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Appendiceal microbiome in uncomplicated and complicated acute appendicitis: A prospective cohort study

Grönroos Juha; Sippola Suvi; Hakanen Antti J; Kallonen Teemu; Vanhatalo Sanja; Munukka Eveliina; Salminen Paulina; Haijanen Jussi

Appendiceal microbiome in uncomplicated and complicated acute appendicitis: A prospective cohort study

Grönroos Juha
Sippola Suvi
Hakanen Antti J
Kallonen Teemu
Vanhatalo Sanja
Munukka Eveliina
Salminen Paulina
Haijanen Jussi
Katso/Avaa
journal.pone.0276007.pdf (1.626Mb)
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doi:10.1371/journal.pone.0276007
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022110164036
Tiivistelmä

Uncomplicated and complicated acute appendicitis seem to be two different forms of this common abdominal emergency. The contribution of appendiceal microbiota to appendicitis pathogenesis has been suggested, but differences between uncomplicated and complicated appendicitis are largely unknown. We compared the appendiceal microbiota in uncomplicated and complicated acute appendicitis.\nThis prospective single-center clinical cohort study was conducted as part of larger multicenter MAPPAC trial enrolling adult patients with computed tomography or clinically confirmed uncomplicated or complicated acute appendicitis. The microbial composition of the appendiceal lumen was determined using 16S rRNA gene amplicon sequencing.\nBetween April 11, 2017, and March 29, 2019, 118 samples (41 uncomplicated and 77 complicated appendicitis) were available. After adjusting for age, sex, and BMI, alpha diversity in complicated appendicitis was higher (Shannon p = 0.011, Chao1 p = 0.006) compared to uncomplicated appendicitis. Microbial compositions were different between uncomplicated and complicated appendicitis (Bray-Curtis distance, P = 0.002). Species poor appendiceal microbiota composition with specific predominant bacteria was present in some patients regardless of appendicitis severity.\nUncomplicated and complicated acute appendicitis have different appendiceal microbiome profiles further supporting the disconnection between these two different forms of acute appendicitis.\nClinicalTrials.gov NCT03257423.

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