Antenatal Corticosteroids Increase Fetal, But Not Postnatal, Pulmonary Blood Flow in Sheep

Antenatal Corticosteroids Increase Fetal, But Not Postnatal, Pulmonary Blood Flow in Sheep
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产前皮质类固醇会增加绵羊胎儿的肺血流量,但不会增加产后的肺血流量

DOI:
10.1203/pdr.0b013e3181b1bc5d
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发表时间:
2009
期刊:
影响因子:
3.6
通讯作者:
S. Hooper
S. Hooper
中科院分区:
医学3区
文献类型:
--
作者:
K. Crossley;C. Morley;B. Allison;P. Davis;G. Polglase;M. Wallace;V. Zahra;S. Hooper

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早产儿的肺具有不成熟的呼吸道和气体交换结构,通常缺乏表面活性物质。糖皮质激素通常用于促进早产儿胎肺成熟,但其对出生前和出生后即刻肺血流量(PBF)的影响知之甚少。我们的目的是确定产前倍他米松对极早产羔羊出生前和出生后过渡期间PBF的影响。产前应用倍他米松后30h胎儿平均PBF由20.2±5.1升至84.3±18.3mL/min,PBF波形也发生明显改变。首次应用倍他米松36h后,平均舒张期血流量由−38.5±4.9升至−10.2±11.0m L/m in(负值表示逆行离肺)。在产后10min内,对照羔羊和倍他米松处理羔羊的PBF相似。结果表明,产前应用倍他米松可显着增加胎儿PBF,改变PBF波形,但对出生后PBF影响不大。
The lungs of very preterm infants have immature airways and gas exchange structures and are usually surfactant deficient. Antenatal corticosteroids are commonly used to enhance fetal lung maturation in preterm infants, but little is known of their effects on pulmonary blood flow (PBF) before and immediately after birth. Our aim was to determine the effects of antenatal betamethasone on PBF before birth and during the postnatal transition in very preterm lambs. Antenatal betamethasone treatment significantly increased mean fetal PBF from 20.2 ± 5.1 to 84.3 ± 18.3 mL/min at 30 h after administration; the PBF waveform was also significantly altered. Mean diastolic PBF increased from −38.5 ± 4.9 pretreatment to −10.2 ± 11.0 mL/min at ∼36 h after the initial betamethasone dose (negative values indicate retrograde flow away from the lungs). Within 10 min after delivery, PBF was similar in control and betamethasone-treated lambs. These data demonstrate that antenatal betamethasone significantly increases fetal PBF and alters the PBF waveform but has little effect on postnatal PBF.
母体给予糖皮质激素和促甲状腺素释放激素可促进未受干扰的早产羔羊的胎肺成熟。
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发表时间: 1994
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发表时间: 1996
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