METHOD FOR DIAGNOSING RESPIRATORY FAILURE IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE Russian patent published in 2021 - IPC A61B5/83 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to pulmonology and functional diagnostics, and can be used to diagnose respiratory failure in chronic obstructive pulmonary disease (COPD). The method includes identifying the degree of respiratory failure based on determining the level of blood oxygen saturation during pulse oximetry at rest, the minimum level of blood oxygen saturation during the test with a 6-minute walk and filling out a questionnaire by the patient. The severity of shortness of breath when filling out the questionnaire is evaluated in points on a scale: shortness of breath does not bother, except for very intense exercise 1 point, shortness of breath worries when walking fast or climbing a small elevation 2 points, shortness of breath leads to slower walking compared to other people of the same age or there is a need to make stops when walking at a normal pace on a flat surface 3 points, shortness of breath makes it impossible to leave the house or appears when dressing and undressing 4 points. Then the calculation of the respiratory failure index is performed in conventional units according to the formula: IRF = (SpO₂ initial - SpO₂ minimum) * M, where IRF is the index of respiratory failure (standard units), SpO₂ initial the level of saturation at rest (%), SpO₂ minimum the minimum level of saturation recorded during the test with a 6-minute walk (%), M is the result of the questionnaire in points. If the IRF value does not exceed 8 CU the degree of respiratory insufficiency detected when determining the level of blood oxygen saturation during pulse oximetry at rest is not corrected, with values of IRF equal to or more than 8 CU, the detected degree of respiratory insufficiency is increased to the following degree.

EFFECT: use of the invention makes it possible to objectively and non-invasively clarify the degree of respiratory failure in patients with COPD.

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