Identifying targets to improve treatment in type 2 diabetes; the Groningen Initiative to aNalyse Type 2 diabetes Treatment (GIANTT) observational study

Purpose Assessment of quality of cardiometabolic risk management in diabetes in primary care. Methods In a descriptive cohort study including 95 Dutch general practices, we assessed medication treatment in relation to the level of control for HbAlc, systolic blood pressure (SBP) and LDL-cholesterol (LDL-c) in 2007. We also applied a prospective measure of treatment quality by assessing treatment modifications in not well-controlled patients. In a subpopulation of 23 practices, we studied trends in these quality indicators from 2004 (2059 patients) to 2007 (2929 patients). Results In 2007, averages for HbAlc, SBP and LDL-c were 6.9%, 142 mmHg and 2.3 mmol/l, respectively. Of the patients with an HbAlc >8.5%, 16% were treated with one oral drug class and 50% used insulin. In 27% of these patients, therapy modification occurred subsequently. During the 4-year period, a slight decrease in average HbAlc was observed, but no changes in treatment level. In 2007, 56% of the patients had an SBP >= 140 mmHg, 19% of whom were not using antihypertensives. In the 13% with an SBP >160 mmHg, 23% received a therapy modification. During the 4-year period, the average SBP decreased with 6 mmHg but the treatment level showed no substantial increase. In 2007, 39% had an LDL-c level >= 2.5 mmol/l, 49% of whom were not using statins. Of the patients with an LDL-c >3.5 mmol/l, only 9% received a therapy modification. Conclusions The decreasing population averages of HbAlc, SBP and LDL-c values suggest improvement in quality of care. However, the relatively few therapy modifications observed in insufficiently controlled patients show room for improvement. Copyright (C) 2010 John Wiley & Sons, Ltd