Effects of CO2 on dynamic cerebral autoregulation measurement.

@article{citeulike:782751, abstract = {Arterial pCO2 is known to influence cerebral autoregulation but its effect on the dynamic relationship between mean arterial blood pressure (ABP) and mean cerebral blood flow velocity (CBFV), obtained from spontaneous fluctuations in ABP, has not been established. In 16 normal subjects, ABP was measured non-invasively (Finapres), CBFV was estimated with Doppler ultrasound in the middle cerebral artery, and end-tidal CO2 (EtCO2) was measured with an infrared capnograph. Recordings were made before, during and after breathing a mixture of 5\% CO2 in air. The coherence function, amplitude and phase frequency responses, and impulse and step responses for the effects of ABP on CBFV were calculated by spectral analysis of beat-to-beat changes in mean ABP and CBFV before (mean CO2 5.55 +/- 0.38 kPa), during (6.43 +/- 0.31 kPa) and after 5\% CO2 (5.43 +/- 0.26 kPa). During 5\% CO2, the coherence function and the amplitude frequency response were significantly increased for frequencies below 0.05 Hz and the phase was reduced for the frequency range 0.02-0.1 Hz. The impulse and step responses indicated that 5\% CO2 reduces the efficiency of the autoregulatory mechanism. A 20.7\% average increase in CBFV induced by a 14.4\% increase in EtCO2 was found to be mediated by a 25.9\% reduction in critical closing pressure, while the change in resistance area product was non-significant.}, address = {Division of Medical Physics, Faculty of Medicine, University of Leicester, Leicester Royal Infirmary, UK. rp9@le.ac.uk}, author = {Panerai, R. B. and Deverson, S. T. and Mahony, P. and Hayes, P. and Evans, D. H. }, citeulike-article-id = {782751}, issn = {0967-3334}, journal = {Physiol Meas}, keywords = {autoregulation, co2}, month = {August}, number = {3}, pages = {265--275}, posted-at = {2006-08-02 14:48:27}, priority = {0}, title = {Effects of CO2 on dynamic cerebral autoregulation measurement.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/10475580}, volume = {20}, year = {1999} }

TY - JOUR ID - citeulike:782751 L3 - citeulike-article-id:782751 TI - Effects of CO2 on dynamic cerebral autoregulation measurement. JF - Physiol Meas VL - 20 IS - 3 SP - 265 EP - 275 AD - Division of Medical Physics, Faculty of Medicine, University of Leicester, Leicester Royal Infirmary, UK. rp9@le.ac.uk SN - 0967-3334 N2 - Arterial pCO2 is known to influence cerebral autoregulation but its effect on the dynamic relationship between mean arterial blood pressure (ABP) and mean cerebral blood flow velocity (CBFV), obtained from spontaneous fluctuations in ABP, has not been established. In 16 normal subjects, ABP was measured non-invasively (Finapres), CBFV was estimated with Doppler ultrasound in the middle cerebral artery, and end-tidal CO2 (EtCO2) was measured with an infrared capnograph. Recordings were made before, during and after breathing a mixture of 5% CO2 in air. The coherence function, amplitude and phase frequency responses, and impulse and step responses for the effects of ABP on CBFV were calculated by spectral analysis of beat-to-beat changes in mean ABP and CBFV before (mean CO2 5.55 +/- 0.38 kPa), during (6.43 +/- 0.31 kPa) and after 5% CO2 (5.43 +/- 0.26 kPa). During 5% CO2, the coherence function and the amplitude frequency response were significantly increased for frequencies below 0.05 Hz and the phase was reduced for the frequency range 0.02-0.1 Hz. The impulse and step responses indicated that 5% CO2 reduces the efficiency of the autoregulatory mechanism. A 20.7% average increase in CBFV induced by a 14.4% increase in EtCO2 was found to be mediated by a 25.9% reduction in critical closing pressure, while the change in resistance area product was non-significant. KW - autoregulation KW - co2 AU - Panerai, RB AU - Deverson, ST AU - Mahony, P AU - Hayes, P AU - Evans, DH PY - 1999/08// UR - http://view.ncbi.nlm.nih.gov/pubmed/10475580 ER -