Development of a Korotkov Sound Processor for Automatic Identification of Auscultatory Events - Part I: Specification of Preprocessing Bandpass Filters

Frequency bands that best discriminate the Korotkov sounds at systole and at diastole from the sounds immediately preceding these events are defined. Korotkov sound data were recorded from five normotensive subjects during orthostatic stress [lower body. negative pressure (LBNP)] and bicycle ergomet...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1974-03, Vol.BME-21 (2), p.114-118
Main Authors: Golden, Donald P., Wolthuis, Roger A., Hoffler, G. Wyckliffe, Gowen, Richard J.
Format: Article
Language:English
Subjects:
Band pass filters
Biomedical measurements
Blood pressure
Frequency
Laboratories
Logic circuits
NASA
Passband
Pressure measurement
Space technology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Frequency bands that best discriminate the Korotkov sounds at systole and at diastole from the sounds immediately preceding these events are defined. Korotkov sound data were recorded from five normotensive subjects during orthostatic stress [lower body. negative pressure (LBNP)] and bicycle ergometry. A spectral apalysis of the seven Korotkov sounds centered about the systolic and diastolic auscultatory events revealed that a maximum increase in amplitude at the systolic transition occurred in the 18-26-Hz band, while a maximum decrease in amplitude at the diastolic transition occurred in the 40-60-Hz band. These findings were remarkably consistent across subjects and test conditions. These passbands are included in the design specifications for an automatic blood pressure. measuring system used in conjunction with medical experiments during NASA's Skylab program.
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.1974.324296