活产双胎低出生体重儿影响因素分析

目的探讨活产双胎低出生体重与相关因素关系。方法将657对活产双胎按出生体重分为体重均低组、单低体重组和体重正常组,配对分析双胎性别、出生次序与低出生体重的关系;分析母亲因素（孕龄、孕周、孕次、产次、血压、血红蛋白等）与出生体重的关系。结果双胎中第2个出生胎儿为低体重者明显多于第1个出生胎儿,女婴显著多于男婴。各体重组母亲孕周、产次比较差异有统计学意义;低体重组母亲孕初舒张压显著低于正常组,血红蛋白值始终高于体重正常组。结论双胎低出生体重与胎儿性别、出生顺序、母亲孕周、产次有关。双胎母亲孕期血压、血红蛋白与胎儿低出生体重间的关系是否属于对双胎妊娠的一种适应,有待进一步探讨。

Corelative factors of low birthweight in 657 livebirth pairs of twins

Objective To investigate the correlative factors of low birthweight in twin pregnancies.Methods The sample consisted of 657 livebirth pairs of twins was grouped into three categories:both-twins with low-birthweight,one-twin with low-birthweight and both-twins with normal birthweight.To analyze the relation of low birthweight with gender and birth order within pairs.To compare the maternal factors among the 3 group including age of maters,gestational age,gravida,parity,blood pressure and hemoglobin(Hb).Results There were more low-bithweight fetuses in 2nd twins,or in female ones.The maternal gestational age and parity were significantly different among the 3 groups.In the low-birthweight groups,the diastolic blood pressure was lower than that of the normal group in early pregnant period,and the maternal Hb was higher all the time.Conclusion The gender,birth order,gestation age,and parity are the correlative factors of low birthweight in twins.At pregnant period,the relation for maternal Hb and diastolic blood pressure with low birthweight of twins may be a "maternal adaptation" to twin pregnancy,but need more research.