Sistema para monitoração da frequência cardíaca, respiratória e detecção da apnéia.

Abstract

The purpose of the research for this dissertation is to make a study that allows the development of a system to monitor the respiratory frequency and detection of the obstructive apnea of the sleep. The lack of respiratory movements, which is the apnea, characterizes an interruption in the flow of air that goes to the lungs, this result in a diminution in the amount of oxygen in the blood, causing serious and irreversible problems with severe consequences without the possibility of treatment, and also can leave the patient to its obit. There are many ways to accomplish the measure of the respiratory flow, these are divided in direct and indirect methods. Among these, it was chosen the indirect method, the technique of the thoracic impedance to accomplish these objectives. This method was chosen by possibility of utilize the same electrodes to obtain also the signal of ECG (Electrocardiogram). The practical performance of the circuit was tested in patients with central apnea, tends a good performance.