Two-Hour Creatinine Clearance and Glomerular Filtration Rate Estimated from Serum Cystatin C and Creatinine in the Elderly to Preoperative Period ()
ABSTRACT
Introduction: The utility of estimates of glomerular filtration rate based on
creatinine and cystatin C serum levels to assess renal function in older
surgical patients remains to be determined. Objective: To determine whether 2h-creatinine clearance
(CrCl-2h) can be an adequate substitute for glomerular filtration rate
estimates obtained by measuring serum cystatin C and creatinine in the elderly
at preoperation. Methods: A total of
102 consecutive elder patients undergoing pre-anesthesia evaluation for routine
surgeries were included. Study subjects were allocated into three groups: Group
1 (G1)—hypertensive diabetic patients, Group 2 (G2)—hypertensive patients, and
Group 3 (G3)—non-hypertensive and non-diabetic patients. Two-hour urine
collection was performed and CrCl-2h adjusted for ultrasonic residual bladder
volume was estimated. GFR was estimated based on creatinine and cystatin C
serum levels. Bland-Altman analysis was used to compare methods. Results: The mean difference between
the evaluated methods and CrCl-2h was <15 mL·min-1·1.73 m-2 for Cys-GFR, and >20 mL·min-1·1.73 m-2 for Cr-GFR in
all groups. CrCl-2h adjusted for ultrasonic
residual bladder volume did not differ from non-adjusted CrCl-2h in none of the
groups. Conclusion: Two-hour creatinine clearance was not an adequate substitute for GFR estimates
based on creatinine and cystatin C serum levels in older patients at
preoperation. The ultrasonic assessment of residual bladder volume had no
significant influence on the calculation of two-hour creatinine clearance.
Share and Cite:
L. da Silva, P. Galvão Vianna, M. Takaku, G. Mizubuti and Y. Machado Castiglia, "Two-Hour Creatinine Clearance and Glomerular Filtration Rate Estimated from Serum Cystatin C and Creatinine in the Elderly to Preoperative Period,"
Open Journal of Nephrology, Vol. 3 No. 4, 2013, pp. 184-188. doi:
10.4236/ojneph.2013.34032.
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