Fig 3. A, Diffusion, ADC, and quantitative CBF map generated from the PASL sequence obtained in patient 8 one day before the global anoxic event shows restricted diffusion and hypoperfusion in the left posterior watershed territory corresponding with areas of subacute infarction (arrowheads). B, Diffusion, ADC, and quantitative CBF map obtained 3 days after the episode of pulseless electrical activity in patient 8 shows interval worsening of the diffusion abnormality (arrowhead) with new marked global hyperperfusion. There is relative sparing of the previous subacute infarct in the left posterior MCA territory (arrow). Quantitative analysis performed by placing regions of interest over the entire section showed an average CBF increase from 31.4 to 188.6 mL/100 g of tissue per minute.