An interactive computer analysis of the aortic ejection click and first heart sound

The aortic ejection click and the first heart sound (S1) are described in the time and frequency domains from computer processed phonocardiogram data obtained from 13 valvar aortic stenosis patients and 6 normal ones. The interactive FOBTRAI program developed was capable of the following: (1) computing averages, aligned averages, power spectra of selected segments, envelograms, and deterministic signals; (2) storing and retrieving intermediate results; and (3) plotting data. The program is listed and its interaction is fully described in this thesis. The following steps were used to analyze the data: (1) the determination of the click onset times; (2) the generation of aligned average cardiocycles for both the click and S1; and (3) the calculation of power spectra for selected segments of the click and S1. The tabulated results typically show 2 frequencies in 51 and 3 in the click, with the click being distinguished by an oscillation between 160 and 230 Hz. Characteristics of the click versus time are also tabulated.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Electrical Engineering

Department dc:contributor.department

Electrical Engineering

Grantor dc:publisher

Virginia Polytechnic Institute and State University

Year dc:date.issued

1978

Author dc:creator

• Showalter, Samual Joseph

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10919/64551

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/64551