Analysis of Breathing Pattern in Children with Asthma |
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| Authors: | Tetsuro Tanaka MD Tetsuya Shimazaki MD Isao Kusakawa MD Masaaki Ogihara MD Teruo Honda MD Masao Katayama MD Katsuyuki Miyasaka MD |
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| Institution: | Department of Pediatrics, Hachioji Medical Center, Tokyo Medical College, Tokyo;Department of Pediatrics, Tokyo Medical College, Tokyo;Pathophysiology Research Laboratory, National Children's Medical Research Center, Tokyo. |
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| Abstract: | The breathing pattern in children with asthma was studied, using respiratory inductive plethysmography. The subjects were 31 children with mild to moderate asthma (15 males, 16 females; aged 6∼15 years, average 11 years). The respiratory rate was 25.5±10.7/min. (mean ± S.D.) during asthma attacks and 18.4 ± 5.0/min. between attacks with a significant increase during attacks (P < 0.001). The expiratory time was 1.774 ± 0.833 second during attacks, and 2.125 ± 0.602 seconds between attacks. The expiratory time to total respiratory time ratio (TE/TTOT) was 0.631 ± 0.056 during attacks and 0.608 ± 0.035 between attacks. Thus there was a slight prolongation at the time of attack, but the difference was not significant. The tidal volume was increased slightly during mild and moderate attacks. VT/TI (mean inspiratory flow) was increased during attacks. The respiratory pattern was thoracic during attacks and changed to the abdominal pattern with improvement. |
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| Keywords: | Asthma Asthmatic attack Breathing pattern Respiratory inductive plethysmograph |
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