[ Diabetes Type 1 ]

Use of Metformin in the Setting of Mild-to-Moderate Renal Insufficiency

The combination of strength training and creatine supplementation is beneficial for people with diabetes type 2 write researchers at the University of Sao Paulo in Medicine & Science in the journal Sports & Exercise. Great discussion question you brought up. Creatine kinase flux (by 31P nuclear magnetic resonance saturation transfer method), cardiac performance, and oxygen consumption were measured in control and streptozotocin-induced diabetic rat hearts. Generally, a high serum creatinine level means that your kidneys aren’t working well. Diabetic nephropathy prevalence was 15.1 and 11.5%, respectively (8688 and 5955 patients). ● Western medicines. This was in proportion to the decline of V(max)and therefore predicted by the rate equation for the CK reaction.

Each group of patients was carefully chosen and constituted of equal number of males and females. Further studies will be needed to determine the relevance of plasma CTGF as a clinical marker and/or pathogenic factor in diabetic nephropathy. Lipopolysaccharide treatment significantly increased serum and cardiac TNF-alpha and IL-6 concentrations. Then, more and more creatinine and urea build up in the blood, resulting in high creatinine and BUN levels. If you are considering taking creatine supplements, first talk to your doctor or Clicks pharmacist about whether you should be taking it and the correct dosage if so. Accordingly, sarcopenia, the age-related loss of muscle mass, has been suggested as a major risk factor for low BMD and fracture in several epidemiological studies [4–6]. After a median period of 10 years, this subgroup experienced a 39% (P = 0.010) risk reduction for myocardial infarction and a 36% reduction for total mortality (P = 0.011) compared with conventional diet treatment.

It’s hard to test improvements in tackles in the laboratory, and when an athlete performs better, it’s impossible to separate the effects of creatine from everything else in a training regimen. In an 8.5-year posttrial monitoring study, after participants no longer were randomly assigned to their treatments, individuals originally assigned to metformin (n = 279) continued to demonstrate a reduced risk for both myocardial infarction (relative risk 33%, P = 0.005) and total mortality (relative risk 27%, P = 0.002) (9). In the late 1960s, researchers began using needle biopsy techniques to study the breakdown and resynthesis of adenosine triphosphate (ATP) and creatine phosphate with exercise. Normal creatinine levels indicate the test sample is undiluted, whereas low amounts of creatinine in the urine indicate either a manipulated test or low initial baseline creatinine levels. Maar voor vegetariërs, die deze uitputting van de aarde willen voorkomen, of om andere redenen afzien van het eten van vlees, is het heel moeilijk om hun portie creatine uit voedsel te halen. This could result in these patients undergoing unnecessary follow-up testing or treatment. As a result, metformin is widely considered an ideal first-line agent for the treatment of type 2 diabetes, as recommended by several clinical guidelines (12–14).


There was no evidence of diabetic retinopathy. Despite these proven benefits, metformin remains contraindicated in a large segment of the type 2 diabetic population, largely because of concerns over the rare adverse effect of lactic acidosis. For these reasons, the drug has been restricted to individuals with normal creatinine levels as a surrogate for renal competence. People seeking to enhance muscle performance sometimes take creatine supplements, such as creatine salts or creatine esters. Creatinine is converted to N-methylhydantoin and ammonia. It is tempting to speculate that the addition of creatine might have maximized the effects of exercise on insulin sensitivity and glycemic control, but it is impossible to distinguish whether the current findings result from creatine treatment or the interaction between creatine and exercise. Reporting eGFR values with serum creatinine results allows primary care providers and specialists in other fields to better interpret their results.

The association with lactic acidosis eventually led to its withdrawal from the market. The first and most common type of postrenal failure is obstructive uropathy. In contrast to metformin, modestly raised phenformin concentrations may reduce peripheral glucose oxidation and enhance peripheral lactate production, which can increase circulating lactate levels. In fact, phenformin levels correlate with lactate concentration, whereas metformin levels do not (19). In addition, ~10% of European Caucasians have an inherent defect in phenformin hydroxylation, which may lead to drug accumulation and, as a result, elevated lactate levels (20). The experience with phenformin resulted in cautious use of metformin in Europe. In the 1980s, the creatinine cut points for contraindication to metformin were considered to be appropriate at 1.4 mg/dL in women and 1.5 mg/dL in men.

This was based on the calculated ability to remove 3 g of metformin (an amount slightly beyond the maximum daily U.S. dose) at steady-state levels within 24–48 h. In fact, the ability to comfortably remove the drug extends up to creatinine levels of 1.8–2.0 mg/dL, but the cut points chosen were intentionally set lower to ensure that those patients who may be lost to follow-up and whose creatinine levels increase over time would not be at risk for appreciable drug accumulation. Metformin was not approved in the U.S. until December of 1994 and was marketed in 1995. The experience with phenformin led to judicious labeling and recommendations for careful monitoring of adverse events. Its new-drug application was the subject of extensive review.

The risk for lactic acidosis was estimated to be ~3 cases per 100,000 patient-years based on cases reported from France, the U.K., and other countries where pharmacovigilance information was available (21). Similar estimates were quoted from Sweden (2.4 cases per 100,000 patient-years), where the number of cases appeared to be decreasing despite rising clinical use of metformin. After careful deliberation, metformin was approved by the U.S. Food and Drug Administration, with lactic acidosis risk seen as small, although inevitable with future widespread availability of the drug. The prescribing information for metformin in the current label is explicit with respect to renal contraindications, based on serum creatinine cut points. It proscribes use at or above the 1.4 and 1.5 mg/dL levels in women and men, respectively. The recently updated Kidney Disease Outcomes Quality Initiative guidelines from the National Kidney Foundation are perfectly consistent with the label (22).

Yet, certain U.S. practice guidelines substantially differ in their recommendations for metformin use related to renal status. The annually updated clinical practice guidelines issued by the American Diabetes Association, for example, do not actually discuss renal thresholds (16) but refer the reader to a separate consensus statement for prescribing details. PMID 22745616. Two other studies (38,40) of sicker patients admitted to hospitals in Germany and the U.S. confirmed high frequency of metformin use despite various contraindications (73 and 27%, respectively).

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