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Biomedical subjects

G Putet

Publications and source records attributed to G Putet.

At least 55 records · Page 3Linked to original sources
PubMed1994

Plasma amino acid and protein concentrations in infants fed human milk or a whey protein hydrolysate formula during the first month of life.

The aim of the study was to compare growth parameters, biochemical indices of protein metabolism and plasma amino acid concentrations in infants fed either human milk (n = 12) or a whey protein hydrolysate formula (n = 13) during the first month of life. Growth and gain in skin fold thickness were similar in both groups whereas serum protein concentration was significantly decreased (57.4 +/- 3.9 versus 61.2 +/- 2.9 g/l) in the infants fed the whey hydrolysate formula. The discrepancies between the plasma amino acid pattern of the whey hydrolysate formula group and that of the human milk group lessened during the first month. Nevertheless, at a mean age of 33 days the plasma threonine concentration remained twice as high and the plasma tyrosine, phenylalanine and proline concentrations were significantly lower in the whey hydrolysate formula group than in the human milk group. Thus, compared with breast-fed infants, growth and most of the biological indices of protein metabolism were satisfactory in infants fed during the first month of life on a whey protein hydrolysate formula. Nevertheless, the decrease in total plasma protein concentration needs to be confirmed in a larger cohort of infants. In addition, further research is necessary to investigate the possible ways of reducing the hyperthreoninemia and preventing other plasma amino acid disturbances since it would be desirable to obtain plasma amino acid levels similar to those of breast-fed infants.

Amino Acids↗
PubMed1994

Nutritional evaluation of various protein hydrolysate formulae in term infants during the first month of life.

The aim of the study was to compare, during the first month of life, growth parameters, biochemical indices of protein metabolism and plasma amino acid concentrations in newborn infants fed either human milk (n = 23), three different whey hydrolysate formulae (WHF 1, n = 13; WHF 2, n = 10; WHF 3, n = 13), a soy-collagen hydrolysate formula (SCHF n = 18) or a whey-casein hydrolysate formula (WCHF, n = 20). Growth parameters and the various protein concentrations determined in the infants fed WHF 1 and WHF 2 were similar to the values observed with human milk. With WHF 3, growth in weight, length and head circumference and serum total protein concentrations were reduced significantly whereas blood urea nitrogen was increased. With SCHF, growth in weight and length as well as serum total protein and transferrin concentration were decreased significantly, whereas serum IgG concentration was increased. With WCHF growth in length and serum transferrin concentration were decreased compared to the human milk group. In the various groups, the plasma amino acid pattern reflected the amino acid content of the formula. Whey hydrolysate formula induced mainly an increase in threonine and a decrease in tyrosine concentrations. Soy-collagen hydrolysate formula led to an increase of non-essential amino acids, such as glycine and hydroxyproline, and a decrease in plasma lysine and cystine. Whey-casein hydrolysate formula induced a plasma amino acid pattern close to the profile observed with human milk. Nevertheless, the plasma concentrations of most of the various amino acids were higher.(ABSTRACT TRUNCATED AT 250 WORDS)

Amino Acids↗
PubMed1994

Metabolic and energy balance in small- and appropriate-for-gestational-age, very low-birth-weight infants.

This study compared nutrient utilization and postnatal weight gain composition in eight appropriate for gestational age (AGA: birth weight 1293 +/- 107 g; gestational age 28.8 +/- 1.4 weeks) and eight symmetrically growth-retarded (SGA: birth weight 1110 +/- 230 g; gestational age 32.7 +/- 1.9 weeks), very low-birth-weight (VLBW) infants. There was no significant difference in protein, mineral and energy intake between AGA and SGA infants. Nitrogen absorption (84 +/- 3 and 83 +/- 4%) and nitrogen retention (356 +/- 48 and 352 +/- 43 mg/kg/day) were similar in both groups. Fat absorption tended to be lower in AGA (78 +/- 15%) than in SGA (87 +/- 4%) infants. Calcium, phosphorus and magnesium absorptions were similar in AGA and SGA infants. Metabolizable energy utilization was similar in both groups; about 55% was expended and 45% stored in new tissues. Energy expenditure was 58 +/- 4 kcal/kg/day in SGA infants and 61 +/- 9 kcal/kg/day in AGA infants. Weight gain and its composition were similar in both groups. We conclude that nutrient and energy utilization are similar in AGA and symmetrically growth-retarded, VLBW infants.

Energy Metabolism↗
PubMed1994

Red blood cell fatty acid composition in low-birth-weight infants fed either human milk or formula during the first months of life.

The fatty acid composition of red blood cell (RBC) phospholipids in low-birth-weight infants was determined immediately after delivery and during the first 3 months of life. In the first study, infants were fed either human milk or two formulas with different fatty acid compositions but no long chain polyunsaturated fatty acids (LCPUFA). Both groups of formula-fed infants had significantly lower levels of docosahexaenoic acid (DHA) in RBC phospholipids compared with breast-fed infants. RBC phospholipid DHA was similar in the two formula groups at all ages. In the second study, infants received either a non-supplemented or a LCPUFA-supplemented formula. DHA remained stable in RBC phospholipids of infants supplemented with LCPUFA, whereas DHA decreased in RBC phospholipids of unsupplemented infants. These results confirm that adding DHA to formulas is more effective than increasing 18:3 n-3 content, in maintaining RBC phospholipid DHA levels.

Breast Feeding↗
PubMed1994

Mineral balance and whole body bone mineral content in very low-birth-weight infants.

Fat and mineral metabolic balance studies were performed in 25 normal very low-birth-weight infants (< or = 1500 g at birth) fed either pooled pasteurized human milk supplemented with calcium, phosphorus and magnesium, or a preterm formula. Calcium, phosphorus and magnesium intake were similar in both groups and averaged 100 mg/kg/day, 72 mg/kg/day and 8 mg/kg/day, respectively. Calcium and phosphorus retention was higher in the subjects fed fortified human milk than in those receiving a preterm formula (65 +/- 14 and 62 +/- 9 mg/kg/day versus 55 +/- 12 and 47 +/- 7 mg/kg/day respectively). The difference was only significant for phosphorus. Magnesium retention was similar in the two groups and averaged 3 mg/kg/day. Fat intake and absorption was significantly higher in the preterm formula fed group than in the one fed fortified human milk (5.5 +/- 0.4 g/kg/day and 88 +/- 4% versus 4.2 +/- 1 g/kg/day, 79 +/- 6% respectively). Assessment of the whole body bone mineral content by dual energy X-ray absorptiometry was performed at 3 and 6 months of age in another group of 25 low-birth-weight infants fed either fortified human milk or a preterm formula. Whole body bone mineral content (BMCt) was low (43.3 +/- 30.8 g of hydroxyapatite) at 3 months of age (theoretical term) compared to normal full-term newborns at birth. There was no significant influence of the diet. At 6 months of age, BMCt reached 168.6 +/- 36.6 g, a value similar to that of full-term newborns, with no significant difference between the two regimen groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Bone Density↗
PubMed1993

[High frequency ventilation by oscillation].

The basic principles and indications of high frequency oscillatory ventilation are presented. The authors have used this technics in more than 400 neonates with respiratory failure. High frequency oscillatory ventilation appears as a simple, efficient and safe method of ventilation in the treatment of neonatal respiratory distress.

Hernia, Diaphragmatic↗
PubMed1992

Net calcium absorption in premature infants: results of 103 metabolic balance studies.

Net calcium absorption was evaluated in 103 low-birth-weight preterm infants by a 72-h balance technique. At birth the infants had a mean (+/- SE) gestational age of 30.9 +/- 0.2 wk and weighed 1.43 +/- 0.03 kg. When tested 3 wk later, their net calcium absorption averaged 58 +/- 1% with an intake of 80 +/- 2 mg Ca.kg body wt-1.d-1. Of the 103 infants, 58 had been fed low-birth-weight formulas supplemented with vitamin D. The remainder received banked human milk, of whom 34 were supplemented with vitamin D and calcium; 11 infants received no supplementation. Calcium absorption in the four subgroups did not differ significantly, with neither vitamin D supplementation nor supplementation with vitamin D and calcium affecting percent absorption significantly. Net calcium absorption was a linear function of intake (40-130 mg Ca.kg body wt-1.d-1) with a zero intercept. Because vitamin D supplementation did not increase net calcium absorption, it is concluded that in preterm low-birth-weight infants calcium absorption proceeds by a nonsaturable route, with the transcellular, vitamin D-regulated mechanism not yet expressed.

Calcium↗
PubMed1992

Leucine kinetics in fed low-birth-weight infants: importance of splanchnic tissues.

Whole body Leu kinetics were determined in fed low-birth-weight (LBW) infants. To assess the importance of first-pass splanchnic extraction of ingested amino acids, two tracers were simultaneously infused by intravenous (L-[1-13C]Leu) and intragastric (L-[5,5,5-2H3]Leu) routes in 13 LBW infants [1,742 +/- 169 (SE) g] fed with protein-enriched human milk (protein intake 3.23 +/- 0.97 g.kg-1.day-1). Splanchnic extraction estimated from plasma [2H3]Leu appearance was 48.2 +/- 15.6% of Leu intake. Total Leu flux, endogenous Leu flux (index of protein catabolism), and nonoxidative Leu disposal (NOLD, index of protein synthesis) were 3.45 +/- 0.57, 1.90 +/- 0.74, and 2.54 +/- 0.62 mumol.kg-1.min-1, respectively. Higher estimates were obtained when using alpha-ketoisocaproate as a precursor pool. There was a wide individual variation of protein intake due to the use of human milk, and, over this range, Leu intake was correlated negatively with endogenous Leu flux (r = 0.88, P less than 0.01) whereas NOLD remained fairly constant. Thus, in LBW infants, 1) splanchnic extraction is two times as high as in adults and might reflect an elevated splanchnic protein turnover and 2) increasing protein intake probably promotes protein gain mainly by inhibiting protein catabolism.

Animals↗
PubMed1991

[Antibiotherapy of maternal-fetal infections].

The initial antibiotic therapy of neonatal infections must be aimed at Streptococcus B, E. coli and Listeria which are the most frequent responsible pathogens. It must be initiated promptly and be effective against a possible meningeal infection. The first-line therapy with amoxicillin, amikacin and cefotaxime, which in theory should cover all the micro-organisms involved, must be short and rapidly replaced by an antibiotic proved to be active against the isolated pathogen. If aminoglycosides are administered for a long time, serum level assays are recommended for optimal safety.

Anti-Bacterial Agents↗
PubMed1991

Oxygen consumption during sleep in children under continuous and cyclic nutrition.

The present study investigated the effects of two modalities of parenteral nutrition (continuous nutrition over the 24-hour period vs. cyclic nutrition, i.e., administered only during the night) on O2 consumption during sleep in children affected by severe gastrointestinal diseases. In both feeding modalities O2 consumption was always highest in REM sleep, intermediate in stage 2 and lowest in SWS. The trends during the night of O2 consumption (an increase from the second to the third part of the night) for different sleep stages were comparable in both feeding modalities. These results suggest that O2 consumption is not affected by the feeding modalities investigated, but is dependent on both sleep stages and time of night.

Cerebral Cortex↗
PubMed1991

[Neonatal mortality and morbidity of low birth weight premature infants (less than or equal to 1500 g)].

Neonatal mortality and morbidity were reported over a 4-yr period from 1986-1989 in premature infants weighing less than 1,500 g, 278 of whom were born in the same obstetrico-neonatal unit. Total mortality was 15%, and was higher in premature infants weighing less than 1,000 g (38%) and lower if the gestational age was greater than 27 wk. Mortality was lower in small for gestational age (SGA) infants than in appropriate for gestational age (AGA) infants (5% vs 19%, P less than 0.001), and lower in inborn babies than in outborn (12% vs 19%, P less than 0.02) but only in neonates weighing less than 1,000 g. Neonatal morbidity was mainly due to hyaline membrane disease and cerebral haemorrhage. The incidence of broncho-pulmonary dysplasia was low (4%). These results indicate that gestational age, birth weight and place of delivery play a role in mortality and morbidity in very low birth weight premature infants.

France↗
PubMed1991

[Infants born to kidney transplant recipients].

Over a period of 24 years, 23 women who had undergone renal transplantation gave birth to 26 children whose gestational ages were above 28 weeks. The average duration of stable kidney function tests before the onset of pregnancy was 34.5 months (6 to 109 months). Immunosuppressive treatment consisted mostly of azathioprine and steroids (20/26), steroids and cyclosporin A (CyA) in one case, and azathioprine, steroids and CyA in 5 cases. Average gestational age at birth was 35.2 weeks (30-40 weeks), average birth weight was 2,330 g (1,160-3,700 g). Caesarean section was performed in 73% of cases. The most frequent neonatal pathological condition was the occurrence of respiratory distress, most often related to prematurity and the mode of delivery. No child presented with any lethal congenital malformation. Children born to mothers who were given CyA did not present with more congenital malformations or renal function impairment.

Adult↗
PubMed1990

Estimating resting energy expenditure by simple lean-body-mass indicators in children on total parenteral nutrition.

The aim of this study was to determine simple predictive factors of the resting energy expenditure (REE) in children. Two groups, A (n = 14) and B (n = 23), were defined by their weight-for-height index, less than 90% and greater than 90%, respectively. Anthropometrically assessed lean body mass (LBM), 24-h urinary creatinine, and REE were measured. From multiple-regression analysis, the best-fitting equation for calculating REE (REE = 54.4 LBM (kg) + 0.095 creatinine (mmol/kg) + 4.7) was highly significant (r = 0.987, p less than 0.0001). Although the regressions of REE on weight were significantly different between the two groups, the equations using LBM or 24-h urinary creatinine did not discriminate between them. These findings suggest that an equation based on LBM or 24-h urinary creatinine excretion could be a more accurate estimate of REE than are conventional methods based on weight or height, and it may be applicable to diverse nutritional states.

Basal Metabolism↗
PubMed1990

Whole body protein turnover measured with 13C-leucine and energy expenditure in preterm infants.

Our study was undertaken in preterm infants to examine the relationship of whole body protein kinetics with protein intake and energy expenditure. Leucine kinetics were determined in seven low birth wt preterm infants fed human milk or human milk enriched with protein (2.5 to 4.3 g protein/kg.d). The infants received a short (4-h) constant infusion of L-[1-13C]leucine and leucine turnover and oxidation were calculated from 13C-plasma leucine and expired 13CO2 enrichments measured by mass spectrometry. Energy expenditure was measured by indirect calorimetry. Nonoxidative leucine disposal (an estimate of protein synthesis) and leucine derived from protein (an estimate of protein breakdown) were, respectively, 2.98 +/- 0.82 and 2.06 +/- 0.74 mumol/kg.min. Whole body protein turnover and deposition, derived from leucine kinetics, were 8.22 +/- 2.31 and 2.17 +/- 0.50 g/kg.d, whereas energy expenditure was 56.3 kcal/kg.day. Protein turnover was correlated with protein intake but not with protein deposition. Energy expenditure was correlated with protein turnover, synthesis, and breakdown but not with protein deposition. These data are in agreement with the fact that protein deposition depends upon protein intake, but they also suggest that an elevated protein deposition is not necessarily the result of a rapid protein turnover or associated with an elevated energy expenditure.

Carbon Isotopes↗