Existence of interference between the heart and respiratory sounds: preliminary report
- N Finahari1
© Finahari; licensee BioMed Central Ltd. 2012
Published: 20 March 2012
Heart diseases still persist as one of the first-ranked causes of mortality in the world and Indonesia. Currently, mortality from coronary heart diseases is estimated to reach 53.5 per 100,000 population . Auscultation is a fundamental diagnostic method for heart disease, noninvasive and inexpensive , but highly dependent on the expertise and experience of the listener. Improved accuracy of diagnosis is usually then performed through further examination using the electrocardiogram, magnetic resonance imaging and the computed tomography scan. Unfortunately, these tools require very expensive investment costs that are only available in large hospitals . This is the main reason for supporting the development of computer-based auscultation technique tools that are cheaper and are able to improve the accuracy and reliability of diagnosis on early stages . If the device can be designed as portable, then it can be used by heart disease patients for daily monitoring to avoid or minimize heart attack accidents. To improve the accuracy of heart auscultation analysis, usually the lung sound must be minimized, or vice versa. It is very difficult. This study tried to use heart and lung interference sounds as physiological parameters. So this preliminary research aims to prove that interference does occur between heart and respiratory sounds. This interference sound will be used as an analysis technique to improve the accuracy of a new auscultation device.
This research was conducted on nine randomly chosen volunteers whose heart sounds were recorded in two conditions: 30 seconds free and hold breathing. The heart sound recording process is done electronically using a modified standard stethoscope to generate digital data. Modifications were performed using a mic condenser combined with a voice processing system based on Windows XP. Accuracy of the equipment is ensured by the noise-signal ratio test.
The differences that can be noticed from the graphical visualization of recorded sounds are in the form of nodes and amplitude. These differences that indicate the frequency, sound color, strength and speed of sounds improve the existence of an interference wave between the heart and respiratory sounds. These characteristics will be used to design the new portable auscultation device.
- Persatuan Perawat Nasional Indonesia[http://inna-ppni.or.id/html]
- Javed F, Venkatachalam PA, Fadzil A: J Phys Conf Ser. 2006, 34: 1098-1105.View ArticleGoogle Scholar
- Stasis A, et al.: A Multiple Decision Tree Architecture for Medical Diagnosis: The Differentiation of Opening Snap, Second Heart Sound Split and Third Heart Sound. CMS Springer-Verlag; 2004:254-274.Google Scholar
- Mrowka R, Cimponeriu L, Patzak A, Rosenblum MG: Am J Physiol Regul Integr Comp Physiol. 2003, 285: R1395-R1401.View ArticlePubMedGoogle Scholar
- Schikowski T, et al.: Respir Res. 2007, 8: 1-11. 10.1186/1465-9921-8-1View ArticleGoogle Scholar
- Toledo E, et al.: Med Eng Phys. 2002, 24: 45-52. 10.1016/S1350-4533(01)00114-XView ArticlePubMedGoogle Scholar
- Darowski M: Front Med Biol Eng. 2000, 10: 157-165. 10.1163/15685570052062648View ArticlePubMedGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.