triiodothyronine--reverse and Birth-Weight

triiodothyronine--reverse has been researched along with Birth-Weight* in 6 studies

Other Studies

6 other study(ies) available for triiodothyronine--reverse and Birth-Weight

ArticleYear
Thyroid function in preterm infants 27-29 weeks of gestational age during the first four months of life: results from a prospective study comprising 80 preterm infants.
    Journal of pediatric endocrinology & metabolism : JPEM, 2007, Volume: 20, Issue:12

    Assessment of thyroid function in preterm neonates (PTN) 27-29 weeks of gestational age.. 80 PTN, gestational age 27 weeks in 24, 28 weeks in 28, and 29 weeks in 28. Neonates were classified as healthy (n=17) or sick (n=63). Measurement of serum TSH, free T4, T4, T3 and rT3 in the mother and in the cord at the time of delivery, and in the infant at 1 hour, 24 hours, 1 week, 3 weeks, and 2 and 4 months of postnatal age.. In healthy and sick preterms, TSH values peaked at 1 hour and decreased thereafter. Healthy PTN presented a peak in free T4 values at 24 hours that was not observed in sick neonates. Sick PTN had a lower TSH peak and lower free T4 values at 24 hours and 1 week than healthy ones (p < 0.05). Healthy PTN 27-29 weeks had lower TSH peak at 1 hour and lower free T4, T3 and T4 values during the first 2 months than healthy PTN 30-35 weeks (PTN30-35w) previously evaluated (p < 0.05). However, at all postnatal times healthy preterms had free T4 values above -2 SD of the mean values of healthy PTN30-35w. A wide range of free T4 values was observed in the sick group. Free T4 values above -2 SD of the mean values of healthy PTN30-35w were detected in a high proportion of sick PTN (58.3% at 24 hours, 73.5% at 1 week, 93.9% at 3 weeks, 85.1% at 2 months and 100% at 4 months).. Prematurity and disease influence thyroid function, and consequently thyroid function should be individually assessed in preterms 27-29 weeks of gestation during the first 2 months of life.

    Topics: Birth Weight; Databases, Factual; Gestational Age; Humans; Infant, Newborn; Infant, Newborn, Diseases; Infant, Premature; Longitudinal Studies; Neonatal Screening; Prospective Studies; Spain; Thyroid Function Tests; Thyroid Gland; Thyrotropin; Thyroxine; Time Factors; Triiodothyronine; Triiodothyronine, Reverse

2007
Unusual features of neonatal thyroid function in small-for-gestational-age lambs. Origin of plasma T4 and T3 deficiencies.
    Journal of developmental physiology, 1990, Volume: 14, Issue:1

    Thyroid function was studied in small for gestational age (SGA) or control newborn lambs. Neonatal changes in plasma concentrations of TSH, T3, rT3, total and free T4 were monitored, and thyroid scintigraphs were performed. Responsiveness of the hypothalamic-pituitary-thyroid axis to cold exposure and TRH or TSH administration was assessed. In addition, T4 and T3 kinetic studies were performed. In agreement with results obtained in babies, plasma T3, total T4 and free T4 concentrations were depressed in low birth weight animals, whereas TSH and rT3 levels were not affected. Thyroid size expressed relatively to the body weight was higher in SGA animals, thus suggesting that a partial compensation for low thyroid hormone levels had occurred during the fetal life. Plasma TSH and T4 concentrations increased by a same extent after exposure to cold and TRH or TSH administration in SGA and control lambs; however, the rise in T3 levels was depressed in the former in all stimulation tests. T3 and T4 production rates were similar in the two experimental groups. In SGA lambs, the metabolic clearance rate and the total distribution space of these two hormones were significantly increased; the fast T3 pool was higher, and the slow T3 pool lower than in control animals. All these results demonstrate that, despite low circulating thyroid hormone concentrations, SGA lambs are not hypothyroid. An increased T4 and T3 storage in the extravascular compartment is probably the major factor involved in the occurrence of this plasma deficiency.(ABSTRACT TRUNCATED AT 250 WORDS)

    Topics: Animals; Animals, Newborn; Birth Weight; Cold Temperature; Fetal Growth Retardation; Kinetics; Radionuclide Imaging; Sheep; Thyroid Gland; Thyrotropin; Thyrotropin-Releasing Hormone; Thyroxine; Triiodothyronine; Triiodothyronine, Reverse

1990
Neonatal changes in plasma cortisol, free and total iodothyronine levels in control and hypotrophic lambs.
    Reproduction, nutrition, developpement, 1987, Volume: 27, Issue:5

    Neonatal changes in plasma free and total iodothyronines, cortisol, glucose and urea levels have been studied in 8 control (birthweight greater than or equal to 2.5 kg) and 16 hypotrophic lambs (birthweight less than 2.5 kg) receiving limited amounts of colostrum during the first 36 h of life and then fed ad libitum. During the period of colostrum feeding, plasma glucose levels were low in both groups and increased after the onset of ad libitum feeding; they were significantly lower in hypotrophic animals from birth to 36 h. Plasma urea levels increased during the period of colostrum feeding and decreased thereafter in all animals. At birth, they were significantly higher in hypotrophic lambs. Over the entire period studied (20 d), plasma levels of total T4, free T4, total T3 and free T3 were markedly lowered in hypotrophic lambs without alterations in the values of the T3/free T4 ratio. No differences could be observed in plasma reverse T3 and cortisol levels. For all blood parameters recorded, the neonatal changes were parallel in the two groups of lambs. In agreement with hypoglycemia and hyperuremia observed at birth in hypotrophic lambs, with the litter size recorded for each experimental group and with previous results, placental insufficiency linked to a large litter size gestation could be at the origin of low thyroid hormone levels.

    Topics: Animals; Animals, Newborn; Birth Weight; Blood Glucose; Hydrocortisone; Sheep; Thyroid Hormones; Thyroxine; Triiodothyronine; Triiodothyronine, Reverse; Urea

1987
Growth hormone deficiency: analysis of 49 patients.
    Acta paediatrica Academiae Scientiarum Hungaricae, 1981, Volume: 22, Issue:1-2

    In a survey of 49 children idiopathic growth hormone deficiency, a sex ratio of 3 : 2 was found. Multiple pituitary hormone deficiency (MPHD) was seen in 31 and isolated growth hormone deficiency (IGHD) in 18 cases. The incidence of breech delivery was 32.5%; it occurred more frequently in MPHD than in IGHD. In one family there were two affected brothers whose birth weight was 4800 and 4900 g, respectively, and who were extremely retarded in growth. Screening of 594 children 1 to 9 years of age with cleft lip and palate was carried out; 1 child with growth hormone deficiency was detected. A study of the value of different thyroid hormones in the diagnosis of secondary and tertiary hypothyroidism showed that in spite of low free thyroxin concentrations the thyroxine and triiodothyronine levels are often normal. The discrepancy is probably due to a significantly higher plasma level of thyroxine-binding globulin demonstrated in children with hypopituitarism.

    Topics: Adolescent; Birth Weight; Child; Child, Preschool; Cleft Lip; Cleft Palate; Delivery, Obstetric; Female; Growth Hormone; Humans; Hypothyroidism; Infant; Infant, Newborn; Male; Thyroid Function Tests; Thyrotropin; Thyroxine; Thyroxine-Binding Proteins; Triiodothyronine; Triiodothyronine, Reverse

1981
Thyroid hormone and thyrotropin responses to parturition in premature infants with and without the respiratory distress syndrome.
    Pediatrics, 1979, Volume: 63, Issue:3

    Topics: Birth Weight; Gestational Age; Humans; Infant, Newborn; Respiratory Distress Syndrome, Newborn; Thyroid Hormones; Thyrotropin; Thyroxine; Thyroxine-Binding Proteins; Triiodothyronine, Reverse

1979
Cord blood reverse T3 in normal, premature, euthyroid low T4, and hypothyroid newborns.
    Journal of endocrinological investigation, 1978, Volume: 1, Issue:1

    Topics: Birth Weight; Female; Fetal Blood; Gestational Age; Humans; Hypothyroidism; Infant, Newborn; Infant, Premature; Male; Thyrotropin; Thyroxine; Triiodothyronine; Triiodothyronine, Reverse

1978
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