Author (authors): Konstantin Pavlovich Buteyko
Patent Holder: same
Application N 4136914
Priority of invention of October 17, 1986
Registered in the USSR Government Register of Inventions on May 22, 1990

PATENT DISCLOSURE

DETECTION OF CO₂ IN ALVEOLAR AIR

This invention relates to medicine and may be used for pulmonary system therapy. The purpose of this invention is to facilitate the method while maintaining precision. The method is performed as follows. The sitting patient-s expiratory capacity is timed after a 5-10 minute rest. The level of carbon dioxide is then detected in accordance with the formula
P=P0+KT,
where P is the percentage of CO₂ in the alveolar air; P0 is the 3.5 minimum percentage of CO₂ in the alveolar air; K=0.05 is the dependency ratio between the level of CO₂ and the breath-holding time; and T is the maximum breath-holding time.
Example 1. Patient V., 32 years old. Diagnosis: bronchial asthma. CO₂ level detection is performed 6 times after a 3-minute march in place and post-marching rest for 4, 5, 6, 7, 10 and 12 minutes. The results are given in Table 1.
Example 2. Patient R., 48 years old. Diagnosis: chronic bronchitis. The level of CO₂ in the alveolar air was detected similarly. The results are given in Table 2.

CLAIMS
A method for detection of CO₂ level in the alveolar air by examination of the respiratory system values, wherein the purpose of method facilitation is achieved by stopwatch timing of the patient-s maximum respiratory capacity after a 5-10 minute rest, and the level of CO₂ is detected in accordance with the following formula:
P=P0+KT,
where P is the percentage of CO₂ in the alveolar air; P0 is the 3.5 minimum percentage of CO₂ in the alveolar air; K=0.05 is the dependency ratio between the level of CO₂ and the breath-holding time; and T is the maximum breath-holding time.