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1 INSERM E0107, Faculte de Medecine, Paris, France
2 Laboratoire d'Explorations Fonctionnelles Vasculaires, CHU, Angers, France
3 Laboratoire d'Explorations Fonctionnelles Renales, Hopital Jean Minjoz, Besancon, France
4 Unita' di Bioingegneria, LaRC, Fondazione Don Carlo Gnocchi, Milano, Italy
5 CNRS UMR 5014, Faculte de Pharmacie, Lyon, France
6 Laboratoire de Physiologie, CNRS UMR 1523, Faculte de Medecine, Lyon, France
7 Pharmacology and Toxicology, CARIM, Maastricht, The Netherlands
8 Physiology, Academish Medish Centrum, Amsterdam, The Netherlands
9 Unita' di Bioingegneria, LaRC, Fondazione Don Carlo Gnocchi, Milano, Italy; Department of Internal Medicine; Department of Cardiology, University of Milano-Bicocca; San Luca Hospital, Istituto Auxologico Italiano, Milano, Italy
10 Institut fur Physiologie, Humboldt Universitat, Berlin, Germany
11 Dipartimento di Scienze Precliniche, Universita' degli Studi di Milano, LITA di Vialba, Milano, Italy
12 Institute of Occupational and Social Medicine, University of Technology, Dresden, Germany
13 Institut fur Physiologie, Humboldt Universitat, Berlin, Germany; Department of Exercise Science, The University of iowa City, Iowa City, Iowa, USA
* To whom correspondence should be addressed. E-mail: dlaude{at}bhdc.jussieu.fr.
This study compared spontaneous baroreflex sensitivity (BRS) estimates obtained from an identical set of data by 11 European centers using different methods and procedures. Non-invasive blood pressure (BP) and ECG recordings were obtained in 21 subjects including two subjects with established baroreflex failure. Twenty one estimates of BRS were obtained by methods including the two main techniques of BRS estimates, i.e. the spectral analysis (11 procedures) and the sequence method (7 procedures) but also 1 trigonometric regressive spectral analysis method (TRS), 1 exogenous model with autoregressive input method (X-AR) and 1 Z method. With subjects in a supine position, BRS estimates obtained with calculations of alpha coefficient or gain of the transfer function both in the low frequency band or high frequency band, TRS, and sequence methods gave strongly related results. Conversely, weighted gain, X-AR and Z exhibited lower agreement with all the other techniques. In addition, the use of mean BP instead of systolic BP in the sequence method decreased the relationships with the other estimates. Some procedures were unable to provide results when BRS estimates were expected to be very low in data sets (in patients with established baroreflex failure). The failure to provide BRS values was due to setting of algorithmic parameters too strictly. The discrepancies between procedures show that the choice of parameters and data handling should be considered prior to BRS estimation. These data are available on the web site (http://www.cbi.polimi.it/glossary/eurobavar.html) to allow the comparison of new techniques with this set of results.
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