Figure 2.

Parenchymal arterioles respond normally to hypercapnia one month after SAH. (a) Representative two-photon microscopy images of pial (top panels) and parenchymal (bottom panels) arterioles of sham and SAH mice before and during 10% CO₂ inhalation. (b) Pial and (c) parenchymal artery diameter quantification during hypercapnia in mice subjected to sham surgery (white symbols) or SAH (grey symbols). Arteriolar dilation in response to hypercapnia relative to baseline was verified in pial and parenchymal arterioles in sham-operated mice. Parenchymal arterioles in SAH mice also dilated in response to hypercapnia. Mean ± SD. 12 to 24 arterioles in (b) and 12 to 15 arterioles in (c) in n = 7 to 8 mice per group.