Frequency of suicide on Gotland after systematic postgraduate education of general practitioners

In 1983–1984 the Swedish Committee for Prevention and Treatment of Depression (PTD Committee) introduced an educational program for all general practitioners (GPs) on the Swedish island of Gotland. The primary goal was to increase knowledge about diagnosis and treatment of patients with affective disorders. The effects of the educational programs were evaluated in detail; GPs identified more patients with depressive disorders and treated them more accurately. The suicide rate on Gotland was followed, primarily to ensure that the new treatment strategies did not include a risk for the individual patients. However, it was also hoped that increased awareness of patients with affective disorders and better treatment routines could reduce the suicide rale. The suicide rate dropped the year after the educational programs were introduced. This was a statistically significant deviation both from the long-term trend on Gotland and from the trends in Sweden as a whole. Programs aiming at giving GPs increased capacity and responsibility to treat patients with affective disorders do not increase the frequency of suicide. Better primary treatment of patients with depressive disorders may reduce the suicide rate in a given area.     

Trends in use of antidepressants, lithium, and anticonvulsants in Kaiser Permanente-insured youths, 1994-2003

In view of the current controversy regarding the use of antidepressants in children and adolescents, we examined trends from 1994 to 2003 in the use of antidepressants, lithium, and anticonvulsants by enrollees, aged 5-17 years, of Kaiser Permanente in Northern California. We found that the use of antidepressants more than doubled from 9.4 per 1000 enrollees to 21.3 per 1000. Most of this increase is associated with selective serotonin reuptake inhibitors (SSRIs), which increased from 4.6 to 14.5 per 1000. The use of tricyclic antidepressants (TCAs) decreased markedly, while the increase of other newer antidepressants rose from 1.3 to 6.5 per 1000. The use of anticonvulsants nearly doubled, from 3.5 to 6.9 per 1000, while lithium use was relatively stable at a rate of nearly 1 per 1000. Use of SSRIs, newer antidepressants, and anticonvulsants increased in boys as well as girls in each of three age groups: 5-9, 10-14, and 15-17 years. An increasing percentage of the antidepressant users had a diagnosis of depression, and an increasing percentage of anticonvulsant users had a diagnosis of bipolar disorder. Although the safety and efficacy of antidepressants in youths needs to be more firmly established, these findings may reflect progress in the diagnosis and treatment of mental illness.     

Drug-drug interactions as a determinant of elevated lithium serum levels in daily clinical practice

OBJECTIVE: Lithium is a drug with a narrow therapeutic window. Concomitantly used medication is a potentially influencing factor of lithium serum concentrations. We conducted a multicentre retrospective case-control study with the aim of investigating lithium-related drug interactions as determinants of elevated lithium serum levels in daily clinical practice. METHODS: Cases were patients with an increase of at least 50% in lithium serum concentrations resulting in an elevated lithium serum level of at least 1.3 mmol/L, and who were not suspected of a suicide attempt. Controls were patients who showed stable lithium serum levels within the therapeutic range. Use and start of non-steroidal anti-inflammatory drugs, diuretics, renin-angiotensin inhibitors, theophyllin and antibiotics were investigated as potential determinants of the elevated lithium serum levels. Irregularity in lithium dispensing pattern, change in lithium dosing regimen, age, gender, prescribing physician and laboratory parameters were investigated as potential confounders. RESULTS: We included 51 cases and 51 controls in our study. Five (9.8%) controls and 15 (29.4%) cases used potentially interacting co-medication [OR of 3.83 (95%CI 1.28-11.48)]. Start of potentially interacting co-medication was observed in eight (15.7%) cases and in zero (0%) controls resulting in an OR of 20.13 (95% CI 1.13-359). After adjustment for co-medication, irregularity in lithium dispensing pattern, change in lithium dosing regimen, and age, the statistically significant association was lost. We report an OR of 2.70 (95% CI 0.78-9.31) for use of concomitant medication, with a large contribution of antibiotic agents, and an OR of 3.14 (95% CI 1.15-8.61) for irregularity in lithium dispensing pattern. CONCLUSION: Use of co-medication, especially antibiotics, tends to be associated with elevated lithium serum levels.