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2016 ; 39
(7
): 1281-6
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Should Restrictions Be Relaxed for Metformin Use in Chronic Kidney Disease? No,
We Should Never Again Compromise Safety!
#MMPMID27330129
Kalantar-Zadeh K
; Kovesdy CP
Diabetes Care
2016[Jul]; 39
(7
): 1281-6
PMID27330129
show ga
Metformin is and has been considered as first-line therapy for type 2 diabetes
for over a quarter of a century. Like other biguanides, metformin can cause a
lactic acidosis that is exceptionally rare but fatal. The likelihood of
metformin-associated lactic acidosis is substantially higher in patients with
kidney impairment and also among those with seemingly normal kidney function who
are at risk of acute kidney injury (AKI). Hence, regulatory agencies in many
industrialized nations have maintained strict renal restrictions surrounding
metformin. However, there have been millions of people exposed to metformin for
many years, many of them with serum creatinine values at or close to 1.5 mg/dL
with estimated glomerular filtration rates (eGFRs) much below 60 mL/min/1.73 m(2)
who have not developed lactic acidosis. Thus, there clearly remains controversy
in this area, and there has been heightened pressure to remove the renal
restrictions of metformin. To provide a discussion on the pros and cons of
relaxing the renal restrictions for metformin use, we provide a
Point-Counterpoint. In the point narrative below, Drs. Kalantar-Zadeh and Kovesdy
provide their argument that although there is little evidence of the potential
benefits of metformin in kidney disease, just considering the sheer numbers of
metformin users and the high fatality rate of its associated lactic acidosis, the
most appropriate practice is to avoid metformin use in people with eGFR <45
mL/min/1.73 m(2) or in those who are at high risk of AKI irrespective of
underlying eGFR. In the following counterpoint narrative, Drs. Bakris and Molitch
argue that the data from a very large analysis demonstrate clearly that serum
creatinine should be supplanted with eGFR as the criteria for metformin use and
that the incidence of lactic acidosis is only elevated in those with a reduced
eGFR who become dehydrated for various reasons or in those exposed to some toxin
resulting in AKI. Otherwise the data clearly support the use of metformin under
normal circumstances down to eGFR >30 mL/min/1.73 m(2)-William T. CefaluEditor in
Chief, Diabetes Care.
|Acidosis, Lactic/*chemically induced/prevention & control
[MESH]
|Acute Kidney Injury/*prevention & control
[MESH]
|Creatinine/blood
[MESH]
|Diabetes Mellitus, Type 2/*drug therapy
[MESH]
|Glomerular Filtration Rate
[MESH]
|Humans
[MESH]
|Hypoglycemic Agents/adverse effects/*therapeutic use
[MESH]
|Metformin/adverse effects/*therapeutic use
[MESH]