Clinical Investigation
Social Network as a Predictor of Hospital Readmission and Mortality Among Older Patients With Heart Failure

https://doi.org/10.1016/j.cardfail.2006.06.471Get rights and content

Abstract

Background

This study examines the relationship between social network and hospital readmission and mortality in older patients with heart failure.

Methods and Results

Prospective study conducted with 371 patients, age 65 and older, admitted for heart failure–related emergencies at 4 Spanish hospitals. Social network was measured at baseline with a 4-item questionnaire that ascertained whether subjects were married, lived with another person(s), saw or had telephone contact with family members daily or almost daily, and were at home alone for less than 2 hours per day. Social network was deemed “high” where all 4 items were present, “moderate” where 3 were present, and “low” where 2 or fewer were present. Analyses were performed using Cox models, and adjusted for the main confounders. A total of 55% of patients had high or moderate social networks. During a median follow-up of 6.5 months, 135 (36.4%) patients underwent a first emergency rehospitalization and 68 (18.3%) died. Compared with patients with high social network, hospital readmission was more frequent among those who had moderate (hazard ratio [HR] 1.87; 95% confidence interval [CI] 1.06–3.29; P < .05) and low social networks (HR 1.98; 95% CI 1.07–3.68; P < .05). This relationship showed a positive dose-response (p for linear trend 0.042). The magnitude of this association was comparable to that of other important predictors of readmission, such as previous hospitalization. No relationship was observed between social network and death.

Conclusion

A very simple questionnaire measuring social network can identify patients with a higher short-term risk of hospital readmission.

Section snippets

Study Design and Subjects

A prospective study was conducted on 433 patients admitted for HF-related emergencies at 4 Spanish hospitals. The study included patients of both sexes age 65 years and older, with diagnosis (principal or secondary) of suspected HF. Suspected diagnosis was made in cases where patients simultaneously presented with the following symptoms and signs:9 complaint of shortness of breath or fatigue; and alveolar edema, interstitial edema, or signs of pulmonary vascular redistribution on emergency

Study Sample

Of the 433 patients enrolled, information on 1 or more of the baseline variables was lacking in 23 subjects. In addition, 39 (9%) subjects were lost to follow-up of hospital readmission and 24 (5.5%) to follow-up of mortality. Consequently, final analyses were performed on 371 (85.7%) patients for whom there was complete information. The characteristics of the study subjects are presented in Table 1.

Median follow-up of patients was 6.4 months for hospital readmission and 6.6 months for death.

Discussion

Our results show that the greater the degree of social isolation, the higher the frequency of hospital readmission in patients with HF. The influence of a low social network on hospital readmission is comparable to that exerted by other important biomedical factors, and is not explained by a good number of biomedical and psychosocial variables. However, no relationship was observed between social network and mortality in HF patients.

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    Supported by FIS grant 00/0035, by an unrestricted educational contract with Lilly Pharmaceuticals, Spain, and by ISCIII (network C03/09 and network G03/065). The sponsors had no role in study concept and design, subject recruitment, acquisition of data, data analysis, writing of the manuscript, or in the decision to submit the article for publication.

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