Continuous estimates of dynamic cerebral autoregulation during transient hypocapnia and hypercapnia
نویسندگان
چکیده
منابع مشابه
Continuous estimates of dynamic cerebral autoregulation during transient hypocapnia and hypercapnia.
Dynamic cerebral autoregulation (CA) is the transient response of cerebral blood flow (CBF) to rapid blood pressure changes: it improves in hypocapnia and becomes impaired during hypercapnia. Batch-processing techniques have mostly been used to measure CA, providing a single estimate for an entire recording. A new approach to increase the temporal resolution of dynamic CA parameters was applied...
متن کاملGraded hypercapnia and cerebral autoregulation during sevoflurane or propofol anesthesia.
BACKGROUND Hypercapnia abolishes cerebral autoregulation, but little is known about the interaction between hypercapnia and autoregulation during general anesthesia. With normocapnia, sevoflurane (up to 1.5 minimum alveolar concentration) and propofol do not impair cerebral autoregulation. This study aimed to document the level of hypercapnia required to impair cerebral autoregulation during pr...
متن کاملCerebral blood flow velocity underestimates cerebral blood flow during modest hypercapnia and hypocapnia.
To establish the accuracy of transcranial Doppler ultrasound (TCD) measures of middle cerebral artery (MCA) cerebral blood flow velocity (CBFV) as a surrogate of cerebral blood flow (CBF) during hypercapnia (HC) and hypocapnia (HO), we examined whether the cross-sectional area (CSA) of the MCA changed during HC or HO and whether TCD-based estimates of CBFV were equivalent to estimates from phas...
متن کاملApplying time-frequency analysis to assess cerebral autoregulation during hypercapnia
OBJECTIVE Classic methods for assessing cerebral autoregulation involve a transfer function analysis performed using the Fourier transform to quantify relationship between fluctuations in arterial blood pressure (ABP) and cerebral blood flow velocity (CBFV). This approach usually assumes the signals and the system to be stationary. Such an presumption is restrictive and may lead to unreliable r...
متن کاملContinuous estimates of dynamic cerebral autoregulation: influence of non-invasive arterial blood pressure measurements.
Temporal variability of parameters which describe dynamic cerebral autoregulation (CA), usually quantified by the short-term relationship between arterial blood pressure (BP) and cerebral blood flow velocity (CBFV), could result from continuous adjustments in physiological regulatory mechanisms or could be the result of artefacts in methods of measurement, such as the use of non-invasive measur...
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ژورنال
عنوان ژورنال: Journal of Applied Physiology
سال: 2010
ISSN: 8750-7587,1522-1601
DOI: 10.1152/japplphysiol.01157.2009