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Introduction: Comorbidities are common among older people, and during the last decade, a strong association between heart failure (HF) and cognitive impairment has been found. As much as 40–50% of individuals with HF will also have some degree of cognitive impairment. Previous studies report an undertreatment for some cardiovascular diseases in patients with major neurocognitive disorder (NCD).

Objective: The aim of this present study was to explore differences in pharmacological treatment of HF in individuals diagnosed with HF with or without comorbidity of major NCD.

Methods: This study combined data from three different Swedish national registers: the Swedish National Patient Register, the Swedish registry for cognitive/dementia disorders (SveDem), and the Swedish Prescribed Drug Register. A logistic regression model including variables for age, sex, major NCD, and nursing home residency was used to analyze associations between drug use and major NCD.

Results: We found a lower prevalence of filled prescriptions of renin-angiotensin system (RAS) inhibitors, β-blockers (BBs), and mineralocorticoid receptor antagonists (MRAs) among patients with major NCD. Living in a nursing home was associated with lower prevalence of RAS inhibitors, BBs, digitalis glycosides, and sodium-glucose cotransporter-2 (SGLT2) inhibitors. Females were found to have higher odds of using BBs, loop diuretics and digitalis glycosides, and lower odds of using RAS inhibitors and SGLT2 inhibitors than males.

Conclusion: Our findings indicate that there is possible undertreatment among individuals with HF identified in specialized care with co-occurring major NCD. Major NCD was associated with less filled prescriptions of basal pharmacological treatments such as RAS inhibitors, BBs, and MRAs. Future research needs to not only investigate this relationship further but also focus on reasons for the undertreatment of HF and other comorbidities within this group.