HIF1A and transient ischemic attack: At 48 h, HIF-1α serum level, in control subjects, was 2095 ± 115 pg/mL and it significantly decreased, in comparison to T0, in both AIS and TIA patients (3087 ± 213 and 2632 ± 175 pg/mL, respectively, both p < 0.01 vs. T0) (Figure 3).