O'Shea J, Lapp N L, Russakoff A D, Reger R, Morgan W K
Thorax. 1970 Sep;25(5):544-9. doi: 10.1136/thx.25.5.544.
The results obtained from two radiological methods of determining total lung capacity (TLC) (Kovach's parabo oid and Barnhard's ellipsoid) were compared with those obtained with the body plethysmograph. Determinations of TLC were made in four groups of subjects: group 1 consisted of 26 miners most of whom had simple pneumoconiosis; group 2 consisted of 12 normal subjects; group 3 consisted of eight subjects who had a variety of chest disease, but with no demonstrable parenchymal or pleural opacification; and group 4 consisted of 19 subjects with miscellaneous diseases, all showing demonstrable infiltration or opacification. The values obtained by the method of Kovach and his colleagues often differed markedly from the plethysmographic determinations, and it became apparent that this method was not sufficiently accurate. On the other hand, the technique of Barnhard and his colleagues gave results that were essentially similar to, and as far as we can say interchangeable with, those obtained by the body plethysmograph in groups 1, 2, and 3. In subjects with marked pulmonary opacification or infiltration, the disparity between Barnhard's method and the plethysmograph tended to be more sizeable. It was concluded that Barnhard's method for determining total lung capacity is accurate and could be applied to epidemiological surveys.
将两种测定肺总量（TLC）的放射学方法（科瓦奇抛物线法和巴纳德椭圆法）所得结果与体容积描记法所得结果进行了比较。对四组受试者进行了TLC测定：第1组由26名矿工组成，其中大多数患有单纯尘肺；第2组由12名正常受试者组成；第3组由8名患有各种胸部疾病但无明显实质性或胸膜混浊的受试者组成；第4组由19名患有各种疾病且均有明显浸润或混浊的受试者组成。科瓦奇及其同事的方法所得值往往与容积描记法测定值有显著差异，显然该方法不够准确。另一方面，巴纳德及其同事的技术所得结果与体容积描记法在第1、2和3组中所得结果基本相似，就我们所能说的而言是可互换的。在有明显肺部混浊或浸润的受试者中，巴纳德法与容积描记法之间的差异往往更大。得出的结论是，巴纳德测定肺总量的方法准确，可应用于流行病学调查。
