Mean (± SE) values of cc-TQ, sas-TQ, MTT, CBV, CBF, TTP and PSV before and after acetazolamide challenge in hemisphere ipsilateral and contralateral to stenosis. Patient population with cc-TQ ipsilateral/contralateral ratio <1 (n = 5).

$p<0.05 baseline: ipsilateral vs contralateral; *p<0.05, **p<0.01, NSnot statistically significant, acetazolamide challenge versus baseline. cc-TQ–pial artery pulsation (cardiac component of the transillumination quotient); sas-TQ–the subarachnoid width (subarachnoid component of the transillumination quotient); MTT–mean transit time; CBV–cerebral blood volume; TTP–time to peak; PSV–peak systolic velocity; SE–standard error; ml–millilitres; g–gram; min.–minutes; s–seconds; cm–centimetres.