Diabetes mellitus type 2

From Wikipedia, the free encyclopedia

Diabetes mellitus type 2 or Type 2 Diabetes (formerly called non- insulin-dependent diabetes mellitus (NIDDM), or adult-onset diabetes) is a metabolic disorder that is primarily characterized by insulin resistance, relative insulin deficiency and hyperglycemia. It is often managed by increasing physical activity and dietary modification, although medications and insulin are often needed, especially as the disease progresses. It is rapidly increasing in the developed world, and there is some evidence that this pattern will be followed in much of the rest of the world in coming years. CDC has characterized the increase as an epidemic.[1] In addition, whereas this disease used to be also seen primarily in adults over age 40, in contrast to Diabetes mellitus type 1, it is now increasingly seen in children and adolescents, an increase thought to be linked to rising rates of obesity in this age group, although it remains a minority of cases.[2]

Unlike Type 1 diabetes, there is little tendency toward ketoacidosis in Type 2 diabetes, though it is not unknown. One effect that can occur is nonketonic hyperglycemia which also is quite dangerous, though it must be treated very differently. Complex and multifactorial metabolic changes very often lead to damage and function impairment of many organs, most importantly the cardiovascular system in both types. This leads to substantially increased morbidity and mortality in both Type 1 and Type 2 patients, but the two have quite different origins and treatments despite the similarity in complications.

Diabetes mellitus
Types of Diabetes
Diabetes mellitus type 1
Diabetes mellitus type 2
Gestational diabetes

Pre-diabetes:
Impaired fasting glycaemia
Impaired glucose tolerance
Disease Management
Diabetes management:
•Diabetic diet
•Anti-diabetic drugs
•Conventional insulinotherapy
•Intensive insulinotherapy
Other Concerns
Cardiovascular disease

Diabetic comas:
•Diabetic hypoglycemia
•Diabetic ketoacidosis
•Nonketotic hyperosmolar

Diabetic myonecrosis
Diabetic nephropathy
Diabetic neuropathy
Diabetic retinopathy

Diabetes and pregnancy
Blood tests
Blood sugar
Fructosamine
Glucose tolerance test
Glycosylated hemoglobin

Contents

[edit] Pathophysiology

Insulin resistance means that body cells do not respond appropriately when insulin is present. Unlike insulin-dependent diabetes mellitus (Type 1), the insulin resistance is generally "post-receptor", meaning it is a problem with the cells that respond to insulin rather than a problem with insulin production.

Other important contributing factors:

  • increased hepatic glucose production (e.g., from glycogen degradation), especially at inappropriate times (typical cause is deranged insulin levels, as insulin controls this function in liver cells)
  • decreased insulin-mediated glucose transport in (primarily) muscle and adipose tissues (receptor and post-receptor defects)
  • impaired beta-cell function—loss of early phase of insulin release in response to hyperglycemic stimuli
  • Cancer survivors who received allogenic Hematopoietic Cell Transplantation (HCT) are 3.65 times more likely to report type 2 diabetes than their siblings. Total body irradiation (TBI) is also associated with a higher risk of developing diabetes.

This is a more complex problem than Type 1, but is sometimes easier to treat, especially in the early years when insulin is often still being produced internally. Type 2 may go unnoticed for years before diagnosis, since symptoms are typically milder (eg, no ketoacidosis, coma, etc) and can be sporadic. However, severe complications can result from improperly managed Type 2 diabetes, including renal failure, blindness, slow healing wounds (including surgical incisions), and arterial disease, including coronary artery disease. The onset of Type 2 has been most common in middle age and later life, although it is being more frequently seen in adolescents and young adults due to an increasing rate of obesity in these groups. A type of Type 2 diabetes called MODY is occasionally also seen in adolescents.

Diabetes mellitus type 2 is presently of unknown etiology (i.e., origin). Diabetes mellitus with a known etiology, such as secondary to other diseases, known gene defects, trauma or surgery, or the effects of drugs, is more appropriately called secondary diabetes mellitus. Examples include diabetes mellitus caused by hemochromatosis, pancreatic insufficiencies, or certain types of medications (e.g. long-term steroid use).

About 90–95% of all North American cases of diabetes are type 2[3], and about 20% of the population over the age of 65 has diabetes mellitus Type 2. The fraction of Type 2 diabetics in other parts of the world varies substantially, almost certainly for environmental and lifestyle reasons, though these are not known in detail. Diabetes affects over 150 million people worldwide and this number is expected to double by 2025[3]. There is also a strong inheritable genetic connection in Type 2 diabetes: having relatives (especially first degree) with Type 2 increases risks of developing Type 2 diabetes very substantially. In addition, there is also a mutation to the Islet Amyloid Polypeptide gene that results in an earlier onset, more severe, form of diabetes[4],[5]. About 55 percent of type 2 are obese[6] —chronic obesity leads to increased insulin resistance that can develop into diabetes, most likely because adipose tissue (especially that in the abdomen around internal organs) is a (recently identified) source of several chemical signals to other tissues (hormones and cytokines). Other research shows that Type 2 diabetes causes obesity as an effect of the changes in metabolism and other deranged cell behavior attendant on insulin resistance.[7]

Diabetes mellitus Type 2 is often associated with obesity, hypertension, elevated cholesterol (combined hyperlipidemia), and with the condition often termed Metabolic syndrome (it is also known as Syndrome X, Reavan's syndrome, or CHAOS). It is also associated with acromegaly, Cushing's syndrome and a number of other endocrinological disorders. Additional factors found to increase risk of type 2 diabetes include aging[8], high-fat diets[9] and a less active lifestyle[10].

[edit] Diagnosis

The World Health Organization definition of diabetes is for a single raised glucose reading with symptoms, otherwise raised values on two occasions, of either[11]:

  • fasting plasma glucose ≥ 7.0 mmol/l (126 mg/dl)
or

[edit] Screening and prevention

Interest has arisen in preventing diabetes due to research on the benefits of treating patients before overt diabetes. Although the U.S. Preventive Services Task Force (USPSTF) concluded that "the evidence is insufficient to recommend for or against routinely screening asymptomatic adults for type 2 diabetes, impaired glucose tolerance, or impaired fasting glucose"[12][13], this was a grade I recommendation when published in 2003. However, the USPSTF does recommend screening for diabetics in adults with hypertension or hyperlipidemia (grade B recommendation).

In 2005, an evidence report by the Agency for Healthcare Research and Quality concluded that "there is evidence that combined diet and exercise, as well as drug therapy (metformin, acarbose), may be effective at preventing progression to DM in IGT subjects".[14]

[edit] Accuracy of tests for early detection

If a 2-hour postload glucose level of at least 11.1 mmol/L (≥ 200 mg/dL) is used as the reference standard, the fasting plasma glucose > 7.0 mmol/L (126 mg/dL) diagnoses current diabetes with[13]:

A random capillary blood glucose > 6.7 mmol/L (120 mg/dL) diagnoses current diabetes with[15]:

Glycosylated hemoglobin values that are elevated (over 5%), but not in the diabetic range (not over 7.0%) are predictive of subsequent clinical diabetes in US female health professionals.[16] In this study, 177 of 1061 patients with glycosylated hemoglobin value less than 6% became diabetic within 5 years compared to 282 of 26281 patients with a glycosylated hemoglobin value of 6.0% or more. This equates to a glycosylated hemoglobin value of 6.0% or more having:

[edit] Benefit of early detection

Since publication of the USPSTF statement, a randomized controlled trial of prescribing acarbose to patients with "high-risk population of men and women between the ages of 40 and 70 years with a body mass index (BMI), calculated as weight in kilograms divided by the square of height in meters, between 25 and 40. They were eligible for the study if they had IGT according to the World Health Organization criteria, plus impaired fasting glucose (a fasting plasma glucose concentration of between 100 and 140 mg/dL or 5.5 and 7.8 mmol/L) found a number needed to treat of 44 (over 3.3 years) to prevent a major cardiovascular event[17].

Other studies have shown that life-style changes[18], xenical[19] and metformin[20] can delay the onset of diabetes.

[edit] Treatment

Diabetes mellitus type 2 is a chronic, progressive disease that has no established cure, but does have well-established treatments which can avoid most of the formerly inevitable consequences of the condition. There are two main goals of treatment:

  1. reduction of mortality and concomitant morbidity (from assorted diabetic complications)
  2. preservation of quality of life

The first goal can be achieved through close glycemic control (i.e., to near 'normal' blood glucose levels); the reduction in severity of diabetic side effects has been very well demonstrated in several large clinical trials and is established beyond controversy. The second goal is often addressed (in developed countries) by support and care from teams of diabetic health workers (usually physician, PA, nurse, dietitian or a certified diabetic educator). Endocrinologists, family practitioners, and general internists are the physician specialties most likely to treat people with diabetes. Knowledgeable patient participation is vital to clinical success, and so patient education is a crucial aspect of this effort.

Type 2 is initially treated by adjustments in diet and exercise, and by weight loss, most especially in obese patients. The amount of weight loss which improves the clinical picture is sometimes modest (2-5 kg or 4.4-11 lb); this is almost certainly due to currently poorly understood aspects of fat tissue activity, for instance chemical signaling (especially in visceral fat tissue in and around abdominal organs). In many cases, such initial efforts can substantially restore insulin sensitivity.

[edit] Treatment goals

Treatment goals for Type 2 diabetic patients are related to effective control of blood glucose, blood pressure and lipids to minimize the risk of long-term consequences associated with diabetes. They are suggested in clinical practice guidelines released by various national and international diabetes agencies.

The targets are:

  • Preprandial blood glucose: 4.0 to 6.0 mmol/L[23]

[edit] Self monitoring of blood glucose

Main article: Blood glucose monitoring

Self-monitoring of blood glucose may not improve outcomes in some cases, that is among "reasonably well controlled non-insulin treated patients with Type 2 diabetes".[24] Nevertheless, it is very strongly recommended for patients in whom it can assist in maintaining proper glycemic control, and is well worth the cost (sometimes considerable) if it does. It is the only source of current information on the glycemic state of the body.

The National Institute for Health and Clinical Excellence (NICE), UK released updated diabetes recommendations on the 30th May 2008. They include that self-monitoring of blood glucose levels for people with newly diagnosed type 2 diabetes must be part of a structured self-management education plan.[25]

[edit] Dietary management

Main article: Diabetic diet

Modifying the diet is known to help control glucose (or glucose equivalent, eg starch) intake, and in consequence, blood glucose levels. Additionally, weight loss is often recommended in persons suffering from Type 2 diabetes for the reasons discussed above.

[edit] Exercise

In September 2007, a joint randomized controlled trial by the University of Calgary and the University of Ottawa found that "Either aerobic or resistance training alone improves glycemic control in Type 2 diabetes, but the improvements are greatest with combined aerobic and resistance training than either alone."[26][27] The combined program reduced the HbA1c by 0.5 percentage point. Other studies have established that the amount of exercise needed is not large or extreme, but must be consistent and continuing. Examples might include a brisk 45 minute walk every other day.

[edit] Antidiabetic drugs

There are several drugs available for Type 2 diabetics -- most are unsuitable or even dangerous for use by type 1 diabetics. They fall into several classes and are not equivalent, nor can they be simply substituted one for another. All are prescription drugs.

Metformin 500mg tablets
Metformin 500mg tablets
Main article: anti-diabetic drug

One of the most important drug now in use for Type 2 diabetes is the Biguanide metformin which works primarily by reducing liver release of blood glucose from glycogen stores as well as provoking some increase in cellular uptake of glucose in body tissues. Both historically, and currently, the most commonly used are the Sulfonylurea group, of which several members (including glibenclamide and gliclazide) are widely used; these increase glucose stimulated insulin secretion by the pancreas.

Newer drug classes include:

[edit] Oral drugs

A systematic review of randomized controlled trials found that metformin and second-generation sulfonylureas are the preferred choices for most with type 2 especially those early in the course of the disease.[28] Failure of response after a time is not unknown with most of these agents: the initial choice of anti-diabetic drug has been compared in a randomized controlled trial which found "cumulative incidence of monotherapy failure at 5 years of 15% with rosiglitazone, 21% with metformin, and 34% with glyburide".[29] Of these, rosiglitazone users showed more weight gain and edema than did non-users.[29] Rosiglitazone may increase risk of death from cardiovascular causes.[30] Pioglitazone and rosiglitazone may also increase the risk of fractures.[31][32]

For patients who also have heart failure, metformin may be the best tolerated drug.[33]

[edit] Injectable peptide analogs

A systematic review and meta-analysis of randomized controlled trials found that, compared to placebo, GLP-1 analogs such as exenatide lowered A1c by 0.97% while DPP-4 inhibitors lowered A1c by 0.74%, comparable to other antidiabetic drugs.[34] GLP-1 analogs resulted in weight loss and had more gastrointestinal side effects, while DPP-4 inhibitors were weight neutral and increased risk for infection and headache, but both classes appear to present an alternative to other antidiabetic drugs.

[edit] Insulin preparations

If antidiabetic drugs fail (or stop helping), insulin therapy may be necessary – usually in addition to oral medication therapy – to maintain normal or near normal glucose levels.

Typical total daily dosage of insulin is 0.6 U/kg.[35] More complicated estimations to guide initial dosage of insulin are:[36]

  • For men, [(fasting plasma glucose [mmol/liter]–5)x2] x (weight [kg]÷(14.3xheight [m])–height [m])
  • For women, [(fasting plasma glucose [mmol/liter]–5)x2] x (weight [kg]÷(13.2xheight [m])–height [m])

The initial insulin regimen are often chosen based on the patient's blood glucose profile.[37] Initially, adding nightly insulin to patients failing oral medications may be best.[38] Nightly insulin combines better with metformin than with sulfonylureas.[35] The initial dose of nightly insulin (measured in IU/d) should be equal to the fasting blood glucose level (measured in mmol/L). If the fasting glucose is reported in mg/dl, multiply by 0.05551 to convert to mmol/L.[39]

When nightly insulin is insufficient, choices include:

  • Premixed insulin with a fixed ratio of short and intermediate acting insulin; this tends to be more effective than long acting insulin, but is associated with increased hypoglycemia.[40][41][42]. Initial total daily dosage of biphasic insulin can be 10 units if the fasting plasma glucose values are less than 180 mg/dl or 12 units when the fasting plasma glucose is above 180 mg/dl".[41] A guide to titrating fixed ratio insulin is available (http://www.annals.org/cgi/content/full/145/2/125/T4).[37]

[edit] Alternative medicines

Carnitine has been shown to increase insulin sensitivity and glucose storage in humans. [44]. It is important to note that this was with a constant blood infusion, not an oral dose, and that the clinical significance of this result is in practice unclear. Studies have shown that carnitine may increase blood clotting in Type 1 (and assumedly Type 2) diabetics with recent hyperglycemia (high blood sugar) due to higher platelet ATP:ADP ratios [45]

Taurine has also shown significant improvement in insulin sensitivity and hyperlipidemia in rats.[46]

Neither of these have shown permanent positive effects, nor a complete restoration to pre-diabetes conditions, only improvement. Their clinical importance in humans remains unclear.

[edit] Antihypertensive agents

Main article: Antihypertensive

The goal blood pressure is 130/80 which is lower than in non-diabetic patients.[47]

[edit] ACE inhibitors

The HOPE study suggests that diabetics should be treated with ACE inhibitors (specifically ramipril 10 mg/d) if they have one of the following [48]:

After treatment with ramipril for 5 years the number needed to treat was 50 patients to prevent one cardiovascular death. Other ACE inhibitors may not be as effective.[49]

[edit] Hypolipidemic agents

Main article: Hypercholesterolemia#Diabetic_patients

[edit] Gastric Bypass Surgery

Gastric Bypass procedures are currently considered an elective procedure with no universally accepted algorithm to decide who should have the surgery. In the diabetic patient, certain types result in 99-100% prevention of insulin resistance and 80-90% clinical resolution or remission of Type II diabetes. In 1991, the NIH (National Institute of Health) Consensus Development Conference on Gastrointestinal Surgery for Obesity proposed that the body mass index (BMI) threshold to consider surgery should drop from 40 to 35 in the appropriate patient. More recently, the American Society for Bariatric Surgery (ASBS) and the ASBS Foundation suggested that the BMI threshold be lowered to 30 in the presence of severe co-morbidities. [50] More debate has flourished about the role of gastric bypass surgery in Type 2 diabetics since the publication of The Swedish Obese Subjects Study. The largest prospective series showed a large decrease in the occurrence of Type II diabetes in the post-gastric bypass patient at both 2 years (odds ratio was 0.14) and at 10 years (odds ratio was 0.25). [51]

A 20-year study of the Greenville gastric bypass found that 80% of those with Type 2 diabetes before surgery no longer required insulin or oral agents to maintain normal glucose levels. Weight loss occurred rapidly in many people in the study who had had the surgery. The 20% who did not respond to bypass surgery were, typically, those who were older and had had diabetes for over 20 years.[52]

In January 2008, The Journal of the American Medical Association (JAMA) published the first randomized controlled trial comparing the efficacy of laparoscopic adjustable gastric banding against conventional medical therapy in the obese patient with type 2 diabetes. Laparoscopic Adjustable Gastric Banding results in remission of Type 2 diabetes among affected patients diagnosed within the previous two years according to a randomized controlled trial.[53] The relative risk reduction was 69.0%. For patients at similar risk to those in this study (87.0% had Type 2), this leads to an absolute risk reduction of 60%. 1.7 patients must be treated for one to benefit (number needed to treat = 1.7). Click here to adjust these results for patients at higher or lower risk of Type 2 diabetics.

[edit] Suspected action mechanism

The effectiveness of gastric bypass surgery in Type 2 remission was long thought to be due to weight loss. When it was discovered that rats whose duodenum and upper lower intestine were removed also showed the Type 2 remission effect, and when this was also observed in humans, the suspicion arose that some signal originating in the excised tissue was responsible for the development or maintenance of Type 2's insulin resistance. When that signal is removed, body cells revert to normal behavior and lose their insulin insensitivity. As of Q1 2008, the nature of the speculative signal is unclear, though there is near universal suspicion that it is chemical and present in very small quantities (eg, like hormones). Research is actively pursuing the mechanism of action. Some physicians have concluded that, even without good evidence of an established action mechanism, such surgery is indicated in Type 2 patients, especially those who are obese.

[edit] References

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