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.
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

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

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.
References in periodicals archive ?
Fourth, there is some evidence for supplementation of very low birth weight infants with vitamin A, vitamin D, calcium and phosphorus starting as soon as feeding is established, and for all low birth weight infants with iron starting after 8 wk of age.
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.
6, respectively), more than twice the odds of bearing a very low birth weight infant (2.
Low birth weight was defined as infants weighing between 1,500 and 2,500 g at birth, and very low birth weight was defined as infants weighing < 1,500 g.
In our study the percentage of respiratory disease attributable to moderately or very low birth weight was estimated to be 1.
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.
Thus, Vivette D'Agati, MD, of the Columbia University College of Physicians and Surgeons in New York City, NY, and her colleagues studied six patients (two women and four men) who had clinical indications of this condition and who were born prematurely and of a very low birth weight.
1) Among infants born there in 1995, those whose mothers had a diagnosed psychiatric or substance-related disorder had roughly 2-4 times the odds of other babies of having a low or very low birth weight, and of being delivered preterm.
Among women receiving combination therapy, however, users of protease inhibitors may be more likely than nonusers to have a very low birth weight infant (odds ratio, 3.
1) The increased prevalence of low or very low birth weight among babies conceived using procedures in which eggs and sperm are handled outside the body (including embryo transfer) can be partially explained by the relatively high proportion of multiple births resulting from these procedures.

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