sided diverticula with intraluminal pressure in Japan is similar to that of left-sided diverticula in the West, and the pathological feature of these diverticula are similar. CONCLUSION: The etiology of right-sided diverticula in Japan (and perhaps also other Mongolian peoples) is very similar to that of left-sided diverticula in the West. The location may represent a difference in morphology of the large intestine between Mongolians (including Japanese), and Westerners, rather than environmental differences. SN - 0179-1958 UR - https://www.unboundmedicine.com/medline/citation/12355211/full_citation L2 - https://dx.doi.org/10.1007/s00384-002-0403-x DB - PRIME DP - Unbound Medicine ER -