Device and method for assessing sternal compression

An evaluation apparatus for chest compression, comprising:

• a measuring unit configured to obtain numerical values relating to temporal changes in a total hemoglobin concentration, an oxygenated hemoglobin concentration, and a deoxygenated hemoglobin concentration in a head, which vary due to repetition of the chest compression;
• a compression position evaluation unit configured to calculate a first indicator and a second indicator based on the numerical values and determine whether a compression position on a sternum is appropriate based on the first indicator and the second indicator, the first indicator relating to a temporal change ratio of one or both of the oxygenated hemoglobin concentration and the deoxygenated hemoglobin concentration with respect to a temporal change in the total hemoglobin concentration, and the second indicator relating to a correlation between a temporal change in the oxygenated hemoglobin concentration and a temporal change in the deoxygenated hemoglobin concentration;
• and
• an instruction unit configured to instruct to change the compression position in a case where the compression position on the sternum is inappropriate,
• wherein the measuring unit includes:
• a light incidence portion configured to make measurement light incident on the head;
• a light detection portion configured to detect the measurement light that has propagated through the head and generate a detection signal corresponding to an intensity of the measurement light;
• and
• a calculation portion configured to calculate the numerical values based on the detection signal.