Methods
The project was reviewed by the University of Nevada-Reno Institutional Review Board and determined to be a nonresearch quality improvement project. This was a retrospective chart analysis that included patients receiving their first-ever atypical antipsychotic across 8 US Department of Veterans Affairs (VA) medical centers within VISN 21. Clinical patient data, including prescription, vital sign, and laboratory information, were extracted from the VA Corporate Data Warehouse using transact sequential query language.
Veterans were included in the final cohort if they met the following criteria: aged ≥ 18 years at antipsychotic initiation, initiated their first-ever atypical antipsychotic within the VHA between February 2014 and February 2019, continued the antipsychotic for ≥ 1 year, had a medication possession ratio (MPR) > 80%, and had previously established care within VHA as evidenced by having ≥ 1 primary care or outpatient mental health visit in the 6 months prior to initiation. The MPR is defined as the sum of the day’s supply of all dispensed medications in the project time frame divided by the total number of days in the project time frame.
Veterans were excluded if they initiated any other antipsychotic during the first course, had a prior diagnosis of T2DM, had any prior use of antidiabetic medications, or had a hemoglobin A1c (HbA1c) > 6.4 in the year prior to initiation.
The primary outcome was completion of all recommended metabolic monitoring time points in the first year after atypical antipsychotic initiation. The secondary outcome was incidence of T2DM as evidenced by either a HbA1c > 6.4 or diagnosis of T2DM entered into the electronic health record. Baseline monitoring for BP, blood glucose, and lipids were considered complete if a data point was collected between 3 months prior and 1 month after atypical antipsychotic initiation. Baseline monitoring for weight was considered complete if a data point was collected between 3 months prior and 2 weeks after initiation. Follow-up monitoring for BP, blood glucose, and lipids were considered completed if a data point was collected at 3 and 12 months (mean, 1 month). Follow-up monitoring for weight was considered completed if collected at 1, 2, and 3 months (mean, 2 weeks) and at 6, 9, and 12 months (mean, 1 month). Waist circumference data and patient and family history are not collected as capturable data points. Therefore, the authors were unable to include these in the final data extraction.
Results
The final cohort consisted of 1,651 veterans who met the inclusion criteria. Overall, at antipsychotic initiation the cohort had a mean (SD) age of 55 (14.6) years, was largely male (88%), and was considered overweight with a mean (SD) BMI of 29.1 (6.4) (Table 1).
Appropriate BP monitoring was completed most often with 492 patients (30%) meeting ADA/APA recommendations followed by HbA1c and/or blood glucose monitoring with 203 patients (12%) completing all time points. Recommended lipid monitoring was completed by 96 patients (6%). Weight monitoring was completed least often with 47 patients (3%) completing all recommended time points. Regarding completion of all metabolic monitoring time points, 3 (0.2%) patients in the final cohort were found to have completed all recommended monitoring. Ninety-nine patients (6%) were found to have progressed to T2DM as indicated by an HbA1c > 6.4 and/or entry of a T2DM ninth or tenth edition International Statistical Classification of Diseases code into the chart (Table 2).