Figure 4.

Receiver operating characteristic curves comparing MOx values and shock index values measured in healthy control subjects and trauma patients. Based on measurements of heart rate, systolic blood pressure, and lactate made within an hour of spectral acquisition, patients were categorized into shock severity groups of mild, moderate, and severe (Table 1). A) When all trauma patients were included in the test group (mild, moderate, and severe shock groups = ‘All Shock’), MOx identified the presence of shock well, with an area under the curve (AUC) of 0.857. MOx identified shock in the severe and moderate groups very well, and had considerable success with the identification of mild shock. B) The ability of shock index to identify shock in general (‘All Shock’) was comparable to that of MOx. Shock index successfully identified severe and moderate shock, but was not as successful as MOx at identifying mild shock.