Extremely low-birth-weight (ELBW) infants

Weigh 401-1000 g at birth.

Extremely preterm infants less than 28 weeks gestational age born in the 1990s, 25% had a disability at preschool age, such as impaired mental development, cerebral palsy, blindness, or deafness.

Almost all extremely preterm infants of less than 28 weeks gestation experience intermittent hypoxemia and bradycardia during their stay in neonatal intensive units.

Many episodes of hypoxemia and bradycardia in extremely preterm infants are due to apnea of prematurity, but a significant number of such episodes occur in mechanically ventilated infants because of cardiorespiratory instability.

Infants born before 25 weeks gestation have impairment rates of greater than 50%.

Account for less than 1% of all births but one third of total infant mortality.

As many as 15% of these infants develop cerebral palsy and half develop impaired cognition and behavioral deficits.

Infections are frequent among such preterm infants and are associated with neurodevelopmental and growth impairments.


Extremely low-birthweight infants uniformly develop anemia of prematurity, caused by developmentally regulated physiological and non-physiological, iatrogenic, and mobility related factors.

Anemia may be associated with impaired oxygen supply to the brain and prematurity related brain injury in combination with apnea and intermittent hypoxemia with circulatory insufficiency during a period of rapid brain growth and development.

Red blood cell transfusion in such premature infants can have complications such as intraventricular hemorrhage, necrotizing enterocolitis, bronchopulmonary dysplasia, 
 retinopathy of prematurity and death.

Infants with an extremely low birth weight of less than 1000 g are at higher risk for anemia because of immaturity, impaired erythropoiesis, and frequent blood sampling.

In extremely low birth weight infants, a higher hemoglobin threshold for blood transfusion did not improve survival without neurodevelopmental impairment at 22-26 months of age.

Infants born extremely prematurely usually require respiratory support.

High-frequency oscillatory ventilation (HFOV) is a means to reduce the risk of bronchopulmonary dysplasia among neonates receiving ventilatory support.

HFOV uses a constant pressure applied to improve lung volume and oxygenation, while ventilation is achieved with the use of very low tidal volumes.

Initial randomized trials comparing HFOV with conventional ventilation showed a higher incidence of grade 3 or 4 intraventricular hemorrhage and periventricular leukomalacia.

Subsequent studies did not confirm these results: randomized trials subsequently resulted in significant but modest reductions in the risk of bronchopulmonary dysplasia, but overall did not show any advantage with respect to short-term outcomes including bronchopulmonary dysplasia.

Are monitored with pulse oximetry for several weeks after birth because of need for supplemental oxygen either intermittently or continuously.

Targeting oxygen saturations of 85% to 89% compared with 91% to 95% has no effects on rate of death or disability at 18 months(Schmidt B et al).

School-aged outcomes for these children are associated with very high rates of chronic health conditions and developmental problems compared with normal birth weight controls.

Associated with higher rates of chronic conditions, functional limitations and special health care needs compared with normal birth weight controls (Hack M et al).

The Extremely Preterm Infants Study in Sweden (EXPRESS) Associated with a infant survival rate of 70%, attributed to active perinatal care.

In the above study at 2 1/2 years 73% of children born with extreme prematurity had little or no disability, and neurodevelopmental outcomes improved with each week of gestational age (Serenius F et al).

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