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. Author manuscript; available in PMC: 2013 Aug 21.
Published in final edited form as: Neurocrit Care. 2012 Aug;17(1):77–84. doi: 10.1007/s12028-012-9721-1

Figure 1.

Figure 1

Intraoperative autoregulation recording with transcranial Doppler based mean velocity index (Mx, blue) and near infrared spectroscopy based cerebral oximetry index (COx, green). The Mx and COx data from the left and right hemisphere are placed into 5 mmHg arterial blood pressure (ABP) bins. The top graph is ABP and bottom graph the percentage of time spent at each blood pressure bin. Increasing Mx and COx indicates increasing correlation between blood pressure and the surrogates for cerebral blood flow indicating increasing passivity of flow to pressure. The lower limit of autoregulation in this patient based on an Mx >0.4 is approximately 80 mmHg.