The Perfusion Index May be an Accurate Tool for Predicting the Progression of Ischemia in Patients with Peripheral Arterial Disease

< .001; negative predictive value: 98%). Logistic regression analysis revealed that PIave < .27 was significantly associated with disease progression. In conclusion, the PI is a simple and useful marker for accurately indicating the degree of ischemia in the toes. The PI can predict that a patient will not progress to CLTI in the next 3 months with conservative treatment and may contribute to safe follow-up.