PTA in clinical terms refers on the one hand to percutaneous transluminal angioplasty. It refers to atherosclerosis that is dilated and recanalized by devices such as catheters, or other causes of vascular stenosis or occlusive lesions. Specific treatment modalities include balloon angioplasty, laser angioplasty, atheromatous plaque resection, and vascular self-supporters. It is clinically indicated for the treatment of peripheral limb arteries, renal arteries, and coronary artery stenoses in the heart, and can also be used to treat arteriovenous fistulas. On the other hand, it refers to prothrombin activity, the normal range of which is 75%-100%. Prothrombin activity reflects the coagulation function of the liver and also the reserve function of the liver, and is closely related to the severity of the disease. Patients with acute and chronic hepatitis, severe hepatitis, and biliary obstruction are prone to a decrease in prothrombin activity. The exact clinical significance of the condition also needs to be determined on a case-by-case basis.