A large retrospective analysis of acute urinary retention and prostate-related surgery in BPH patients treated with 5-alpha reductase inhibitors: dutasteride versus finasteride.

OBJECTIVE: The purpose of this study was to examine the rates of acute urinary retention (AUR) and surgery after initiating 5-alpha reductase inhibitor (5ARI) therapy and to compare the 2 currently available 5ARIs, dutasteride and finasteride, in a real-world, managed care setting. This study constitutes the first direct comparison of therapeutic outcome between a mono 5ARI (finasteride) and a dual 5ARI (dutasteride). METHODS: This is a retrospective descriptive and comparative analysis of the rates of AUR and prostate surgery in patients with benign prostatic hyperplasia (BPH) treated with 5ARI therapy, either dutasteride or finasteride. Data were obtained from the PharMetrics Integrated Medical and Pharmaceutical Database (PIMPD) (Watertown, Mass) during a 6-year period. The PIMPD is a large national healthcare database that represents a total of 85 managed health plans and covers more than 45 million patients. The data analysis included all patients aged 50 years or older diagnosed with BPH who were treated with 5ARIs (dutasteride 0.5 mg/day or finasteride 5 mg/day) for up to 12 months during the 6-year period of January 1, 1999, to March 1, 2005. Patients meeting the selection criteria were evaluated for a total of 12 months with regard to the likelihood of experiencing AUR or prostate-related surgery. RESULTS: After 5 months of 5ARI therapy, the rate of AUR during months 5 to 12 was found to be significantly lower in the dutasteride group compared with the finasteride group (5.3% vs 8.3%). After controlling for background covariates, dutasteride-treated patients were 49.1% less likely to experience AUR than patients treated with finasteride (P = .0207). Patients treated with dutasteride were also less likely to undergo prostate-related surgery, with 1.4% of dutasteride treated patients and 3.4% of patients receiving finasteride undergoing surgery; differences in surgery rates, however, were not statistically significant (P = .0745), even after controlling for background covariates. CONCLUSTION: Although the 2 drugs, dutasteride and finasteride, belong to the same category of 5ARIs, this large retrospective multivariate analysis potentially indicates differences in therapeutic outcomes. In this study, patients treated with dutasteride were less likely to experience AUR and demonstrated a trend toward being less likely to experience surgery than patients treated with finasteride.

Clinical and economic outcomes in patients treated for enlarged prostate.

BACKGROUND: Benign prostatic hyperplasia (BPH), also referred to as enlarged prostate, is a highly prevalent condition in men aged 50 years or older. It is a progressive disease with significant morbidity from complications. OBJECTIVE: The purpose of this study was to assess the likelihood of having acute urinary retention (AUR) and prostate surgery after initiating therapy with an alpha blocker or 5-alpha reductase inhibitor in a real-world setting. STUDY DESIGN: This was a retrospective study of patients who were treated for BPH between January 1, 2003, and November 30, 2003, in a large, national managed care claims database. Outcomes measures of interest included rate of AUR, prostate surgery, and surgical complications. RESULTS: There were 2959 patient records with a diagnosis of BPH who were taking prostate medications in the database. Eighty-nine percent of patients were receiving alpha blocker therapy, whereas 11% of patients were receiving 5-alpha reductase inhibitors. Overall, the 1-year AUR rate was 12.1%, and the prostate surgery rate was 5.8%. Patients who initiated 5-alpha reductase inhibitor therapy only were less likely to have AUR or surgery compared with patients taking alpha blockers, although surgical differences did not reach statistical significance (P = .0576). Overall, the surgical complication rate was 49.4%, and the rate of AUR within 180 days of prostate surgery was 30.6%. Rates of prostate surgery, AUR, and surgical complications all increased with age. CONCLUSION: Patients receiving 5-alpha reductase inhibitor therapy alone were less likely to have AUR compared with patients receiving alpha blockers and tended to be less likely to have surgery (P = .054).

An assessment of the diagnosed prevalence of diseases in men 50 years of age or older.

OBJECTIVE: A lack of focus on certain men's health problems has led to significant morbidity and mortality in aging men. Managed care must begin to focus on the conditions that are most prevalent in this fast-growing population in an effort to improve the quality of care. To assist in achieving this goal, a naturalistic retrospective study assessing the prevalence of the 10 leading disorders in men older than the age of 50 was conducted, with an additional focus on men eligible for Medicare. METHODS: Claims data were obtained from the Integrated Health Care Information Solutions National Managed Care Benchmark database (Waltham, Mass), that includes data from 30 health plans covering more than 25 million lives, and from the Centers for Medicare & Medicaid Services, representing men from a 5% random sample of Medicare-eligible patients. Men older than 50 years of age were included in the study. The prevalence of all diseases was determined in the 2003 calendar year for each population. Prevalence was calculated by dividing the number of diagnosed cases of a disease by the total person-time observations within the 2003 period. RESULTS: The results indicate that cardiovascular (ie, coronary artery disease [CAD], hypertension, and arrhythmias), urological (ie, enlarged prostate and prostate cancer), and musculoskeletal disorders (ie, osteoarthritis and bursitis) comprise 70% of the 10 leading diseases. CAD and hypertension ranked first and second across all age categories, whereas enlarged prostate ranked fourth. In men older than 50, diabetes ranked third, whereas cataracts ranked third in Medicare-eligible men. CONCLUSION: The diseases identified in this study have the potential to cause significant clinical and economic implications when poorly treated or undertreated. Therefore, there is a need to institute early treatment for these conditions before they progress and require more extensive and costly interventions.

Pharmacy cost evaluation of risperidone, olanzapine, and quetiapine for the treatment of schizophrenia in acute care inpatient settings.

OBJECTIVE: This study examines total pharmacy cost and usage patterns of schizophrenic patients in acute mental health inpatient settings for three atypical antipsychotics -- risperidone, olanzapine, and quetiapine. Despite the readily available unit cost information for drugs, actual pharmacy costs may deviate significantly from 'labeled costs'. Recent research findings indicate the need for more robust evaluation of such pharmacy costs. RESEARCH DESIGN AND METHODS: This study used data from non-randomized inpatient retrospective charts from three acute care inpatient mental health facilities. The final pooled sample included 327 patients, of which 120 received risperidone, 153 received olanzapine, and 54 received quetiapine. Medication cost was defined as the average wholesale price (AWP) as listed in the 2001 'Red Book'. Propensity scoring methodology and multinomial regression were employed to reduce treatment selection bias. RESULTS: The observed mean daily antipsychotic drug doses were 4.45 mg (SD 2.44) for risperidone, 14.04 mg (SD 5.55) for olanzapine, and 350.33 mg (SD 228.24) for quetiapine. The corresponding mean daily drug costs were $7.66(SD $4.20) for risperidone, $8.11 (SD $5.29) for quetiapine and, $12.10 (SD $4.79) for olanzepine. Numbers adjusted for treatment selection bias show that the average daily total pharmacy cost of risperidone was $4.35 lower than olanzapine (p < 0.001) and $1.41 lower than quetiapine (p = 0.38). The adjusted average daily pharmacy cost of olanzapine was $4.02 higher than quetiapine (p < 0.001). After statistical adjustment there were no significant differences between study drugs in terms of length of stay or patient functioning. CONCLUSION: This study provides the first US comparison of medication utilization patterns and pharmacy costs for olanzapine, risperidone, and quetiapine administered in acute mental health care inpatient settings. While this study did not estimate the full economic value of the three antipsychotics in these inpatient settings, it demonstrated that the mean daily costs for risperidone were lower than the mean daily costs for olanzapine (p < 0.001) and quetiapine although the later difference was not statistically significant (p = 0.38).

Differential effects of risperidone, olanzapine, clozapine, and conventional antipsychotics on type 2 diabetes: findings from a large health plan database.

BACKGROUND: Case series suggest that some antipsychotics may induce or exacerbate type 2 diabetes. This study measured the association of antipsychotic treatments with diabetes at a population level. METHOD: Claims data for psychosis patients (ICD-CM-9 290.xx-299.xx) within health plans encompassing 2.5 million individuals were analyzed. Patients reporting preexisting type 2 diabetes up to 8 months prior to observation were excluded. The frequency of newly reported type 2 diabetes in untreated patients and among patients treated with antipsychotics from 5 categories (risperidone, olanzapine, clozapine, and high-potency and low-potency conventionals) was compared. Logistic regression models compared the odds of diabetes based on exposure to each of the antipsychotic categories. RESULTS: Based on 12 months of exposure, the odds of type 2 diabetes for risperidone-treated patients (odds ratio = 0.88, 95% CI = 0.372 to 2.070) was not significantly different from that for untreated patients, whereas patients receiving other antipsychotics had a significantly greater risk of diabetes than untreated patients (p < .05): olanzapine, 3.10 (95% CI = 1.620 to 5.934); clozapine, 7.44 (95% CI = 0.603 to 34.751); high-potency conventionals, 2.13 (95% CI = 1.097 to 4.134); and low-potency conventionals, 3.46 (95% CI = 1.522 to 7.785). Older age and greater use of non-antipsychotic psychotropic medications also contributed to risk of type 2 diabetes. Olanzapine also showed significantly higher (p < .01) odds of diabetes associated with increasing dose. CONCLUSION: Consistent with previously published literature, these data suggest that olanzapine, clozapine, and some conventional antipsychotics appear to increase the risk of acquiring or exacerbating type 2 diabetes and that the effect may vary by drug. In contrast to these agents, risperidone was not associated with an increased risk of type 2 diabetes.