PMC5818770_01
Preoperative single-photon emission computed tomography scan. A preoperative single-photon emission computed tomography scan taken at the regional medical center revealed reduced cerebral blood flow in the left cerebral hemisphere (especially in the external left frontal cortex)
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Fig1
Preoperative single-photon emission computed tomography revealed reduced cerebral blood flow in the left cerebral hemisphere (especially in the external left frontal cortex; Fig. 1).
Intraoperative regional cerebral oxygen saturation measured by INVOS  and bispectral index. rSO2, regional cerebral oxygen saturation; BIS, bispectral index; CPB, cardiopulmonary bypass; IABP, intra-aortic balloon pumping
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Fig2
Before CPB, rSO2 values were almost above 80 % on both sides (Fig. 2).  The rSO2 values were almost above 75 % on both sides and not below the awake rSO2 values (Fig. 2).
Postoperative single-photon emission computed tomography (SPECT) scan. The postoperative SPECT scan obtained from our hospital revealed that low cerebral blood flow lesions in the left cerebral hemisphere had not changed compared to the preoperative SPECT scan
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Fig3
On the 15th POD, single-photon emission computed tomography revealed that the low cerebral blood flow lesions had not changed (Fig. 3), and the patient was discharged from our hospital on the 16th POD.