Anti-inflammatory treatment and risk of depression in 91,842 patients with acute coronary syndrome and 91,860 individuals without acute coronary syndrome in Denmark.

We examined if treatment with acetylsalicylic acid (ASA), non-steroid anti-inflammatory drugs (NSAID), or statins after acute coronary syndrome (ACS) are associated with decreased risk of depression.This register-based cohort study included all individuals with a first-time hospital admissions with an ACS diagnosis registered between January 2001 to December 2009 (N=91,842) and a comparable reference population without ACS (N=91,860). Information of ASA, NSAID, and statin use were retrieved from a national prescription register. The study population was followed for hospitalization with depression or receiving prescription of antidepressant medication for up to one year after ACS or study entry (early depression) or one to twelve years after ACS or study entry (late depression).ASA use after ACS was associated with decreased risk of early depression with hazard ratios (HR) of 0.89 (95% confidence interval 0.85-0.93) but not with late depression 0.96 (0.90-1.01). The corresponding HRs for statin were 0.90 (0.86-0.94) and 0.86 (0.82-0.90). In the non-ACS population, statin use was not associated with neither early nor late depression (HRs 1.04 (0.96-1.12) and 1.00 (0.95-1.06)), while ASA was associated with increased risk of late (HR 1.09 (1.04-1.14)) but not early depression (HR 1.03 (0.97-1.09)). In both populations, NSAID use was associated with increased risk of late but not early depression.Use of ASA or statins were associated with decreased risk of depression in ACS patients but not in individuals without ACS, while use of NSAID was associated with increased risk of late depression in both populations.