Abstract
Spectral analysis of RR interval and systolic arterial pressure variability was applied for the non invasive assessment of the baroreflex gain in Congestive Chronic Heart Failure (CHF). Forty-nine CHF patients were studied during rest, controlled breathing and head-up tilt. The alpha index, a non invasive measure of the overall gain of the RR to systolic arterial pressure (SAP) relationship, and a modified version called beta, incorporating the weighted coherence function, were computed in the low (LF) and high (HF) frequency bands by spectral analysis, and compared with the phenylephrine test slope. A linear model fitted on the beta index values during rest and controlled breathing showed a high correlation (r = 0.93, standard error of the estimation = 2.5 ms/mmHg) with the phenylephrine test slope. In severe CHF patients the beta index proposed, evaluated during rest and controlled breathing, may improve the baroreflex gain estimation and provide a non invasive assessment method that might be useful in gauging prognosis.
Original language | English |
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Title of host publication | Computers in Cardiology |
Publisher | IEEE Comp Soc |
Pages | 203-206 |
Number of pages | 4 |
Publication status | Published - 1997 |
Event | Proceedings of the 1997 24th Annual Meeting on Computers in Cardiology - Lund, Sweden Duration: Sep 7 1997 → Sep 10 1997 |
Other
Other | Proceedings of the 1997 24th Annual Meeting on Computers in Cardiology |
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City | Lund, Sweden |
Period | 9/7/97 → 9/10/97 |
ASJC Scopus subject areas
- Software
- Cardiology and Cardiovascular Medicine