Dahlqvist M, Hedenstierna G
Clin Physiol. 1985 Apr;5(2):179-87. doi: 10.1111/j.1475-097x.1985.tb00594.x.
A comparison was made between the helium dilution technique and body plethysmography--using both mouth pressure and oesophageal pressure against box pressure--for measuring functional residual capacity (FRC). In patients with restrictive lung disease (n = 9) no major differences in FRC were noted between the techniques. In patients with obstructive lung disease (n = 17), helium dilution underestimated FRC by a mean of 0.9 l and conventional body plethysmography (mouth-box pressure) overestimated it by 0.4 l in comparison with FRC obtained by oesophageal pressure against box pressure. The difference between the techniques increased with increasing lung volumes. It is concluded that conventional body plethysmography measures FRC more accurately than the helium dilution technique in patients with obstructive lung disease.
对氦稀释技术和体容积描记法（使用口腔压力和食管压力相对于箱内压力）测量功能残气量（FRC）进行了比较。在限制性肺病患者（n = 9）中，两种技术测得的FRC无显著差异。在阻塞性肺病患者（n = 17）中，与通过食管压力相对于箱内压力测得的FRC相比，氦稀释法测得的FRC平均低估0.9升，传统体容积描记法（口腔-箱内压力）测得的FRC平均高估0.4升。两种技术之间的差异随肺容积增加而增大。得出结论：在阻塞性肺病患者中，传统体容积描记法比氦稀释技术更准确地测量FRC。
