<b>Introduction</b>
<p>Diabetes
is a risk factor for severe limb ischemia (SLI), a condition associated with
high mortality, morbidity and limb loss. The reactive glucose-derived
dicarbonyl methylglyoxal (MGO) is a major precursor for advanced glycation
endproducts (AGEs) and potential driver of cardiovascular disease. We
investigated whether plasma MGO levels are associated with poor outcomes in
SLI.</p>
<p><b>Methods</b>
<b></b></p>
<p>We
measured plasma levels of MGO, free AGEs, and D-lactate, the detoxification
endproduct of MGO, with ultra-performance liquid chromatography tandem mass
spectrometry at baseline in 160 patients (64.8±13.3years, 67.5% male, 37.5%
diabetes) with no-option SLI and recorded major adverse outcomes (n=86, containing
death n=53 or amputations n=49 (First event counted)) over 5-year follow-up.
Data were analyzed with linear or Cox regression, after Ln-transformation of
the independent variables, adjusted for sex, age, trial arm, diabetes, eGFR,
systolic blood pressure, cholesterol levels and BMI. Associations are reported
per 1SD plasma marker. </p>
<p><b>Results</b></p>
<p>Higher
plasma MGO levels were associated with more adverse outcomes (RR: 1.44; 95%CI:
1.11-1.86) and amputations separately (1.55; 1.13-2.21). We observed a similar,
but weaker trend for mortality (1.28; 0.93-1.77). The MGO derived AGE N<sup>ε</sup>-(carboxyethyl)lysine was also
associated with more adverse outcomes (1.46; 1.00-2.15) and amputations (1.71;
1.04-2.79). D-lactate was not associated with adverse incident outcomes. Higher
plasma MGO levels were also associated with more inflammation and white blood cells
and fewer progenitor cells. </p>
<p><b>Conclusion</b></p>
<p>Plasma
MGO levels are associated with adverse outcomes in SLI. Future studies should investigate
whether MGO-targeting therapies improve outcomes in SLI.<br>
</p>