Growth Dynamics of Low-Birth-Weight Infants with Emphasis on the Perinatal Period

Brandt, Ingeborg

doi:10.1007/978-1-4613-2101-9_21

Cited by 52 publications

(21 citation statements)

References 135 publications

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“…Figure 6 illustrates the growth dynamics for all the birth weight categories of adequate-for-gestational-age preterm newborns, showing that weight gain velocity, when expressed as g kg -1 day -1 , is inversely proportional to birth weight. There was a clear trend for lower birth weight infants to approximate and reach the weight of larger newborns, in agreement with literature data (20)(21)(22).…”

Section: Resultssupporting

confidence: 91%

“…It is clear that the highest birth weight group (curve 7), which was also the group of neonates that lost less weight (5.9%), had the lowest relative weight gain peak (11.5 g kg -1 day -1 ). Certainly, due to their birth weight, gestational age and clinical progression, their growth dynamics was closer to that of term infants (20). Yet, on the 12th week, there was a converging movement of all curves, with weight gain ranging from 10.2 g kg -1 day -1 to 7.5 g kg -1 day -1 in the lower or higher weight categories, respectively, and low birth weight infants tended to get closer to and achieve the weight of larger infants, as also reported in the literature (20)(21)(22).…”

Section: Discussionmentioning

confidence: 99%

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Weight of preterm newborns during the first twelve weeks of life

Anchieta

Xavier

Colosimo

et al. 2003

Braz J Med Biol Res

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A longitudinal and prospective study was carried out at two stateoperated maternity hospitals in Belo Horizonte during 1996 in order to assess the weight of preterm appropriate-for-gestational-age newborns during the first twelve weeks of life. Two hundred and sixty appropriate-for-gestational-age preterm infants with birth weight <2500 g were evaluated weekly. The infants were divided into groups based on birth weight at 250-g intervals. Using weight means, somatic growth curves were constructed and adjusted to Count's model. Absolute (g/day) and relative (g kg -1 day -1 ) velocity curves were obtained from a derivative of this model. The growth curve was characterized by weight loss during the 1st week (4-6 days) ranging from 5.9 to 13.3% (the greater the percentage, the lower the birth weight), recovery of birth weight within 17 and 21 days, and increasingly higher rates of weight gain after the 3rd week. These rates were proportional to birth weight when expressed as g/day (the lowest and the highest birth weight neonates gained 15.9 and 30.1 g/day, respectively). However, if expressed as g kg -1 day -1 , the rates were inversely proportional to birth weight (during the 3rd week, the lowest and the highest weight newborns gained 18.0 and 11.5 g kg -1 day -1 , respectively). During the 12th week the rates were similar for all groups (7.5 to 10.2 g kg -1 day -1 ). The relative velocity accurately reflects weight gain of preterm infants who are appropriate for gestational age and, in the present study, it was inversely proportional to birth weight, with a peak during the 3rd week of life, and a homogeneous behavior during the 12th week for all weight groups.

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Section: Resultssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Weight of preterm newborns during the first twelve weeks of life

Anchieta

Xavier

Colosimo

et al. 2003

Braz J Med Biol Res

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“…From the sixth week onwards, there is a deceleration in rates of weight increase, with the values of these rates drawing together at the end of the study (12th week), probably translating into smaller newborns, after a period of acceleration catching up and maintaining a growth rate similar to that of the larger ones. 6,[25][26][27] The analysis of the rate of head circumference increase, both in cm/week ( Figure 4) and in cm/m/week ( Figure 5) is very similar. In both the increase in head circumference is inversely proportional to birth weight, i.e.…”

Section: Discussionmentioning

confidence: 94%

“…With respect of head circumference growth velocity, there is an increase in head circumference velocity for the smaller newborn babies until a peak is reached, from which there is a gradual reduction Velocity (cm/m/week) Growth velocity of preterm newborns Anchieta LM et alii in velocity, although there are differences of opinion over the timing of this peak and whether it varies or not with gestational age. 25,28,29 For length, it is only with relative velocity (Figure 7) that it can be observed that length gain (cm/m/week) is inversely proportional to birth weight. The length rate curves 1, 2, 3 and 4 increase until the fourth and fifth weeks, and, after a period of constant values, begin to drop off, and at the end of the study these curves tend to run together.…”

Section: Discussionmentioning

confidence: 99%

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Velocidade de crescimento de recém-nascidos pré-termo adequados para a idade gestacional

Anchieta¹,

Xavier²,

Colosimo³

2004

J. Pediatr. (Rio J.)

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Objective: To assess the growth velocity of preterm appropriate-for-gestational-age newborns through growth curves.Method: A longitudinal and prospective study was carried out at two state-operated maternity hospitals in Belo Horizonte. Two hundred and sixty appropriate for gestational age preterm infants with birth weight < 2,500 g were evaluated weekly for body weight, head circumference and length. Growth velocity curves were constructed based on the derivative of the mathematical equation of the Count s model applied to somatic growth. Two analyses were made in the present study: absolute velocity, i.e., weight gain (g/day), and head circumference and length gains (cm/week); and relative velocity, i.e., weight gain (g/kg/day), and head circumference and length gains (cm/m/week).Results: The curves of weight gain (g/day) were proportional to birth weight (the lowest and the highest birth weight neonates gained 15.9 and 30.1 g/day, respectively). The curves of weight gain (g/kg/day) were inversely proportional to birth weight with increasingly higher rates of weight gain between the first and fourth weeks (during the third week, the lowest and the highest weight newborns gained 18 and 11.5 g/kg/day, respectively). Later there was a drop, and by the 12th week the rates were similar for all groups (7.5 to 10.2 g/kg/day). The curves of relative velocity (cm/m/week) for head circumference and length were inversely proportional to birth weight; the lower weight preterm newborns had, the higher head circumference and length growing rates were, compared with those with more weight. Conclusion:The relative velocity is the best parameter to describe the growth dynamics of preterm infants, especially of those with lower birth weight. Lower birth weight infants gained more weight, head circumference and length.

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