The measurement of nonelastic work of breathing using a commercially available respiratory integrator.
The authors compared real-time, breath-by-breath work of breathing (WOB) measurements made with a Hewlett-Packard 8815A respiratory integrator with nonelastic WOB values obtained by planimetry of pressure-volume tracings. They measured WOB while normal subjects breathed through a low-resistane mouthpiece. The integrator-derived values for WOB correlated well with planimeter-derived values (r = 0.97). Valid measurements of nonelastic WOB can be made at the bedside in realtime using the Hewlett-Packard 8815A without the addition of custom-built circuitry or hardware.
Plost
G N
GN
Division of Respiratory Sciences, University of Arizona College of Medicine, Tucson.
Campbell
S C
SC
Vagedes
R T
RT
Shon
B Y
BY
D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D012016:Reference Values; D014939:Work of Breathing / Q000502:physiology*