Chiswick M L, Milner R D
Arch Dis Child. 1976 Jan;51(1):22-7. doi: 10.1136/adc.51.1.22.
Serial measurements of crying vital capacity (CVC), expressed as ml/cm chest circumference, were made by reverse plethysmography during the first 2 weeks of life. Clinically normal babies born at term by elective caesarean section had a smaller mean CVC in the first 2 weeks of life compared with clinically normal term babies born vaginally. In contrast, no significant difference was shown between the mean CVC in term babies born vaginally and those born by urgent caesarean section. Clinically normal term babies born by caesarean section (elective and urgent) had a smaller mean percentage rise of CVC in the first 24 hours of life and a significant delayed rise of CVC from 24-48 hours compared with those born vaginally. Clinically normal preterm babies born vaginally had a smaller mean CVC in the first 2 weeks of life compared with term babies born vaginally, and were characterized by a significant rise of CVC from 5-10 days. Babies with hyaline membrane disease (HMD) had a smaller CVC in the first 2 weeks of life compared with clinically normal preterm babies. Babies of various gestational ages with transient tachypnoea (TT) had a smaller mean CVC in the first 2 weeks of life compared with clinically normal term babies, but a similar mean CVC in the first 72 hours of life compared with clinically normal preterm babies. At each postnatal age the mean CVC of babies with HMD was less than the corresponding mean in babies with TT. All babies with TT had a rise in CVC from 24-48 hours, whereas CVC fell in all babies with HMD except one during this period. CVC is a simple, safe, rapid, and noninvasive test of neonatal lung function, and is a valuable aid to other methods of assessing pulmonary function in the neonate with respiratory distress.
在出生后的前2周，通过逆向体积描记法对以毫升/厘米胸围表示的哭声肺活量（CVC）进行连续测量。与经阴道分娩的足月临床正常婴儿相比，择期剖宫产出生的足月临床正常婴儿在出生后的前2周平均CVC较小。相比之下，经阴道分娩的足月婴儿与急诊剖宫产出生的足月婴儿的平均CVC之间没有显著差异。与经阴道分娩的婴儿相比，剖宫产（择期和急诊）出生的足月临床正常婴儿在出生后的前24小时内CVC的平均百分比升高较小，并且从24至48小时CVC的升高明显延迟。与经阴道分娩的足月婴儿相比，经阴道分娩的临床正常早产儿在出生后的前2周平均CVC较小，其特点是在5至10天时CVC显著升高。与临床正常早产儿相比，患有透明膜病（HMD）的婴儿在出生后的前2周CVC较小。患有短暂性呼吸急促（TT）的不同胎龄婴儿在出生后的前2周平均CVC比临床正常足月婴儿小，但在出生后的前72小时内平均CVC与临床正常早产儿相似。在每个出生后年龄，患有HMD的婴儿的平均CVC低于患有TT的婴儿的相应平均值。所有患有TT的婴儿在24至48小时CVC都有所升高，而在此期间，除了一名婴儿外，所有患有HMD的婴儿的CVC都下降了。CVC是一种简单、安全、快速且无创的新生儿肺功能检测方法，对于评估有呼吸窘迫的新生儿的肺功能的其他方法而言是一种有价值的辅助手段。
