Figure 9. Typical variations in LDF and iREG (REG integral) during bleeding. The rise in iREG pulse amplitudes suggested CBF autoregulation (arteriolar vasodilation); local cortical LDF passively followed SAP, with higher pulse amplitudes; and CO₂ was marginally reduced. Left side: baseline; MABP dropped to 40 mm Hg in 15 minutes; right side plateau: 40 mm Hg in 30 minutes. iREG CBF; Laser Doppler flow CBF (integrating probe: 7 sensors in a 6 mm circular array) .

From

The noninvasive neuromonitoring in medicine: Rheoencephalography (REG)

Nguyen Hoang Tin, Tran Thai Thanh Tam, Phung Minh Thu

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