Table 1. Reactivity in the pre-Willis cerebral arteries as assessed by ultrasound imaging in naive rat pups (n = 5) and 15 min after ischemia-reperfusion (n = 5) during normoxia (air), hypercapnia (5% CO2), and return to normoxia.

		Air	5% CO2	5% CO2
Naive	BT	7.4±1.2	6.2±2.3	7.3±1.0
	Left ICA	10.6±1.5	8.3±2.7	10.2±1.5
	Right ICA	11.7±2.0	8.2±4.0	10.4±0.7
	Heart rates	319±34	230±21	205±24
Reperfusion	BT	9.0±0.7	7.8±0.9	8.8±0.6
	Left ICA	6.6±3.0	5.1±1.7	6.4±2.5
	Right ICA	3.5±0.7	2.8±0.6	3.4±0.6
	Heart rates	292±41	261±7	250±10

Data represent mean BFVs measured in cm.s−1 in the three pre-Willis cerebral arteries (±SD): BT, basilar trunk; ICA, internal carotid artery. Heart rates are given in bpm.