Measurement of Glomerular Filtration Rate in Premature Infants 12

Barnett, Henry L.; Hare, Kendrick; McNamara, Helen; Hare, Ruth S.

doi:10.1172/jci102017

Cited by 81 publications

(31 citation statements)

References 20 publications

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“…Clinical data relevant to the observations presented here are included in Table I (9), in blood and urine, and the catheterization and infusion technic used for short-term simultaneous clearances have been described (8). Serum and urine thiosulfate concentrations were determined by the method of Newman, Gilman, and Phillips (10).…”

Section: Methodsmentioning

confidence: 99%

The Effect of Adrenocorticotrophic Hormone on Children With the Nephrotic Syndrome. Ii. Physiologic Observations on Discrete Kidney Functions and Plasma Volume 1

Barnett¹,

Forman²,

McNamara³

et al. 1951

J. Clin. Invest.

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Section: Methodsmentioning

confidence: 99%

The Effect of Adrenocorticotrophic Hormone on Children With the Nephrotic Syndrome. Ii. Physiologic Observations on Discrete Kidney Functions and Plasma Volume 1

Barnett¹,

Forman²,

McNamara³

et al. 1951

J. Clin. Invest.

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“…Preterm neonates (n = 20): gestational age = 27-37 weeks; chronological age = 0.3-4.2 weeks; body weight = 0.68-2.25 kg; GFR = 0.5-2.74 mL/min (13); Term neonates (n = 15): gestational age = 38-42 weeks; chronological age = 0.3-2 weeks; body weight = 1.04-4.64 kg; GFR = 1.38-8.4 mL/min (14,15); Infants (n = 18): chronological age = 1.9-15 months; body weight = 6-11 kg; GFR = 6-37 mL/min (16); Children (n = 20): chronological age = 2.75-16 years; body weight = 13-51 kg; GFR = 31-114 mL/min; and (17,18); Adults (n = 20): chronological age = 25-49 years; body weight = 51-84 kg; GFR = 87-167 mL/min (19).…”

Section: Development Of the Modelsmentioning

confidence: 99%

Prediction of Human Glomerular Filtration Rate from Preterm Neonates to Adults: Evaluation of Predictive Performance of Several Empirical Models

Mahmood

Staschen

2016

AAPS J

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Abstract. The objective of this study was to evaluate the predictive performance of several allometric empirical models (body weight dependent, age dependent, fixed exponent 0.75, a data-dependent single exponent, and maturation models) to predict glomerular filtration rate (GFR) in preterm and term neonates, infants, children, and adults without any renal disease. In this analysis, the models were developed from GFR data obtained from inulin clearance (preterm neonates to adults; n = 93) and the predictive performance of these models were evaluated in 335 subjects (preterm neonates to adults). The primary end point was the prediction of GFR from the empirical allometric models and the comparison of the predicted GFR with measured GFR. A prediction error within ±30% was considered acceptable. Overall, the predictive performance of the four models (BDE, ADE, and two maturation models) for the prediction of mean GFR was good across all age groups but the prediction of GFR in individual healthy subjects especially in neonates and infants was erratic and may be clinically unacceptable.

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“…Recent in vivo studies provided evidence that the restricted urinary concentrating capacity of the neonatal kidney results from the inability of the medullary cyclic adenosine 3':5'-monophosphate (CAMP) system to accumulate cAMP sufficiently in the presence of antidiuretic hormone (ADH) (14) in addition to the reduced glomerular filtration rate (2). the structural immaturity of the loop of Henle (5), and the low excretion rate of urea (7).…”

mentioning

confidence: 99%

“…Some observations indicate that the unresponsiveness of the cAMP system to ADH may result not only from a functional immaturity of the medullary adenylate cyclase (20,22), but additionally from the interference of renal prostaglandins (PGs) of the E-series with the hydro-osmotic action of ADH. This view is based on the following observations: (1) in isolated collecting ducts, the effect of ADH on the water permeability was blunted when PGEl was applied (10); (2) conversely, in adult mammals when PG synthesis was inhibited the effect of ADH on water reabsorption was increased (1, 3. 8.…”

mentioning

confidence: 99%

Studies on the Immaturity of the ADH-Dependent cAMP System in Conscious Newborn Piglets—Possible Impairing Effects of Renal Prostaglandins

1981

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SummaryIn 24 conscious newborn piglets the effects of 20 &kg body weight IV 1-deamino-&~-arginine-vasopressin (DDAVP) in group 1, 5 mg/kg P O indomethacin in group 2, and the combined effects of both drugs in group 3 were studied by measuring urinary flow rate. urinary osmolality, creatinine clearance, total urinary and nephrogenols cyclic-adknosine 3':s'-monophosphate (CAMP) excretion. medullary cAMP content. and renal prostaglandin (PG)E2 and PGF2,, excreiion. DDAVP alone had no-signifilcant effects on the above parameters, whereas indomethacin alone reduced only the PG excretion significantly. When both drugs were administered simultaneously, urinary concentration increased significantly Recent in vivo studies provided evidence that the restricted urinary concentrating capacity of the neonatal kidney results from the inability of the medullary cyclic adenosine 3':5'-monophosphate (CAMP) system to accumulate cAMP sufficiently in the presence of antidiuretic hormone (ADH) (14) in addition to the reduced glomerular filtration rate (2). the structural immaturity of the loop of Henle (5), and the low excretion rate of urea (7). Some observations indicate that the unresponsiveness of the cAMP system to ADH may result not only from a functional immaturity of the medullary adenylate cyclase (20,22), but additionally from the interference of renal prostaglandins (PGs) of the E-series with the hydro-osmotic action of ADH. This view is based on the following observations: (1) in isolated collecting ducts, the effect of ADH on the water permeability was blunted when PGEl was applied (10); (2) conversely, in adult mammals when PG synthesis was inhibited the effect of ADH on water reabsorption was increased (1, 3. 8. 17).High concentrations of PGs were found in urine of fetal lambs (23). and high PGEl levels were inversely correlated with urinary cAMP excretion in premature infants (15). If a relatively high PGE? formation in the kidney of neonates is indeed a restrictive parameter for renal medullary cAMP accumulation, it should be possible to increase the effect of ADH on urinary concentration by inhibiting PG synthesis.Therefore. we measured urinary concentration in newborn piglets, both before and after the administration of either DDAVP or indomethacin alone and after administration of DDAVP plus indomethacin. The studies were performed in conscious animals because it has been shown that in the unanaesthetized animal indomethacin does not change renal blood flow (24), whereas administration of this drug in the anaesthetized dog is associated with a marked fall in renal blood flow (16). MATERIALS A N D METHODS EXPERIMENTALStudies were carried out on 24 male conscious piglets (strain. Deutsche Landrasse) within the first 24 hr after birth. The animals weighed between 1000 and 1700 g and had free access to suck. The following protocol was used.Control Period. In all animals used. first all urine in the bladder was removed by puncturing the bladder suprapubically. Then the urethra was closed by glue and plaster, and each ...

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Measurement of Glomerular Filtration Rate in Premature Infants 12

Cited by 81 publications

References 20 publications

The Effect of Adrenocorticotrophic Hormone on Children With the Nephrotic Syndrome. Ii. Physiologic Observations on Discrete Kidney Functions and Plasma Volume 1

The Effect of Adrenocorticotrophic Hormone on Children With the Nephrotic Syndrome. Ii. Physiologic Observations on Discrete Kidney Functions and Plasma Volume 1

Prediction of Human Glomerular Filtration Rate from Preterm Neonates to Adults: Evaluation of Predictive Performance of Several Empirical Models

Studies on the Immaturity of the ADH-Dependent cAMP System in Conscious Newborn Piglets—Possible Impairing Effects of Renal Prostaglandins

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