Figure 2
The upper panel shows the transcranial Doppler of the left middle cerebral artery with a prominent systolic spike with a diastolic descent in the Doppler tracing suggestive of reverberating flow seen in circulatory arrest. The lower panel shows the transcranial Doppler of the right middle cerebral artery with high resistance circulatory pattern with a high systolic peak and low diastolic velocity suggestive of malignant intracranial hypertension, with a pulsatility index (PI = peak systolic-end diastolic velocities/mean flow velocity) of 2.5. The optic nerve ultrasonography seen on the right side of the figure are corresponding to the side of the middle cerebral artery insonation and were measuring 7.2 mm and 6.4 mm in the left and right optic nerve sheaths, respectively.