Patients with unclosed arterial ducts should pay attention to the following after receiving the intervention: First, it is to observe the color of the patient’s urine, because after the implantation of the blocker, the local blood flow is relatively fast and many patients can develop hemolysis. The so-called hemolysis is the destruction of red blood cells, so the color of urine may appear soy sauce-like at this time. If abnormalities of urine are found, they should be reported to the doctor as soon as possible. Second, it is to observe whether there is a relatively large hematoma at the leg vascular puncture site, if there is, it should also be treated as early as possible, as it may form a pseudoventricular tumor later, which will be troublesome. Third, it is to observe whether there is bleeding under the skin, if there is bleeding, there may be a combination of thrombocytopenia, and postoperative platelet destruction can also occur, such patients should actively do platelet therapy. This is the most important precautions after arterial catheter intervention.