All issues > Volume 45(7); 2002

Original Article

J Korean Pediatr Soc. 2002;45(7):828-835. Published online July 15, 2002.

Changes in the Outcomes of Very Low Birth Weight Infants

Shung Shin SS Kim¹, Moon Hee MH Kim², Jae Won JW Shin², Sun Young SY Ko², Eun Kyung EK Lee³, Yun Sil YS Chang², I Seok IS Kang², Won Soon WS Park², Mun Hyang MH Lee², Sang Il SI Lee², Heung Jae HJ Lee²

¹Department of Pediatrics, College of Medicine, Soonchunhyang University, Bucheon Hospital, Bucheon, Korea
²Department of Pediatrics, Samsung Medical Center, College of Medicine, Sungkyunkwan University, Seoul, Korea
³Department of Pediatrics, College of Medicine, Pocheon CHA University, Kangnam CHA General Hospital , Seoul, Korea

Correspondence Won Soon WS Park ,Email: wspark@smc.samsung.co.kr

Abstract

Purpose
: The outcomes of infants weighing less than 1,500 gm(very low birth weight infant : VLBWI) reflect recent progress in neonatal intensive care. In this study, we analyzed changes over time in survival rate and morbidity of VLBWIs during the past seven years.
Methods
: A retrospective review of medical records was analyzed for VLBWIs admitted to the neonatal intensive care unit of Samsung Medical Center within three days from birth. We compared the outcomes of previous corresponding data(period I : Oct. 1994 to Sept. 1996), with the outcomes of period II(Oct. 1996 to Dec. 1998) and period III(Jan. 1999 to Dec. 2000).
Results
: As shown in Tables 1 and 3, the distribution of birth weight, gestational age(GA), gender, and inborn admissions did not change during the 7-year study. The overall survival rate of VLBWI increased significantly over time(period I : 72% vs period III : 88.3%, P<0.05). Between period I and period II, the birth weight-specific survival rate increased by 23.6%(75% vs 92.7%, P<0.05) for infants 1,000 to 1,249 gm. Between period II and period III, the birth weight-specific survival rate increased three times(20% vs 66.7%, P<0.05) for infants <750 gm. The survivors of lowest birth weight included infants at 624 gm(GA : 26＋5 weeks), 667 gm(GA : 25＋6 weeks) and 480 gm(GA : 26＋2 weeks) in each period. The gestational age-specific survival rate in period III increased significantly in GA 25-26 weeks and 29-30 weeks(vs period I & period II, P<0.05). The survivors of lowest gestational age included infants at GA 26 weeks(970 gm), GA 23＋5 weeks(791 gm) and GA 24＋1 weeks(740 gm) in each period. The incidence of severe IVH(grade III, IV) and the early death rate(Conclusion
: The survival rate of VLBWI continues to increase, particularly for BW <750 gm, GA <26 weeks. This increase in survival is not associated by any increase in major morbidities.

Keywords :Very Low birth weight infant, Intensive care, Outcome