Concentration and/or excretion values of litholytic urinary parameters (magnesium, citrate, sodium) tend to decrease under the influence of stress. The experimental results presented give a contribution to the knowledge on stress-induced urinary changes. All factors considered, the increased risk of stone formation is effective on the day of stress exposure and the following day. A quotient composed of the lithogenous and the litholytic urinary parameters may be condensed into a ‘stress formula’ which attributes a sharply increased risk of stone formation of calcium oxalate stone patients to stress influence.

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