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AN ADDITIVE METHOD FOR AIRWAY RESISTANCE MEASUREMENT
Author(s) -
KUREš H.
Publication year - 1974
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.1974.tb04809.x
Subject(s) - medicine , airway resistance , plethysmograph , airway , breathing , flow resistance , significant difference , flow (mathematics) , anesthesia , mathematics , geometry
. Kureš, H. (Physiological Laboratory of the Paediatric Clinic, Karolinska Hospital, Stockholm, Sweden and the Research Institute for Child Development, Charles University, Prague, Czechoslovakia). An additive method for airway resistance measurement. Acta Paediatr Scand, 63: 351, 1974.–In order to increase the possibilities of determining the airway resistance, especially in children, an additive method has been developed which does not require cooperation of the subject being examined nor estimation of alveolar pressure. By means of mathematical derivations it is shown that the ratio mouth pressure difference and flow difference at instant change of additive resistances gives the airway resistance in laminar as well as nonlaminar flow. Besides a recording unit, the equipment consists of a special pick‐up tube with three parts: a flow pick‐up, a mouth pressure pick‐up and two added resistances with means for alternating between them. The method has been tested by using artificial flow resistances and by means of a conventional body plethysmographic method in 4 healthy adults, 10 healthy children and 8 asthmatic children. A correspondence within ±4% of obtained values was found with no significant differences. The method does not call for any artificial breathing manoeuvre, does not cause any unpleasant sensation and allows repetition at short intervals.