Testing the Existence of Cardiorespiratory Interference Sounds

Finahari, Nurida; Sakti, Setyawan P.; Ratnawaty, Retty; Indra, M. Rasjad
July 2014
Australian Journal of Basic & Applied Sciences;Jul2014, Vol. 8 Issue 10, p365
Academic Journal
Background: Auscultation technique is the action of hearing body sounds as basic diagnostic. Heart sound auscultation is presumed easier to be done than the lung sound. This is due to the anatomical condition of the heart that produce sounds more certain with sound sources that easier to detected. In contrary, anatomical condition of the lungs show the complexity in sound production, identification and analysis. In the other side, heart and lung sound interferences very possible to be occur, besides the factor of their location in the chest cavity, it also because of the inter-influences action of that organs in sound production processes. This phenomenon will open the opportunity to use that phenomenon as diagnostic tool for cardio-respiratory diseases that promises the modestly and low costing. Objective: This research was conducted to prove that hypothesis even still be done in the state of heart performance analysis. In this condition, interference sound was extracted from the record of heart auscultation. Results: This effort was done by two research stages where the first was the process of getting data by standard technique of auscultation with the stethoscope that is connected to computer and then was analyzed by windows program. The second stage was the validation processes that involved synchronization test. In this stage, heart sounds was recorded simultaneously with respiratory cycles and ECG recording. The record was digitalized by ADC equipments that connected to computer and analyzed by Mathlab program. The research results show that interference sounds appear in the form of heart sound intensity difference, range of frequency, and graphical contour, between the data that have been recorded in the free and hold breathing condition. These parameter can be called as the color of sound (timbre). The color of sound can be observed and was analyzed easier if presented in the form of spectral graphic. The results of first and second research stages do not show significant differences. The results of spectral analysis show the existence of phase shifting and signal missing phenomena. The phase shifting phenomenon correlate with respiratory cycles, meanwhile the signal missing correlate with ECG record. Conclusion: The research results show that (1) cardiorespiratory interference sound does exists, and (2) the usage of interference sounds as heart physiological parameter does possible.


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