The relationship between the ivy sign score and SPECT findings*

Ivy Sign Score (No. of Regions)Resting CBF (mL/100 g/min), Median (25th Percentile, 75th Percentile)CVR (%), Median (25th Percentile, 75th Percentile)
0 (115)33.3 (30.4, 37.2)9.1 (1.8, 30.1)
1 (37)32.4 (28.6, 35.0)4.3 (−5.7, 21.5)
2 (40)31.6 (28.2, 33.6)−0.2 (−7.4, 5.3)
  • Note:—SPECT indicates single-photon emission CT; CBE, cerebral blood flow; CVR, cerebral vascular reserve.

  • * As the ivy sign score increased, the median value of the resting CBF decreased slightly (P = .0034). On the other hand, as the ivy sign score increased, the median value of the CVR decreased more obviously (P < .001).