Long-term recording and automatic analysis of cough using filtered acoustic signals and movements on static charge sensitive bed.

Abstract:

:Reliable long-term assessment of cough is necessary in many clinical and scientific settings. A new method for long-term recording and automatic analysis of cough is presented. The method is based on simultaneous recording of two independent signals: high-pass filtered cough sounds and cough-induced fast movements of the body. The acoustic signals are recorded with a dynamic microphone in the acoustic focus of a glass fiber paraboloid mirror. Body movements are recorded with a static charge-sensitive bed located under an ordinary plastic foam mattress. The patient can be studied lying or sitting with no transducers or electrodes attached. A microcomputer is used for sampling of signals, detection of cough, statistical analyses, and on-line printing of results. The method was validated in seven adult patients with a total of 809 spontaneous cough events, using clinical observation as a reference. The sensitivity of the method to detect cough was 99.0 percent, and the positive predictivity was 98.1 percent. The system ignored speaking and snoring. The method provides a convenient means of reliable long-term follow-up of cough in clinical work and research.

journal_name

Chest

journal_title

Chest

authors

Salmi T,Sovijärvi AR,Brander P,Piirilä P

doi

10.1378/chest.94.5.970

subject

Has Abstract

pub_date

1988-11-01 00:00:00

pages

970-5

issue

5

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(16)31407-6

journal_volume

94

pub_type

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