David Brill
An updated treatment algorithm has been released which promises to help guide primary care physicians through the ever-expanding field of treatments for type 2 diabetes.
The consensus statement, produced jointly by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD), places a strong emphasis on early treatment and the maintenance of HbA1c levels below 7 percent.
Metformin therapy plus lifestyle intervention is recommended from diagnosis for all patients, with further medications to be added promptly if targets are not achieved.
The statement also makes new differentiations within drug class
– advocating pioglitazone over rosiglitazone and dropping glybenclamide and chlorpropamide from the list of recommended sulfonylureas.
"We’ve seen absolutely that if you do not keep glucose levels within reasonable bounds you will reap a harvest of microvascular disease," said Professor Rury Holman, one of the authors of the algorithm.
"The tide is changing. The view that complications are inevitable is no longer true. They will occur even in the best controlled-people but the risk can be substantially reduced, and therefore I think we have a duty of care to minimize HbA1c to the extent that we can," he said.
Holman, head of the Diabetes Trials Unit at The Oxford Centre for Diabetes, Endocrinology and Metabolism, UK, said that the new algorithm is "not a prescription" to be followed in all cases but rather an evidence-based starting point for primary care doctors, who should still seek specialist advice where appropriate.
He also stressed the need to adopt a more cautious approach to HbA1c lowering in patients with a long-standing history of disease, noting that physicians should weigh up the relative risks and benefits before attempting to push HbA1c levels below 7 percent.
The latest version of the ADA/ EASD treatment algorithm, first issued in 2006, was published online recently in the journals Diabetes Care and Diabetologia. The document will continue to be updated as and when new data become available, Holman said.
For cases where the initial metformin approach is unsuccessful, the algorithm divides the subsequent intensification of therapy into two tiers according to how well validated the medications are considered to be. Tier 1 sees the addition of either sulfonylurea or basal insulin, progressing to initiation or intensification of insulin therapy. Tier 2 recommends pioglitazone or the glucagon-like peptide-1 agonist exenatide, before moving on to sulfonylurea or basal insulin.
Besides the algorithm, the consensus statement also contains a literature review on the relative merits of the different medications, and guidance on the titration of metformin and the initiation and adjustment of insulin regimens.
Dr. Kevin Tan, vice president of the Diabetic Society of Singapore, agreed that doctors now have a duty to initiate early, intensive glycemic control and said that incorporating the new algorithm would help them to focus on the older, better-established drugs and view the newer options as alternatives to be used where necessary.
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