Depressive and anxiety symptoms, defense mechanisms, and mentalized affectivity in individuals with myocardial infarction: an empirical investigation

Myocardial infarction (MI) is associated with emotional distress, depression, and anxiety. Defense mechanisms and mentalized affectivity play key roles in affective regulation; however, their roles in individuals with MI remain underexplored. This study examined the relationship between depressive and anxiety symptoms, defensive functioning, and mentalized affectivity in MI patients. Sixty-seven patients with MI and 80 healthy controls completed the DSM-5 Self-Rated Level 2 Cross-Cutting Symptom Measures—Depression and Anxiety—Adult, the Defense Mechanisms Rating Scales-Self-Report-30, and the Brief-Mentalized Affectivity Scale. Multivariate analyses were used to compare the MI and healthy groups, while correlations and mediation models were used to evaluate associations between variables within the MI group. Compared to controls, patients with MI exhibited more severe depressive and anxiety symptoms, maladaptive defenses, and lower levels of mentalized affectivity. Within the MI group, the severity of depressive and anxiety symptoms was associated with immature defensive functioning and poorer abilities to regulate affects. Notably, the relationship between worse defensive functioning and severe depressive and anxiety symptoms was mediated by the capacity to process emotions. The mediating role of this specific dimension of mentalized affectivity emphasizes the potential of affect regulation as a target for tailored psychosocial interventions aimed at improving clinical outcomes.