Patients with borderline personality disorder (BPD) are known to present frequently in emergency rooms, and they have a high rate of suicide. The mortality rate of patients with BPD is still unclear. The Danish Psychiatric Central Research Register and The Danish Register for Causes of Death were used to identify patients with a first-ever diagnosis of BPD (ICD-10: F60.31) from 1995 through 2011 together with time and cause of death. A total of 10,545 patients with a BPD diagnosis were followed for a mean time of 7.98 years. A total of 547 deaths were registered. The standardized mortality ratio of patients with BPD compared to the general population was 8.3 (95% CI [7.6, 9.1]). More than three inpatient admissions per year or a comorbid diagnosis of substance use disorder correlated with a higher mortality rate. The increased mortality rate in patients with BPD treated in secondary care emphasizes that it is a severe mental disorder.
Keywords: borderline personality disorder; epidemiology; mortality; schizophrenia; substance use disorder; suicide.