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Input circuit of electrical model of the cerebrovascular bed and diagram demonstrating the resulting modulus of impedance |z(f)| where f stands for frequency in Hz. Ca, cerebrovascular compliance; Ra, cerebrovascular resistance; CPP, mean cerebral perfusion pressure; FV, mean flow velocity; A1 and F1, first harmonics' amplitudes of arterial blood pressure (ABP) and FV, respectively; HR, frequency (beats/second).
