1. Al-Aweel I, Pursley DM, Rubin LP, Shah B, Weisberger S, Richardson DK . Variations in prevalence of hypotension, hypertension, and vasopressor use in NICUs. J Perinatol 2001; 21: 272–278.
2. Dasgupta SJ, Gill AB . Hypotension in the very low birthweight infant: the old, the new, and the uncertain. Arch Dis Child Fetal Neonat Ed 2003; 88: F450–F454.
3. Spinazzola RM, Harper RG, de Soler M, Lesser M . Blood pressure values in 500- to 750-gram birthweight infants in the first week of life. J Perinatol 1991; 11: 147–151.
4. Moise AA, Wearden ME, Kozinetz CA, Gest AL, Welty SE, Hansen TN . Antenatal steroids are associated with less need for blood pressure support in extremely premature infants. Pediatrics 1995; 95: 845–850.
5. Zubrow AB, Hulman S, Kushner H, Falkner B . Determinants of blood pressure in infants admitted to neonatal intensive care units: a prospective multicenter study. J Perinatol 1995; 15: 470–479.