Daily cranberry juice for the prevention of asymptomatic bacteriuria in pregnancy: a randomized, controlled pilot study.
OBJECTIVE
We compared the effects of daily cranberry juice cocktail to those of placebo during pregnancy on asymptomatic bacteriuria and symptomatic urinary tract infections.


METHODS
A total of 188 women were randomized to cranberry or placebo in 3 treatment arms of A-cranberry 3 times daily (58), B-cranberry at breakfast then placebo at lunch and dinner (67), and C-placebo 3 times daily (63). After 27.7% (52 of 188) of the subjects were enrolled in the study the dosing regimens were changed to twice daily dosing to improve compliance.


RESULTS
There were 27 urinary tract infections in 18 subjects in this cohort, with 6 in 4 group A subjects, 10 in 7 group B subjects and 11 in 7 group C subjects (p = 0.71). There was a 57% and 41% reduction in the frequency of asymptomatic bacteriuria and all urinary tract infections, respectively, in the multiple daily dosing group. However, this study was not sufficiently powered at the alpha 0.05 level (CI 0.14-1.39 and 0.22-1.60, respectively, incidence rate ratios). Of 188 subjects 73 (38.8%) withdrew, most for gastrointestinal upset.


CONCLUSIONS
These data suggest there may be a protective effect of cranberry ingestion against asymptomatic bacteriuria and symptomatic urinary tract infections in pregnancy. Further studies are planned to evaluate this effect.
Wing
Deborah A
DA
Department of Obstetrics and Gynecology, University of California, Irvine, Orange, California 92868, USA. mfm@uci.edu
Rumney
Pamela J
PJ
Preslicka
Christine W
CW
Chung
Judith H
JH
D000328:Adult; D001437:Bacteriuria / Q000517:prevention & control*; D001628:Beverages; D005260:Female; D005500:Follow-Up Studies; D005865:Gestational Age; D006801:Humans; D008517:Phytotherapy / Q000379:methods*; D010865:Pilot Projects; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000517:prevention & control*; D011256:Pregnancy Outcome; D012016:Reference Values; D018570:Risk Assessment; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014552:Urinary Tract Infections / Q000517:prevention & control*; D029799:Vaccinium macrocarpon