Background
Both heart failure (HF) symptoms and self-care are associated with patient outcomes. Although it is thought that symptoms drive self-care, there is limited evidence to support this assumption over time.
Aims
Determine whether patterns of physical symptoms are significantly associated with HF self-care over time.
Method
Latent mixture analysis was used to identify sub-groups based on physical symptoms of dyspnea, sleepiness and edema (using the HF Somatic Perception and Epworth Sleepiness Scales). Growth modeling was used to determine if symptom sub-groups were associated with self-care behaviors (using the Self-care in HF Index) over 6 months. Socio-demographic and clinical variables predicting likelihood of sub-group membership were identified using logistic regression.
Results
The sample (n=146) was on average 57 years old, 70% were men and 59% had class III/IV HF. Two symptom sub-groups were identified (entropy=0.91); a high symptom group (n=24(16%)) with no significant change in symptoms over time (high sustained), and low symptom group (n=122(84%)) with no significant change in symptoms over time (low sustained). The high sustained group was associated significantly with better self-care behaviors at baseline and over 6 months. Women (OR=3.67, p=0.023) and patients with more depressive symptoms (OR=1.16, p=0.015) were more likely to be in the high sustained symptom group. Those treated with a renin-angiotensin-aldosterone system agent were less likely to be in the high symptom group (OR=0.17, p=0.015).
Conclusion
Patients bothered more by symptoms are consistently more engaged in self-care behaviors over time. Results of this study support symptoms as an important driver of self-care behaviors.