Biliary and total extrarenal clearance of inulin and iohexol in pigs. A source of error when determining gfr as body clearance.

• Biliary clearance, total extrarenal clearance, body and renal clearance of inulin and iohexol were determined in 11 normal and 11 nephrectomized pigs. The biliary clearance of inulin, calculated as biliary excretion divided by the plasma concentration, was 0.04 and 0.01 ml min^–1 10 kg^–1 and of iohexol 0.21 and 0.1 ml min^–1 10 kg^–1 , in normal, respectively, nephrectomized pigs (p < 0.05). The extrarenal clearance of inulin, calculated as body minus renal clearance, was 2.7 and 0.7 ml min^–1 10 kg^–1 and of iohexol 3.7 and 0.7 ml min^–1 10 kg^–1 in normal, respectively, nephrectomized pigs (p < 0.05). Some hours after injection of the markers their plasma concentrations were much higher in the nephrectomized pigs. This higher plasma concentration was not matched by an equally higher biliary excretion and therefore biliary clearance decreased. The smaller total extrarenal clearance in nephrectomized pigs, i.e. the overestimation of GFR when calculated as body clearance, indicates that this source of error decreases with decreasing renal function.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)

Keyword

Iohexol: pharmacokinetics

Inulin: pharmacokinetics

Inulin: blood

Glomerular Filtration Rate

Female

Contrast Media: pharmacokinetics

Animal

Common Bile Duct: metabolism

Kidney: metabolism

Kidney: surgery

Male

Metabolic Clearance Rate

Nephrectomy

Swine

Publication and Content Type

art (subject category)

ref (subject category)