Carotid intima-media thickness in young survivors of acute myocardial infarction.

Background: Carotid intima-media thickness (CIMT) is considered to be a useful surrogate marker of coronary atherosclerosis. However, it is unclear whether this applies to young patients with acute myocardial infarction (AMI), in whom most cases are attributable to the destabilization of focal atheroma.

Objective: To assess CIMT in patients experiencing AMI at a young age.

Methods: CIMT was investigated in young survivors of AMI (78 male and 20 female) occurring before 45 years of age in men and before 50 years of age in women. CIMT values were compared with those of a sex-, age- and smoking status-matched sample selected from participants of a large epidemiological survey (115 men and 144 women). CIMT was measured on the anterior and posterior walls of the distal common carotid artery.

Results: In post-AMI male patients, the mean average CIMT, comprised of measurements of both the near and far walls on both sides, was significantly increased compared with controls (0.67±0.10 mm versus 0.60±0.09 mm; P<0.001), while it did not differ in post-AMI female patients (0.60±0.07 mm versus 0.60±0.10 mm). Mean maximum CIMT was greater in both male and female post-AMI patients (0.94±0.15 mm versus 0.81±0.13 mm; P<0.001 in men and 0.89±0.14 mm versus 0.80±0.11 mm; P=0.001 in women).

Conclusions: In young AMI survivors, CIMT appeared to be significantly increased to a greater extent in men than in women. Although most patients had single- or double-vessel coronary disease, the overall increase in CIMT suggests that their coronary events were not due to destabilization of a single focal atheroma but may have reflected a generalized atherosclerotic process.