Fig 2.

Representative serial angiograms of the canine BA.

A, Physiologic saline (0.5 ml/kg) was injected into the ventral CM. No constriction is noted during the 14-day observation period.

B, Autologous blood (0.25 ml/kg) was injected into the ventral CM. Severe constriction is present on day 3. Over time, the diameter of the BA gradually returns to normal.

C, Autologous blood (0.5 ml/kg) was injected into the ventral CM. There are sites with severe arterial constriction on days 3 and 7 after SAH induction; severe vasoconstriction persists on days 10 and 14.