| Normal Predicted Value of Airway Resistance by Flow Interrupter Technique in Korean Primary School-Aged Children |
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Byong Kwan Son, Dae Hyun Lim, Jeong Hee Kim, Jong Woon Choi, Soon Ki Kim, Sei Woo Chung |
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Department of Pediatrics, Inha University Hospital, College of Medicine, Inha University, Incheon, Korea |
| 기류 차단 방법을 이용한 초등학교 아동의 기도 저항 예측치에 관한 연구 |
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손병관, 임대현, 김정희, 최종운, 김순기, 정세우 |
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인하대학교 의과대학 소아과학교실 |
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| Abstract |
Purpose
: To get the normal predicted value of airway resistance in Korean primary school-aged
children by using flow interrupter technique which is simple and easy enough to be applicable even
to young children.
Methods
: Among all the children of one primary school, we selected 964 (Male 469, Female 495).
Excluded children were out of normal range in growth with Korean standard and/or history and/or
symptom and sign of airway diseases. One medical doctor, well trained to the Microlab 4000
(Micromedical Co. England) educated the children before check and carried out all the procedure. Rint
(Airway resistnace by interrupter technique) was checked 5 times. After exclusion of both highest and
lowest values, we got the average of remaining 3 values as Rint (in both inspiratory and expiratory
phases). We got mean, standard deviation, regression equation, correlation coefficient in every age,
height group, weight group, and chest circumference group in both sex.
Results
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1) Age ranged from 6 to 11 years. 6-year-old boys' Rint were 0.56±0.15 kPaㆍl-1ㆍs and 0.56±0.15
kPaㆍl-1ㆍs in inspiratory and expiratory phase, respectively. They were 0.55±0.16 kPaㆍl-1ㆍs and
0.55±0.18 kPaㆍl-1ㆍs in girls. The Rint decreased as the children getting older.
2) Height ranged from 105 to 160 cm. Rint of boys from 111 to 115 cm in height were 0.54±0.11
kPaㆍl-1ㆍs and 0.55±0.15 kPaㆍl-1ㆍs in inspiratory and expiratory phase, respectively. They were
0.56±0.18 kPaㆍl-1ㆍs and 0.56±0.19 kPaㆍl-1ㆍs in girls. The Rint decreased as the children getting
taller.
3) Weight ranged from 16 to 57 kg. Rint of boys from 16 to 18 kg in weight were 0.52±0.07
kPaㆍl-1ㆍs and 0.59±0.07 kPaㆍl-1ㆍs in inspiratory and expiratory phase, respectively. They were
0.47±0.15 kPaㆍl-1ㆍs and 0.43±0.14 kPaㆍl-1ㆍs in girls. The Rint decreased as the children getting
heavier.
4) Chest circumference ranged from 50 to 85 cm. Rint of boys from 50 to 55 cm in chest
circumference were 0.49±0.12 kPaㆍl-1ㆍs and 0.46±0.13 kPaㆍl-1ㆍs in inspiratory and expiratory
phase, respectively. They were 0.53±0.16 kPaㆍl-1ㆍs and 0.52±0.17 kPaㆍl-1ㆍs in girls. The Rint
decreased as the children's chest circumference increase.
5) We got regression equations and correlation coefficient by age, height, weight, and chest
circumference in both boys and girls and in both inspiratory and expiratory phases. Correlation was
best with height but correlation coefficient was less than 0.45
Conclusion
: We got the normal predicted value of airway resistance by flow interrupter technique.
It can be used in evaluating lung condition, progression of lung disease, and effectiveness of drugs
in lung disease. |
| Key Words:
Pulmonary function test, Normal predicted value, Airway resistance, Flow interrupter technique |
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