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Roles of cerebral metabolic rate for oxygen in evaluating the prognosis of cerebral function after cardiopulmonary resuscitation

Objective 
To investigate the roles of cerebral metabolic rate for oxygen (CMRO2) monitoring in the evaluation of cerebral function after cardiopulmonary resuscitation (CPR) through transcranial doppler (TCD) and SjvO2. 
 
 
Methods 
In this prospective/retrospective analysis, we included 46 cases admitted to the general intensive care unit (GICU) of the Second Affiliated Hospital of Soochow University from January 2012 to December 2014. Upon admission, TCD and SjvO2 were performed, and the patients’ characteristics were recorded. Based on the CPC score upon GICU discharge, the patients were divided into two groups with satisfactory cerebral function and poor cerebral function, respectively. Then the clinical symptoms, cerebral blood flow (CBF), a-vDO2, SjvO2 and CMRO2 were analyzed, followed by investigating their correlation with the prognosis of cerebral function. The measurement data that were normally distributed were presented by mean ± standard deviation. Student’s t test was utilized for the inter-group comparison. Correlation analysis was performed. ROC was plotted, followed by evaluating roles of each index in the specificity and sensitivity of nervous prognosis. 
 
 
Results 
No statistical differences were noted in the gender, age, initial monitoring indicators, ICU duration and initial GCS between the two groups (P>0.05). The CA-ROSC time and APACHE II score in the satisfactory cerebral function group were significantly shorter than those of the poor cerebral function group (P<0.05). The SjvO2 in the satisfactory cerebral function group was significantly lower than that of the poor function group (67.33±10.30 vs. 76.89±13.08, t=-3.579, P<0.05). The Vs and Vd as revealed by TCD in the satisfactory function group were higher than those of the poor function group, together with the CBF. Significant decrease was noted in the PI and RI in the satisfactory function group compared with that of the poor function group (P<0.05). Besides, the CMRO2 and a-vDO2 in the satisfactory function group showed significant increase compared with those of the poor function group (P<0.05). ROC indicated that CMRO2, CBF, a-vDO2 and SjvO2 could be utilized for the evaluation of cerebral function, among which CMRO2 showed the highest accuracy for the cerebral function prognosis. 
 
 
Conclusions 
CMRO2, CBF, a-vDO2 and SjvO2 were associated with cerebral function prognosis. CMRO2 was the most appropriate parameter to evaluate the oxygen metabolism in brain tissues, which could evaluate the prognosis of cerebral function. 
 
 
Key words: 
Cardiac arrest; Resuscitation; Jugular venous oxygen saturation; Transcranial Doppler; Cerebral metabolic rate for oxygen