Interventions
Anxiety
ADVERSE EVENTS
Intervention group: The checklist-based nursing care process was used to provide care and education to patients with CTO before and after PCI, and the specific contents and methods are as follows. A paper version of the checklist-based nursing process required for the study was also printed. After the patient with CTO is admitted to the hospital, the primary nurse will create a checklist for him/her, fill in the complete patient information, and manage the admitted patient according to the checklist item by item, that is, tick “√” at “yes” for completed tasks and “√” at “no” for those that are not completed. If the patient fails to complete this item during the implementation process, tick “√” at “not applicable,” and the checklist will be kept for statistical purposes after the patient is discharged from the hospital. Within 24 h of admission, the primary nurse will score the patient based on the Self-Rating Anxiety Scale (SAS) and provide nursing care to the patient following the “Preoperative Nursing Care Checklist for Patients with CTO.”Nurses need to be trained on intervention prior to intervention.All contents of the preoperative nursing care checklist for patients with CTO should be completed 1 day before surgery to 1 h before surgery (Fig. 
Preoperative-PCI nursing care checklist for CTO patients
Postoperative-PCI nursing care checklist for CTO patientsControl group: Nursing care process for patients with CTO was carried out according to existing working methods, clinical observation, and health education. That is, nurses performed preoperative preparation and provided postoperative nursing care according to medical advice and personal work habits after patients were admitted to the hospital, placed intravenous indwelling needles one day or on the same day before surgery, performed skin preparation in the operating area, and provided preoperative diet, medication, and psychological guidance. The time required to complete all preoperative nursing tasks was recorded. The patient’s clinical observation, wound care, postoperative education, diet instruction, medication, and psychological guidance were conducted regularly according to the doctor’s postoperative advice. The preoperative and postoperativeSASscoring was performed within 24 h of admission and before discharge, respectively. The doctor satisfaction survey was conducted after surgery. The patient satisfaction survey was performed before discharge, and the occurrence of adverse events was recorded.Quality control: [