Influence of Adopting New Vital Capacity Estimation Formula and Amended %VC Evaluation Grades

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  • 肺活量予測式および%肺活量判定区分変更による影響
  • ハイカツリョウ ヨソクシキ オヨビ %ハイカツリョウ ハンテイ クブン ヘンコウ ニ ヨル エイキョウ

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Abstract

Objective: To compare the results of estimating %vital capacity (%VC) using a new formula and the %VC judgment grades in the 2008 revision (new standard) with estimation by formula of Baldwin's formula for this purpose and the 2002 judgment grades (former standard) in testing pulmonary function. <br>Methods: In a total of 118,733 persons undergoing pulmonary function tests, %VC was calculated by the new and former standards, and evaluation grades assigned according to them. In addition, temporal changes in vital capacity for subjects with restrictive ventilatory impairment who underwent repeated testing were examined according to the new standard. <br>Results: Incidence of less than 80% vital capacity (restrictive ventilatory impairment) was 7.5% by the former standard and 28.8% by the new standard. By the former standard, rates for the evaluation grades of A: no abnormality, C: follow-up required and D; treatment required were 92.5%, 7.2% and 0.3%, respectively. By the new standard, in which there is no Grade C, rates were 71.2% for grade A, and 28.8% for grade D. Furthermore, in a detailed examination of restrictive ventilatory impairment by the new standard, %VC ranged from 70 - 79% in 81.8% of cases, 60 - 69% in 15.8% and less than 60% in 3.1%. In subjects undergoing repeated testing, for those with a %VC in the range 70 - 79% in the initial test, the results of the final test showed an increase in %VC for 70.6% and a decrease for 28.7%. In subjects in whom the decrease occurred over 3 years or more, the average annual change in vital capacity was -0.78±0.89 percentage points.<br>Conclusion: According to the new standard, while there was a 3.8-fold increase in the number of subjects with restrictive ventilatory impairment, 80% of them were in the 70 - 79% %VC range and at about -0.8 percentage points per year, the average annual decrease in %VC was small, so such subjects could be the target of follow-up.

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