[Urine specific gravity during general anesthesia].
BACKGROUND
The urine volume and urine specific gravity per unit time during a short operation under volume loading were examined to explore the possibility of urine specific gravity as an indirect index of fluid therapy.


METHODS
After introducing anesthesia, under volume loading with acetic acid Ringer solution 10 ml x kg(-1) x hr(-1), urine volume and specific gravity per unit time at 30 min intervals from urination to 90 min later and the correlation between the urine volume and urine specific gravity were examined. A chronological increase of urine specific gravity was also confirmed. Therefore, the values of urine specific gravity of each 30 minute intervals were compared using Student's t-test.


RESULTS
The urine volume and urine specific gravity per unit time showed no significant negative correlation until after 90 min. Increasing urine specific gravity even under volume loading became significant 90 min after urination.


CONCLUSIONS
There is a possibility of employing urine specific gravity as an indirect index of fluid therapy.
Kinoshita
Maho
M
Department of Anesthesiology, Tokyo Women's Medical University, Tokyo.
Morioka
Nobutada
N
Nozaki
Chisato
C
Abe
Mikiko
M
Yamada
Arata
A
Ozaki
Makoto
M
D000328:Adult; D000368:Aged; D000768:Anesthesia, General; D005260:Female; D005440:Fluid Therapy; D006801:Humans; D007552:Isotonic Solutions / Q000008:administration & dosage; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D013046:Specific Gravity; D014556:Urine
D007552:Isotonic Solutions; C028570:Ringer's acetate