NDLI: Ventilatory and peripheral O/sub 2/ saturation oscillations during spontaneous and voluntary periodic breathing: a spectral analysis approach

Content Provider	IEEE Xplore Digital Library
Author	Pinna, G.D. Maestri, R. Mortara, A. La Rovere, M.T. Prpa, A. Fanfulla, F. Bruschi, C.
Copyright Year	1997
Description	Author affiliation: S. Maugeri Found., Rehabilitation Inst. of Montescano, Pavia, Italy (Pinna, G.D.)
Abstract	It has been hypothesized that the periodic breathing (PB) pattern often observed in chronic heart failure (CHF) patients (pts) originates from the instability of the feedback loop controlling ventilation, due to the prolonged circulation time of these pts. To test this hypothesis, we studied the relationship between the instantaneous tidal volume (ITV) and O/sub 2/ saturation at the ear (SpO/sub 2/) in 24 CHF pts during sustained episodes of PB and 13 healthy subjects during voluntary PB. Some basic modeling assumptions about the respiratory control system were made and, following the hypothesis, a set of expected results formulated. The relationship between SpO/sub 2/ and ITV was analyzed by bivariate spectral analysis and the phase shift and time delay at the PB frequency estimated. The ITV oscillation in CHF patients always mirrored and anticipated the contemporary oscillation of SpO/sub 2/ with a phase shift of -145/spl plusmn/19/spl deg/ and a delay of -3.3 s. The oscillation of SpO/sub 2/ was also a delayed version of the ITV, with a lung-to-ear circulation time (LECT) of 27.9/spl plusmn/6 s. The SpO/sub 2/ oscillation of healthy subjects was simply a delayed version of the ITV due to LECT. The phase shift was 123/spl plusmn/37/spl deg/, with a corresponding LECT of 15.5/spl plusmn/5 s. Provided the ventilatory open loop gain of CHF patients with PB is /spl ges/1, the results of this study are in good agreement with theoretical expectation and support the instability hypothesis of PB in these pts.
Starting Page	2157
Ending Page	2160
File Size	383824
Page Count	4
File Format	PDF
ISBN	0780342623
ISSN	1094687X
DOI	10.1109/IEMBS.1997.758782
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-30
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectral analysis Delay effects Frequency estimation Heart Feedback loop Ventilation System testing Ear Control system synthesis Delay estimation
Content Type	Text
Resource Type	Article

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