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Enhanced external counterpulsation does not compromise cerebral autoregulation
Author(s) -
Marthol H.,
Werner D.,
Brown C. M.,
Hecht M.,
Daniel W. G.,
Hilz M. J.
Publication year - 2005
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.2004.00352.x
Subject(s) - cardiology , medicine , cerebral autoregulation , autoregulation , blood pressure , heart rate , cerebral blood flow , diastole , hemodynamics
Objectives – Enhanced external counterpulsation (EECP) rhythmically augments blood pressure (BP) by diastolic lower‐body compression. Recently, we showed decreased mean cerebral blood flow velocity (CBFV mean ) in young healthy persons during EECP, but unchanged CBFV mean in atherosclerotic patients. In this study, we assessed EECP effects on dynamic cerebral autoregulation (CA). Material& methods – In 23 healthy persons and 15 atherosclerotic patients we monitored heart rate (HR), mean BP (BP mean ) and CBFV mean before and during 5 min EECP. We analyzed spectral powers of HR, BP mean and CBFV mean in the low (LF: 0.04–0.15 Hz) and high (HF: 0.15–0.5 Hz) frequency ranges to determine CA from the LF‐transfer function gain and phase shift between BP mean and CBFV mean oscillations. Results – EECP increased HR and BP mean , while transfer function gain and phase shift remained stable. Conclusions – Stable gain and phase values suggest that EECP does not compromise CA and, therefore, does not seem to bear cerebrovascular risks.