very low birth weight


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weight

 [wāt]
1. heaviness; the degree to which a body is drawn toward the earth by gravity. (See also Tables of Weights and Measures in the Appendix.) Abbreviated wt.
2. in statistics, the process of assigning greater importance to some observations than to others, or a mathematical factor used to apply such a process.
apothecaries' weight see apothecaries' system.
atomic weight the sum of the masses of the constituents of an atom, expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000. Abbreviated At wt.
avoirdupois weight see avoirdupois system.
equivalent weight the amount of substance that combines with or displaces 8.0 g of oxygen (or 1.008 g of hydrogen), usually expressed in grams; for acid/base reactions, one equivalent donates or receives a mole of protons and the equivalent weight is the ratio of the molecular weight to the number of protons involved in the reaction. For oxidation-reduction reactions, one equivalent donates or receives a mole of electrons and the equivalent weight is the ratio of the molecular weight to the number of electrons involved in the reaction.
gram molecular weight the molecular weight of a substance expressed in grams; one gram molecular weight of a molecular substance contains one mole of molecules. See also mole1.
low birth weight (LBW) see under infant.
molecular weight the weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW. Although widely used, the term is not technically correct; relative molecular mass is preferable.
very low birth weight (VLBW) see under infant.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Referring to an infant weighing 1.0 to 1.5 kg at birth, who is at high risk for poor development, neurobehavioral dysfunction, and poor school performance
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

very low birth weight

VLBW Neonatology Referring to an infant weighing between 1000 g and 1500 g at birth; these children are at high risk for neurobehavioral dysfunction, poor school performance. See Low birth weight. Cf Extremely low birth weight.
Very Low Birth Weight infants–outcomes
Birthweight  ≤ 750 g  750-1.5 g  ≥ 1.5 Kg
Sample number  68 65 61
MPC score*  87 93 100
Mental retardation (IQ < 70) 21% 8% 2%
Poor cognitive function 22% 9% 2%
Poor academic skills 27% 9% 2%
Poor gross motor function  27% 9% 0%
Poor adaptive function  25% 14% 2%
Cerebral palsy 9% 6% 0%
Severe visual disability 25% 5% 2%
Hearing disability  24% 13% 3%
↓ Weight/height/head size 22/25/35% 11/5/14% 0/0/2%%
*Mental Processing Composite score
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ver·y low birth weight

(VLBW) (ver'ē lō bĭrth wāt)
Infant weighing less than 1500 g at birth. Can be due to a range of factors including interference with intrauterine growth or premature birth.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Human milk feedings and infection among very low birth weight infants.
Vitamin A supplementation for preventing morbidity and mortality in very low birth weight infants.
Table 2 shows the results of the multiple logistic regression analysis for stillbirths and low and very low birth weight for each water region after adjusting for potential confounders.
The ORs associated with TTHM exposure showed statistically significant heterogeneity between water regions, for both low and very low birth weight but not for stillbirths (Table 2, notes).
"In our study the percentage of respiratory disease attributable to moderately or very low birth weight was estimated to be 1.8 percent.
Compared with women reporting no partner violence, those reporting any had nearly twice the odds of having a low-birth-weight baby or preterm delivery (odds ratios, 1.7 and 1.6, respectively), more than twice the odds of bearing a very low birth weight infant (2.5) and more than three times the odds of having a baby who was very preterm or who died a short time after birth (3.7 and 3.5).
Several variables that were predictors of low birth weight remain strong risk factors for very low birth weight, including African-American race of the mother (OR = 1.60; 95% CI, 1.48-1.74), maternal height < 61 inches (OR = 1.59; 95% CI, 1.746-1.72), maternal weight < 110 lbs (OR = 1.39; 95% CI, 1.28-1.51), maternal smoking (OR = 1.25; 95% CI, 1.15-1.35), and female sex of the baby (OR = 1.22; 95% CI, 1.15-1.30).
Washington, Nov 20 (ANI): Babies with very low birth weights are at an increased risk of developing chronic renal disease, called segmental glomerulosclerosis, in future, according to a new study.
This was explained by a lower neonatal death rate among Asian Indian infants who had a low or very low birth weight, which compensated for the larger proportion of infants born at these weights.
Similarly, whereas 5% of women with no diagnosis bore an infant who was low-birth-weight (less than 2,500 g), the proportion was 10-18% among those with a diagnosis; for very low birth weight (less than 1,500 g), the proportion was 1% for those with no documented disorder and 3% for women with a psychiatric or substance-related disorder or both.
The researchers studied the women's characteristics and type of antiretroviral therapy used, as well as the following outcomes for singleton births: premature and very premature delivery (at less than 37 and 32 weeks' gestation, respectively), low and very low birth weight (less than 2,500 g and 1,500 g, respectively), possibly and definitely abnormal Apgar scores (less than seven and four, respectively) at one minute and five minutes, and stillbirth.
They identified 42,463 infants born alive who were conceived through a total of 136,972 ART procedures, and they analyzed the prevalence of low birth weight (2,500 g or less) and very low birth weight (less than 1,500 g), as well as factors such as the woman's age, number of previous births, type of ART used, whether ART had been used before and cause of infertility.

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