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Table 1 BHI and PI indexes derived from TCD signals. Population averaged values of the BHI and of the PIs derived from the TCD measurements. The first row depicts the percentage increment of the CBFV (BHI V ), whereas the second and third rows depict the PI during baseline and after BH respectively. All the values are expressed as mean/sd.

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) 1.28/0.71
PI baseline 0.86/0.13
PI BH 0.66/0.12