METHOD FOR DIAGNOSING BRONCHIAL PASSABILITY DISORDERS Russian patent published in 2007 - IPC A61B5/08 

FIELD: medicine.

SUBSTANCE: method involves recording and analyzing breathing noise on trachea during forced expiration maneuver done by patient. Total duration of noise process T is measured. Patient chest circumference is additionally measured in calm breathing (CC₁) and at maximum inspiration (CC₂). Normalized noise process duration T_n is calculated as T_n = (a*T*(CC₁)^b/(CC₂)^c)^d, where a, b, c, d are the coefficients calculated by applying regression models on representative healthy people group of the same sex and the same age group with the patient. T_n exceeding threshold value, bronchial passability disorder is considered to be the case. The threshold value is defined as 82% percentile from T_n distribution in healthy people sample used in regression model analysis.

EFFECT: enhanced effectiveness in detecting people having bronchial passability disorders.

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