CTSD and Sepsis: As shown in Figure 2 and Table 2, the sepsis group had significantly higher levels of free Hb (15.27 vs. 9.75 mg/dL; p < 0.001), cathepsin D (849.19 vs. 337.44 ng/mL; p < 0.001), and LVV-H7 (371.68 vs. 194.48 ng/mL; p < 0.001) than the non-sepsis group.