The intervention group received a nurse-led, multidisciplinary program via the Cardiovascular Home Care APP, in addition to conventional follow-up care. Team: 4 physicians, 4 nurses, and APP use.

1.Pre-discharge APP training: daily tasks, report upload, online consultation. APP automatically linked to patient information upon discharge.2.Nurse-created plans: medication schedules, self-monitoring (BP/heart rate/weight/symptoms), follow-up appointments, with reminders.3.Regular tailored education via APP (trigger avoidance, risk control, sodium/fluid restriction, symptom recognition, exercise).4.Daily nurse monitoring via backend. Alerts (non-adherence ≥7 days; BP fluctuation >20%; medication intolerance; weight gain >2kg/3 days; volume overload symptoms) triggered nurse contact and multidisciplinary discussion for treatment adjustments.5.Structured telephone follow-up at week 1; additional calls as needed.6.Dynamic plan updates during clinic visits.

The SCHFI consists of three subscales: (1) Self-Care Maintenance (10 items), which assesses treatment adherence and symptom monitoring using a 4-point Likert scale (1-4); (2) Self-Care Management (6 items), which evaluates symptom recognition (one item, 5-point Likert scale 0-4), symptom management (four items, 4-point Likert scale 1-4), and evaluation of management strategies (one item, 5-point Likert scale 0-4); and (3) Self-Care Confidence (6 items), which measures confidence in maintaining self-care (two items) and managing symptoms (four items) using a 4-point Likert scale (1-4). Each subscale is converted to a standardized score ranging from 0 to 100 using the formula: [(raw score - minimum score) / (maximum score - minimum score)] × 100. The total score is the sum of the three subscale scores (range 0-300), with higher scores indicating better self-care. The Chinese version has demonstrated good reliability, with Cronbach's α coefficients ranging from 0.656 to 0.869 for the sub

This 32-item instrument evaluates symptoms across three subscales: physical symptoms, psychological symptoms, and heart failure-specific symptoms. For each symptom, four dimensions are assessed: presence, frequency (1-4 point Likert scale), severity (1-4 point Likert scale), and distress (0-4 point Likert scale). If a symptom is not present, it is scored as "0". The total symptom score is calculated as the mean of all symptom scores, with higher scores indicating greater symptom burden. The Chinese version has shown excellent reliability, with Cronbach's α coefficients ranging from 0.807 to 0.946 for the total scale and subscales.