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Table 3 BHIs derived from TCD and NIRS signals for the case studies. Values of the BHI and of the slope of the O2Hb and CO2Hb concentration signals derived from the NIRS data for the two case studies. The first row reports the BH indicators for subject A, the second row reports the same indicators for the first test of subject B, and the third row reports the same indicators for the second test of subject B.

From: Relationship between oxygen supply and cerebral blood flow assessed by transcranial Doppler and near – infrared spectroscopy in healthy subjects during breath – holding

  BHI V (%/s) PI baseline PI BH (μ mol/1/s) (μ mol/1/s) (μ mol/1/s) (μ mol/1/s)
Subject A 0.82 0.86 0.70 0.054 0.051 0.132 0.158
Subject B – 1st test 0.05 0.61 0.64 0.0075 0.0005 0.015 0.0004
Subject B – 2nd test 0.9 0.63 0.60 0.046 -0.0048 0.026 0.046