Regional inequalities in heart failure hospitalisation and in-hospital mortality in Spain (2016–2022): a nationwide, observational study

Background: Heart failure remains one of the leading causes of hospital admissions and mortality worldwide, with substantial regional disparities in clinical outcomes. These variations have been linked to differences in socioeconomic conditions, health determinants, and health-care system organisation. The aim of this study was to analyse regional differences in hospitalisation rates and in-hospital mortality for heart failure across Spain's autonomous communities, and to examine their associations with hospital characteristics and regional health determinants. Methods: We conducted a nationwide, retrospective, population-based study using Spain's national hospital discharge database (Conjunto Mínimo Básico de Datos, CMBD) to identify adults (≥18 years) discharged from public general hospitals within the Spanish National Health System (SNS) with a primary diagnosis of heart failure from January 1, 2016, to December 31, 2022. Differences in hospitalisation rates and risk-standardised in-hospital mortality between autonomous communities were analysed, along with associations with hospital characteristics and regional health determinants. Findings: = -0.77; 95% CI: -1.04 to -0.49; p < 0.001; R2 = 0.77). Interpretation: Significant regional differences in hospitalisation rates and risk-standardised mortality rates were observed among patients hospitalised for heart failure. Regional disparities in gross domestic product per capita may partly explain these differences. These results have clinical and policy implications, underscoring the need to consider socioeconomic determinants when analysing health outcomes and designing public policies aimed at reducing health inequalities. Our findings might be relevant to other European countries with similar public health systems. Funding: This work was supported by the Spanish Society of Cardiology (Sociedad Española de Cardiología, SEC).