CN100396241C - A Method of Monitoring Respiratory Volume Using Chest Impedance - Google Patents

Abstract

The invention discloses a method for monitoring breathing gas volume with chest impedance. It solves the problem of single respiratory monitoring means and difficulty in evaluating patients’ respiratory function in the current clinical work, and provides a simple and easy-to-operate, accurate result, which can provide new parameters for the diagnosis of respiratory diseases and the evaluation of respiratory function. Chest Impedance Method for Monitoring Respiratory Volume. It uses a standard respiration measuring cylinder, impedance meter and computer to establish a respiration monitoring device. The standard measuring cylinder and impedance meter collect signals from the human body's respiration. Corresponding relationship, in order to realize the monitoring and real-time correction of respiratory function.

Description

A Method of Monitoring Respiratory Volume Using Chest Impedance

technical field

The invention relates to a method for monitoring respiration, in particular to a method for monitoring respiration volume with chest impedance.

Background technique

At present, in clinical work, it is often necessary to monitor the patient's respiratory function in order to identify changes in the condition in time and propose corresponding rescue and treatment plans. Especially for severe respiratory infectious diseases such as SARS and bird flu, as well as respiratory failure caused by various reasons, which require continuous monitoring of the patient's respiratory function. At present, various respiratory monitoring devices can only monitor the patient's respiratory rate, and there is no method and device for continuous monitoring of respiratory volume, respiratory rate and respiratory function. In some studies, although chest impedance respiration was used to monitor the respiratory volume, it is difficult to evaluate the patient's respiratory function due to the influence of factors such as human height, weight, chest circumference and monitoring electrodes.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the prior art, and provide a method for monitoring breathing volume with chest impedance that can effectively monitor respiratory function in real time.

In order to achieve the above object, the present invention adopts the following technical scheme: a method for monitoring respiratory volume with chest impedance, which includes the following steps, a, attaching the electrodes of the impedance meter to the chest of the human body;

b. Connect the standard measuring cylinder to the computer;

c. The human body uses the standard measuring cylinder to monitor the breathing from time to time, and sends the breathing air volume information and the impedance change signal of the human body measured by the impedance meter to the computer;

d. The computer determines the corresponding relationship between the gas volume information and the impedance signal change value, and establishes a benchmark for monitoring the human respiratory gas volume;

e. The computer uses the impedance meter to continuously monitor the impedance changes of the human body during respiration to form an impedance respiration map; at the same time, it calculates the breathing volume in real time according to the benchmark.

The electrodes in the step a are concentric silver electrodes, which are respectively placed at the level of the xiphoid process on the midaxillary line of the chest on both sides of the human body.

In the step c, a monitoring benchmark is established during the first breath monitoring, and each measured value is corrected in real time for the previous monitoring benchmark during each breath monitoring, and the human body performs at least three breathing movements during each breath monitoring.

In the step d, the monitoring standard is established according to the impedance change value corresponding to every 100ml of the gas volume value, so as to monitor the respiratory gas volume of the human body according to the impedance change value.

The present invention adopts a standard respiration measuring cylinder, an impedance meter and a computer to establish a respiration monitoring device, and the standard measuring cylinder and the impedance meter collect signals from the human body's respiration, and the computer draws an impedance respiration diagram with the collected electrical impedance signal, and establishes both The computer takes the first-order derivative of the data in the impedance respiration graph to obtain the impedance respiration differential graph, which is used to evaluate the respiratory movement rate; the computer can also take the second-order derivative of the data in the impedance respiration graph to obtain the impedance respiration differential graph. The order derivative diagram reflects the acceleration of respiratory movement and is used for the analysis of respiratory muscle mechanics and the evaluation of respiratory muscle function. Among them, the respiratory movement rate reflects the airflow velocity of human breathing, and its normal range is 3500-5000ml/s. The normal range of respiratory acceleration is 0-10000ml/s ² . In order to ensure the accuracy of the monitoring data, real-time correction is made to the breathing reference, thereby improving the accuracy of the breathing monitoring.

The advantage of the present invention is that the continuous monitoring of human respiration is realized, and the monitoring of respiratory frequency is converted into the monitoring of respiratory volume, so that it can better meet the needs. The whole method is simple and easy, and the result is accurate. Provides new parameters for the diagnosis and evaluation of respiratory function.

Description of drawings

Figure 1 is a respiratory impedance diagram.

Detailed ways

Embodiment one:

Take the breathing test of a 40-year-old male asthma patient as an example;

First, the standard measuring cylinder is connected to the computer, and the impedance meter is also connected to the computer. At the beginning of the monitoring, let the patient perform at least three breathing exercises through a standard metering cylinder, the volume of each breath is 1.2L, 1.3L, 1.17L, and the concentric silver electrodes of the impedance meter are placed on the chest on both sides of the human body At the horizontal position of the xiphoid process on the midaxillary line, the human body impedance values 1.4, 1.54, and 1.36 during breathing are sent to the computer, and the computer establishes a corresponding quantitative relationship 0.116, 0.118, and 0.137 according to the corresponding impedance change value per 100ml of the respiratory gas volume and impedance change value. And form the monitoring benchmark that is 0.124. Then, use the impedance meter to continuously send the change value of respiratory impedance to the computer, and the computer will form an impedance respiration map, as shown in Figure 1, and monitor the respiratory volume in real time according to the reference value. For example, when the impedance value is 1.49, the respiratory volume is 1.202L In this way, the breathing situation of the patient can be known.

In order to further understand the patient's respiratory ventilation flow rate, the computer can be used to obtain the first derivative of the relevant data in the respiratory diagram, so as to obtain the impedance respiratory differential diagram, which is used to reflect the ventilation flow rate during breathing.

In order to understand the function of the patient's respiratory muscles, a computer can be used to calculate the second derivative of the respiration graph to obtain a second derivative graph for evaluating respiratory acceleration, so as to monitor the function of the respiratory muscles.

In order to ensure the accuracy of respiration monitoring, it is necessary to calibrate the monitoring benchmark from time to time. During the calibration, the human body uses a standard measuring cylinder to breathe, re-determine the impedance change value corresponding to every 100ml, and establish an impedance respiration map on the new benchmark.

Claims (1)

1. A method for monitoring respiratory volume with chest impedance, characterized in that: it comprises the steps, a. Attach the concentric silver electrodes of the impedance meter to the horizontal position of the xiphoid process on the midaxillary line of the chest on both sides; b. Connect the standard measuring cylinder to the computer; c. The human body uses the standard metering cylinder to carry out respiratory monitoring from time to time. The monitoring benchmark is established during the first respiratory monitoring, and the measured values are corrected in real time for the previous monitoring benchmark during each subsequent respiratory monitoring. The human body performs at least three breathing exercises, and the breathing air volume information and the impedance meter simultaneously measure the human body impedance change signal during breathing and send it to the computer; d. The computer determines the corresponding relationship between the air volume information and the impedance signal change value, and establishes a benchmark for monitoring the human respiratory air volume according to the impedance change value corresponding to each 100ml of the air volume value, so as to monitor the human respiratory air volume according to the impedance change value; e. The computer uses the impedance meter to continuously monitor the impedance changes of the human body during respiration to form an impedance respiration graph; at the same time, calculate the breathing volume in real time according to the benchmark; the computer takes the first derivative of the data in the impedance respiration graph to obtain the impedance respiration differential graph for use Evaluate the rate of respiratory movement; the computer can also take the second derivative of the data in the impedance respiration diagram to obtain the second derivative diagram of impedance respiration, which reflects the acceleration of respiratory movement and is used for mechanical analysis of respiratory muscles and evaluation of respiratory muscle function.

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