Circadian variations in the risk of urinary calcium oxalate stone formation.
OBJECTIVE
To evaluate the circadian fluctuations in the risk of urinary calcium oxalate stone formation with regard to critical periods of crystallization.


METHODS
Over a given time period, the Tiselius index depends on urine volume and urinary excretion of oxalate, calcium, citrate and magnesium. This crystallization potential was evaluated during three successive periods spread over 24 h for 25 recurrent stone-formers aged 16-76 years (mean 50) and 25 control subjects aged 27-71 years (mean 44).


RESULTS
There was no significant difference in the value of the Tiselius index for all equivalent time periods in both groups of patients. The minimum value was recorded in the afternoon and the circadian pattern of the index illustrated the predominant importance of urinary output in its determination. Morning urinary concentrations and excretions of citrate, and nocturnal levels of magnesium were significantly higher in the stone-formers when compared with the control subjects.


CONCLUSIONS
The lithogenic risk for calcium oxalate stones was maximal at the end of the night or during the early morning, when urinary output was minimal. This circadian study revealed abnormalities that are not apparent from non-fractionated 24 h urine samples, and which were potentially relevant to therapy.
Department of Urology, Hôpital Lapeyronie, Montpellier, France.
M
M
Robert
J O
JO
Roux
F
F
Bourelly
A M
AM
Boularan
J
J
Guiter
L
L
Monnier
D000293:Adolescent; D000328:Adult; D000368:Aged; D002118:Calcium / Q000652:urine; D002129:Calcium Oxalate / Q000378:metabolism* / Q000652:urine; D002940:Circadian Rhythm; D003460:Crystallization; D005260:Female; D006801:Humans; D008274:Magnesium / Q000652:urine; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012307:Risk Factors; D014545:Urinary Calculi / Q000209:etiology* / Q000378:metabolism / Q000652:urine
D002129:Calcium Oxalate; D008274:Magnesium; D002118:Calcium