Airway resistance judgment based on diaphragmatic electromyogram

Abstract

The invention relates to a method for adopting a diaphragmatic electromyogram to judge an airway resistance, namely applying the change of the ratio of the diaphragmatic electromyogram to an airflow to judge change of a lower airway resistance. The diaphragmatic electromyogram can be recorded through an esophagus electrode and can be also recorded through a surface electrode. An airflow signal can be obtained through various flow meters and is represented in the form of peak flow rate, mean flow rate, tidal volume and the like. The change of the lower airway resistance is reflected through the change of the ratio of the diaphragmatic electromyogram to the airflow. When a bronchial provocation test is performed, airway shrinkage of an asthma patient causes increase of the lower airway resistance, and the ratio of the diaphragmatic electromyogram to the airflow rises at the moment. Similar to the principle, a bronchodilator causes airway relaxation during asthmatic attack, accordingly the airway resistance is reduced, and the ratio of the diaphragmatic electromyogram to the airflow is also reduced with the resistance reduction. The method does not need a lung function instrument, and medical resources are saved. A patient only needs to perform eupnea, and a complicated checking routine is simplified. The method is suitable for checking of airway hyperresponsiveness and airway obstruction reversibility of lots of patients, especially the old, children and unconscious patients.

Description

(1) Technical field [0001] The invention relates to a method for judging lower airway resistance by using diaphragm myoelectricity. (2) Background technology [0002] Airway hyperresponsiveness refers to the abnormal increase of the airway itself to various specific and non-specific stimuli. It is the main feature that distinguishes patients with bronchial asthma from normal people. It is mainly judged by bronchial challenge test or bronchiectasis test. Gas flow indicators are often used clinically (such as forced expiratory volume in the first second (FEV 1 ), maximum peak expiratory flow (PEF) to reflect airway resistance, and judge the results of bronchial provocation test or bronchodilation test according to changes in airway resistance. FEV 1 , PEF changes to judge airway resistance, and the method of evaluating the results of bronchoprovocation test or bronchiectasis test needs to be equipped with a lung function tester, and the patient is required to cooperate with ...

AI Technical Summary

Problems solved by technology

Many patients, especially children and the elderly often have poor comprehension, and it is difficult to master the essentials of maximal inhalation and exhalation, resulting in failure of the examination

In addition, studies have found that measuring FEV 1 The maximum forceful inspiratory action required during the time will reduce the airway resistance value and affect the reliability of asthma diagnosis

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned methods of reflecting lower airway resistance with lung function (such as FEV1 and PEF and other indicators), and invent a new method to judge lower airway resistance

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