We conducted a prospective cohort study focusing on patients admitted to the MICU with the main diagnosis of sepsis. The ankle-brachial indexes are performed within 24 hours after admission. Invasive arterial line monitoring and standard non-invasive measurements are collected. After confirmation of PAD, standard anti-platelet treatments (aspirin and cilostazol) are initiated. The survival before and after the conduction of this trial is compared to historical records. The outcomes including all-cause mortality, stroke, myocardial infarction, minor amputation, major amputation, and prolonged ventilator dependent are to be collected.