Role of surrogate markers in assessing patients with diabetes mellitus and the metabolic syndrome and in evaluating lipid-lowering therapy.
Diabetes mellitus and the metabolic syndrome (MS) are reaching epidemic proportions in the United States, and cardiovascular disease continues to be the leading cause of death among patients with diabetes. A range of noninvasive screening tools may help reduce the morbidity and mortality of patients with diabetes because of early detection of subclinical cardiovascular disease and active monitoring of the effectiveness of therapy. Surrogate markers of subclinical disease include conventional and contrast-enhanced ultrasound imaging of carotid artery intima-media thickness (c-IMT), 2-dimensional echocardiography, coronary artery calcium imaging, cardiac magnetic resonance imaging, ankle-brachial indices, and brachial artery reactivity testing. Because these noninvasive imaging tools are relatively comfortable and entail relatively low risk to the patient, they are ideal for initial screening and for the repeated imaging that is required for monitoring the effectiveness of therapy. Moreover, when used in large numbers of patients with diabetes, prediabetes, and the MS, these imaging tools may be useful in developing and validating thresholds for the use of lipid-lowering therapy as well as clear therapeutic goals for this population. In addition, contrast-enhanced c-IMT scans now produce real-time images of the vasa vasorum and neovascularization of atherosclerotic plaque, potentially causing a paradigm shift in our view of the genesis of atherosclerosis and affecting treatment options for all populations. Thus, surrogate markers may not only help improve individual patient outcomes, they also may help direct scarce medical resources to maximize medical benefits, improve overall medical care, and minimize costs and untoward side effects.
Rajaram
Venkataraman
V
Rush University Medical Center, Chicago, Illinois, USA.
Pandhya
Sanjay
S
Patel
Samir
S
Meyer
Peter M
PM
Goldin
Marshall
M
Feinstein
Matt J M
MJ
Neems
Rachel
R
Liebson
Philip R
PR
Fiedler
Benjamin M
BM
Macioch
James E
JE
Feinstein
Steven B
SB
D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000032:analysis; D001707:Biopsy, Needle; D001786:Blood Glucose / Q000032:analysis; D002318:Cardiovascular Diseases / Q000517:prevention & control; D016893:Carotid Stenosis / Q000175:diagnosis* / Q000517:prevention & control; D015897:Comorbidity; D017023:Coronary Angiography / Q000379:methods; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000517:prevention & control; D003920:Diabetes Mellitus / Q000175:diagnosis / Q000188:drug therapy* / Q000453:epidemiology; D005260:Female; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000627:therapeutic use*; D007150:Immunohistochemistry; D008297:Male; D024821:Metabolic Syndrome / Q000175:diagnosis / Q000188:drug therapy* / Q000453:epidemiology; D008875:Middle Aged; D011379:Prognosis; D016032:Randomized Controlled Trials as Topic; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D017539:Tunica Intima / Q000187:drug effects / Q000473:pathology; D018608:Ultrasonography, Doppler
D015415:Biomarkers; D001786:Blood Glucose; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors