Algorithm for the treatment of type 2 diabetes: a position statement of Brazilian Diabetes Society
© Lerario et al; licensee BioMed Central Ltd. 2010
Received: 14 December 2009
Accepted: 8 June 2010
Published: 8 June 2010
The Brazilian Diabetes Society is starting an innovative project of quantitative assessment of medical arguments of and implementing a new way of elaborating SBD Position Statements. The final aim of this particular project is to propose a new Brazilian algorithm for the treatment of type 2 diabetes, based on the opinions of endocrinologists surveyed from a poll conducted on the Brazilian Diabetes Society website regarding the latest algorithm proposed by American Diabetes Association /European Association for the Study of Diabetes, published in January 2009.
An additional source used, as a basis for the new algorithm, was to assess the acceptability of controversial arguments published in international literature, through a panel of renowned Brazilian specialists. Thirty controversial arguments in diabetes have been selected with their respective references, where each argument was assessed and scored according to its acceptability level and personal conviction of each member of the evaluation panel.
This methodology was adapted using a similar approach to the one adopted in the recent position statement by the American College of Cardiology on coronary revascularization, of which not only cardiologists took part, but also specialists of other related areas.
Summary of Brazilian Diabets Society Members Opinions on the New ADA/EASD Algorithm
Considering the great controversy raised by the recommendations at the recent ADA/EASD algorithm, the Brazilian Diabetes Society (BDS) decided to evaluate the opinions of its members, through a survey conducted on the BDS' website during ten days, in November 2008 [1, 2]. Two hundred and seventeen associates (endocrinologists) completed this survey.
Percentuals of answers to the proposed questions
1. Have you read the Treatment of Type 2 Diabetes algorithm proposed by ADA/EASD?
2. Were you aware that the document expresses the opinion of a few authors and not of the entities involved?
3. Do you intend to adopt the stages and steps suggested by this algorithm in your practice?
4. Do you think that rosiglitazone-associated adverse events have been ratified in the medical literature of excellence?
5. Do you think that the cardiovascular protection assigned topioglitazone in that Position Statement is real?
6. Do you think that glitazone-associated adverse events (bone fracture and cardiovascular events) are effects pertaining to this therapeutical class?
7. Do you think that only GLP-1 analogs should be included in diabetes treatment excluding DPP-4 inhibitors?
8. Do you think that BDS' members have the expertise and the ability of criticism to issue a Position Statement about this Algorithm?
General conclusions about the survey results
The results showed that the majority of the brazilian endocrinologists do not agree with the guidelines proposed by the ADA/EASD algorithm regarding the use of glitazone, GLP-1 analogs and DPP-IV inhibitors in the treatment of Type 2 Diabetes.
Considering the need for an algorithm reflecting the opinion of Brazilian endocrinologists, the Brazilian Diabetes Society decided to develop this position statement, whose recommendations shall be dictated by the technical panel assessments, named by the entity and also by the results obtained from the survey.
Results of the controversial diabetes argument acceptability assessment
In addition to the feedback from associates obtained through the survey and in order to provide a more robust basis to the algorithm proposed for the treatment of type 2 diabetes, the Brazilian Diabetes Society obtained the opinions of a panel formed by renowned Brazilian specialists regarding recommendations, guidelines and controversial arguments on the treatment of type 2 diabetes in international literature.
Thirty controversial arguments were individually assessed and scored on a 10-point scale by the evaluation panel members, who assigned individual scores (0-10) to the 30 arguments presented, which were made into 5 acceptability levels (1-5).
Interpretation of acceptability levels of arguments based on individual scores
0 - 2
3 - 4
5 - 6
7 - 8
9 - 10
Average acceptability level of controversial matters assessed and their respective bibliographical references
Table S1, Additional file 1 shows the relation between controversial matters assessed and their respective bibliographical references and the average level of acceptability for each controversial matter, following the calculation methodology as defined in the previous item.
New SBD algorithm proposal for the treatment of type 2 diabetes
Laboratory goals for characterization of good glycemic control
Laboratory targets for proper T2DM treatment
Glycated hemoglobin (A1C)
<7% (in adults)
7.5-8.5%: 0-6 years old1;
<8%: 6-12 years old1;
<7.5%: 13-19 years old1;
8%: in the elderly1,3
Up to 130 mg/dL2
Up to 130 mg/dL2
Up to 180 mg/dL2
New SBD algorithm proposal for treating type 2 diabetes
Algorithm for the treatment of type 2 diabetes - 2009 update -
STAGE 1: INITIAL CONDUCT ACCORDING TO CURRENT CLINICAL CONDITION
Hospitalization if glycemic levels >300 mg/dL
• Glycemic levels <200 mg/dL
• Mild symptoms or no symptoms
• Absence of other acute concomitant diseases
• Any glycemic levels between 200-300 mg/dL
• Absence of criteria for mild or severe manifestations
• Any glycemic levels above 300 mg/dL
= Or =
• Significant weight loss
= Or =
• Severe and significant symptoms
= Or =
• Presence of ketonuria
Under the following conditions:
• Diabetic ketoacidosis and hyperosmolar state
= Or =
• Intercurrent severe disease or comorbidity
Metformin (500 mg/day, intensifying up to 2,000 mg/day) + lifestyle changes.
If patient does not reach A1C<7%
in 4-6 weeks →
Note: In case of metformin intolerance, prolonged action formulations may be useful. If the problem persists, choose one of the options in Step 2
Metformin (500 mg/day, intensifying up to
2,000 mg/day) +
lifestyle changes + other oral antidiabetic drugs
CRITERIA FOR INCLUDING SECOND OAD
Start insulin therapy immediately
Start therapy according to the algorithm recommendations and to glycemic control obtained after discharge from hospital
STAGE 2: ADD OR MODIFY SECOND AGENT ACCORDING TO A1C LEVEL(*)
Glinides (prevalent post-prandial hyperglycemia)
Acarbose (prevalent post-prandial hyperglycemia)
Exenatide (overweight or obesity)
Basal insulin (bedtime)
Exenatide (overweight or obesity)
Basal insulin + prandial insulin
With of without
iDPP-4 (studies currently being made)
(*) In order to select the second agent, we suggest looking at therapeutic drug profiles in table 7.
MONITORING AND ADJUSTMENTS IN TREATMENT AFTER 2-3 MONTHS WITH MAXIMUM EFFECTIVE DOSAGE IN ORDER TO REACH GOALS: A1C<7%, FASTING GLYCEMIA <130 mg/dL OR POST-PRANDIAL GLYCEMIA (2 HOURS) <180 mg/dL
STAGE 3: ADD A THIRD ORAL AGENT OR INTENSIFY INSULIN TREATMENT
Add a third oral agent with a different action mechanism. If in 2 or 3 months the targets of A1C<7%, fasting glycemia <130 mg/dL or post-prandial glycemia (2 hours) <180 mg/dL are not reached, start insulin therapy.
Intensify insulin therapy until the A1C<7%, fasting glycemia<130 mg/dL or post-prandial glycemia (2 hours) <180 mg/dL goals are reached.
INSTRUCTIONS AND ADDITIONAL COMMENTS
1.Similarly to any other Guideline, this Algorithm contains general recommendations about the most highly indicated therapeutic options for each clinical situation. The choice of the best therapeutical plan must be made based on medical judgment, in patient's options and in treatment costs with the respective drugs.
2.For further information on the potential of A1C level reduction of different drugs, please refer to table 6, in Module 4.
3.For further summarized information on therapeutic and usage safety profile of several drugs, please refer to table 7, in Module 4.
A1C = glycated hemoglobin; inhibitors ofDPP-4 (dipeptidyl peptidase-4 ); OAD = oral antidiabetic drugs.
The presentation format of the new algorithm proposal was developed taking as fundamental reference the recommendations by the Joslin Diabetes Center & Joslin Clinic and also by the American Association of Clinical Endocrinologists [6–9]..
The present algorithm was completed before the publication of the recent AACE/ACE algorithm . As pointed out in the recent AACE algorithm safety, efficacy and effectiveness must be the priorities and in developing countries like Brazil cost of medications is an important barrier and could Influence the treatment.
Summary of therapeutic profile of drugs used for treating type 2 diabetes
Comparative efficacy and potential of A1C reduction of different therapeutic interventions
Comparative efficacy of therapeutic interventions for reducing A1C levels
Expected Reduction in A1C (%)
Weight reduction and increase in physical activity
1.0 - 2.0
1.0 - 2.0
Insulin as additional therapy
1.5 - 3.5
1.0 - 2.0
0.5 - 1.4
0.5 - 1.0
0.5 - 0.8
0.5 - 0.8
0.5 - 1.5
Summary of therapeutic profiles of drugs used for treating type 2 diabetes
Pharmacologic options for oral DM-2 treatment
PROFILE AND ACTION MECHANISM
Slows down intestinal glucose absorption. Low potential of A1C reduction (0.5 - 0.8%). Gastrointestinal intolerance.
Metformin (Glifage®, others)
Reduces primarily the hepatic glucose production and fights insulin resistance. High potential of A1C reduction (2%). Gastrointestinal intolerance. Does not cause hypoglycemia. May promote mild weight loss. Contraindicated in case of renal dysfunction.
- Rosiglitazone (Avandia®)
- Pioglitazone (Actos®)
Primarily fight insulin resistance and reduces hepatic glucose production. Increases muscle, fatty tissue and liver sensitivity to insulin. Intermediate A1C reduction potential (0.5 - 1.4%). Promote hydric retention and weight gain, increasing the risk of heart failure. Also increase the risk of fracture. Recent results of studies such as RECORD and BARI 2D indicate that rosiglitazone does not increase the risk of infarction and CVD.
- Glimepiride (Amaryl®)
- Glibenclamide (Daonil®)
- Gliclazide (Diamicron MR®)
Stimulate endogenous insulin production by pancreatic beta cells, with pharmacological action medium to long (8-24 hours). Useful to control fasting glycemia and 24-hour glycemia. High potential of A1C reduction (2%). May cause hypoglycemia. Glibenclamide has higher risk of hypoglycemia. An alleged deleterious action on human beta cells has not yet been confirmed.
- Repaglinide (Novonorm®, Prandin®)
- Nateglinide (Starlix®)
Stimulate endogenous insulin production by pancreatic beta cells, with short duration (1-3 hours). Useful to control post-prandial hyperglycemia. Intermediate potential of A1C reduction (1.0 - 1.5%). May promote weight gain and hypoglycemia. Repaglinide is more powerful than nateglinide.
Incretin mimetics and DPP-4 inhibitors
- Exenatide (Byetta®)
- Vildagliptin (Galvus®)
- Sitagliptin (Januvia®)
This is a new therapeutic class for treating diabetes, whose mechanism includes stimulating beta cells to increase insulin synthesis and action on pancreatic alpha cells, reducing glucagon production. Glucagon has the effect of increasing glycemic levels. Average potential of A1C reduction (0.5 - 0.8%, depending on the basal A1C value). Do not cause hypoglycemia but gastrointestinal intolerance and pancreatitis have been described (exenatide and sitaglipitn) [13, 14].
Fixed combinations of oral antidiabetic drugs
Partial list of oral antidiabetic drugs used in combination therapy: two substances in separate pills
Action and Dosage Mechanism
Long acting secretagogue of insulin (glimepiride) + peripheral action insulin sensitizer (metformin).
Dosage: glimepiride - 1 mg and 2 mg + metformin - 500 mg.
Short-acting secretagogue of insulin (nateglinide) + peripheral action insulin sensitizer (metformin).
Dosage: nateglinide - 120 mg + metformin - 500 mg and 850 mg.
Partial relation of oral antidiabetic drugs at combination therapy: two substances in a single pill
Action and Dosage Mechanism
Peripheral action insulin sensitizer (metformin) + long-acting secretagogue of insulin (glibenclamide).
250 mg metformin+1.25 mg glibenclamide 500 mg metformin + 2.5 mg glibenclamide 500 mg metformin + 5 mg glibenclamide.
Combination of two peripheral action insulin sensitizers, with different action
2 mg rosiglitazone + 500 mg metformin
4 mg rosiglitazone + 500 mg metformin.
DPP-4inhibitor + peripheral action insulin sensitizer (metformin).
50 mg sitagliptin + 500,
850 or 1,000 mg metformin
DPP-4 inhibitor + peripheral action insulin sensitizer (metformin).
50 mg vildagliptin +
500, 850 or 1,000 mg metformin
Action profile of human insulin and human insulin analogs
Basically, there are three commercial presentation forms of insulin in the Brazilian marketplace: 1) human insulin in monotherapy; 2) human insulin analog in monotherapy; 3) biphasic human insulin analogs.
The addition of insulin to patients with type 2 diabetes must be done as soon as the patient did not reach the target of HbA1c . No definitve conclusions regarding the association between insulin therapy with glargine  and malignancies were established.
action profile of human insulin and human insulin analogs
Duration of action
Rapid-acting insulin analogs
Short acting insulin
(Novolin® R, Humulin® R)
Intermediate acting insulin
NPH (Novolin® N Humulin® N)
Long-acting insulin analogs
Up to 24 hours
Up to 24 hours
Biphasic rapid and long-acting insulin analogs
Insulin aspart and protaminated (70%) + insulin aspart (30%)
Pre-mix with 70% long-acting insulin aspart (up to 24 hours) + 30% aspart insulin of immediate release, short acting (4-6 hours), to control post-prandial and interprandial glycemic levels
Neutral protamine insulin lispro (75%) + insulin lispro (25%)
Pre-mix with 75% intermediate acting insulin NPL (up to 24 hours) + 25% insulin of immediate release, short-acting (4-5 hours), to control post-prandial and interprandial glycemic levels
Neutral protamine insulin lispro (50%) + insulin lispro (50%)
Pre-mix with 50% intermediate acting insulin NPL (up to 24 hours) + 50% insulin of immediate release, short-acting (4-5 hours), to control post-prandial and interprandial glycemic levels
Treatment cost estimate for various therapeutic options
The concept of Evidence-Based Medicine recognizes three main components to help physicians define therapeutic conduct: the evidence of research per se, the clinical expertise of physicians and patient preferences. Treatment cost must be one of the fundamental factors for patients to fulfill their right of choice in due proportion, in the concept of evidence-based medicine .
We added two website suggestions for physicians to obtain information about drug costs for consumers of the therapeutic options they intend to prescribe. In both references, prices are displayed in different rows expressing the costs of each drug, considering the incidence of distinct tax rates, which vary according to Brazilian states. For the physician, the desired piece of information is the maximum retail price (MRP), which may be found in the last row to the right in price tables.
Links to browse drug prices
Requires previous and free subscription. Search for item "drugs/prices" on the left row in the homepage
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