Biomaterial Database

Renal handling of carnitine in ill preterm and term neonates. 1995

S Zamora, and N Benador, and G Lacourt, and E Girardin

Department of Pediatrics, University of Geneva, Switzerland.

OBJECTIVE To investigate the renal handling of carnitine in preterm and term ill neonates. METHODS We studied the fractional tubular reabsorption of carnitine and the proximal renal tubular function of infants in the first week of life who were receiving very little or no carnitine in their diets. RESULTS Mean plasma levels were low: total carnitine was 16.4 +/- 7.0 mumol/L, free carnitine was 9.2 +/- 5.0 mumol/L, and acylcarnitine was 7.2 +/- 4.1 mumol/L. The most premature group of neonates (gestation age, 26 to 31 weeks) had a fractional tubular reabsorption rate of free carnitine of 94.3% +/- 3.3%, which was lower than in the other two groups (98.1% +/- 2.4% for gestational age 32 to 36 weeks, p = 0.001; and 99.2% +/- 0.6% for gestational age 37 to 42 weeks, p = 0.002). In all patients the fractional tubular reabsorption of acylcarnitine was lower than that of free carnitine, indicating possible tubular secretion of acylcarnitine. It correlated with the total plasma carnitine levels (r = 0.53; p = 0.002). The fractional tubular reabsorption of free carnitine also correlated with gestational age (r = 0.60; p < 0.001). CONCLUSIONS Ill neonates have a fractional tubular reabsorption rate of free carnitine within the normal range. It increases with gestational age, and has the same maturation rate as the other known indexes of proximal tubular function.

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D007234	Infant, Premature	A human infant born before 37 weeks of GESTATION.	Neonatal Prematurity,Premature Infants,Preterm Infants,Infant, Preterm,Infants, Premature,Infants, Preterm,Premature Infant,Prematurity, Neonatal,Preterm Infant
D007668	Kidney	Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.	Kidneys
D010710	Phosphates	Inorganic salts of phosphoric acid.	Inorganic Phosphate,Phosphates, Inorganic,Inorganic Phosphates,Orthophosphate,Phosphate,Phosphate, Inorganic
D002331	Carnitine	A constituent of STRIATED MUSCLE and LIVER. It is an amino acid derivative and an essential cofactor for fatty acid metabolism.	Bicarnesine,L-Carnitine,Levocarnitine,Vitamin BT,L Carnitine
D003404	Creatinine		Creatinine Sulfate Salt,Krebiozen,Salt, Creatinine Sulfate,Sulfate Salt, Creatinine
D005198	Fanconi Syndrome	A hereditary or acquired form of generalized dysfunction of the PROXIMAL KIDNEY TUBULE without primary involvement of the KIDNEY GLOMERULUS. It is usually characterized by the tubular wasting of nutrients and salts (GLUCOSE; AMINO ACIDS; PHOSPHATES; and BICARBONATES) resulting in HYPOKALEMIA; ACIDOSIS; HYPERCALCIURIA; and PROTEINURIA.	De Toni-Debre-Fanconi Syndrome,Lignac-Fanconi Syndrome,Proximal Renal Tubular Dysfunction,Renal Fanconi Syndrome,Adult Fanconi Syndrome,Fanconi Bickel Syndrome,Fanconi Renotubular Syndrome,Fanconi Syndrome with Intestinal Malabsorption and Galactose Intolerance,Fanconi Syndrome without Cystinosis,Fanconi-Bickel Syndrome,Glycogen Storage Disease XI,Glycogenosis, Fanconi Type,Hepatic Glycogenosis with Amino Aciduria and Glucosuria,Hepatic Glycogenosis with Fanconi Nephropathy,Hepatorenal Glycogenosis with Renal Fanconi Syndrome,Idiopathic De Toni-Debre-Fanconi Syndrome,Luder-Sheldon Syndrome,Neonatal De Toni-Debre-Fanconi Syndrome,Primary Toni-Debre-Fanconi Syndrome,Pseudo-Phlorizin Diabetes,Toni-Debre-Fanconi Syndrome,Bickel Syndrome, Fanconi,Diabete, Pseudo-Phlorizin,Diabetes, Pseudo-Phlorizin,Fanconi Syndrome, Adult,Fanconi Syndrome, Renal,Fanconi Type Glycogenosis,Fanconi-Bickel Syndromes,Lignac Fanconi Syndrome,Luder Sheldon Syndrome,Pseudo Phlorizin Diabetes,Pseudo-Phlorizin Diabete,Renotubular Syndrome, Fanconi,Syndrome, Adult Fanconi,Syndrome, Fanconi,Syndrome, Fanconi Bickel,Syndrome, Fanconi Renotubular,Syndrome, Fanconi-Bickel,Syndrome, Lignac-Fanconi,Syndrome, Luder-Sheldon,Syndrome, Renal Fanconi,Syndromes, Fanconi-Bickel
D005865	Gestational Age	The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated from the onset of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization. It is also estimated to begin from fertilization, estrus, coitus, or artificial insemination.	Embryologic Age,Fetal Maturity, Chronologic,Chronologic Fetal Maturity,Fetal Age,Maturity, Chronologic Fetal,Age, Embryologic,Age, Fetal,Age, Gestational,Ages, Embryologic,Ages, Fetal,Ages, Gestational,Embryologic Ages,Fetal Ages,Gestational Ages
D006029	Glycosuria	The appearance of an abnormally large amount of GLUCOSE in the urine, such as more than 500 mg/day in adults. It can be due to HYPERGLYCEMIA or genetic defects in renal reabsorption (RENAL GLYCOSURIA).
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man