Increased serum homocysteine and sudden death resulting from coronary atherosclerosis with fibrous plaques.
BACKGROUND
Modest elevations of total homocysteine have been associated with increased risk for coronary atherosclerosis but correlation between elevated homocysteine and plaque morphology has not been described in humans.


METHODS
We determined serum homocysteine at postmortem from 87 men with coronary thrombus (62 of whom were diagnosed as acute), from 35 men with severe coronary disease without thrombus, and from 46 controls. In coronary deaths, atherosclerotic plaques at the sites of maximal luminal narrowing of the four epicardial coronary arteries were classified as fibrous plaques, fibrous cap atheromas, thin-cap atheromas, and healed ruptures, and macrophage infiltration was assessed semiquantitatively.


RESULTS
Median serum homocysteine postmortem as a result of acute thrombus was 10.4 micro mol/L (P=0.4 versus controls), 12.1 micro mol/L in men with organized thrombi (P=0.1 versus controls), 15.6 micro mol/L in men without thrombus (P=0.007 versus controls), and 9.8 micro mol/L in controls. The median homocysteine was 12.1 micro mol/L in 65 men with healed infarcts (P=0.03 versus controls). The number of fibrous plaques was associated with log-normalized homocysteine (P=0.004), independent of age, albumin, smoking, hypertension, and serum cholesterol. Homocysteine levels in the upper tertile (>15 micromol/L) were associated with sudden death without acute or organized thrombus (odds ratio 3.8, P=0.03) independent of age and other risk factors; the coexistence of diabetes increased the association (odds ratio 25.1, P=0.009, versus lowest tertile < or =8.5 micromol/L).


CONCLUSIONS
Increased serum homocysteine is associated with sudden death in the absence of acute coronary thrombosis, especially with concomitant diabetes, and with the presence of lipid-poor, fibrous plaques.
Burke
Allen P
AP
Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, Washington, DC, USA.
Fonseca
V
V
Kolodgie
Frank
F
Zieske
Arthur
A
Fink
Louis
L
Virmani
Renu
R
D000328:Adult; D000704:Analysis of Variance; D003324:Coronary Artery Disease / Q000097:blood* / Q000473:pathology*; D003328:Coronary Thrombosis / Q000097:blood / Q000473:pathology; D016757:Death, Sudden, Cardiac / Q000453:epidemiology* / Q000473:pathology*; D003920:Diabetes Mellitus / Q000097:blood; D005355:Fibrosis; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000097:blood; D012307:Risk Factors
D006710:Homocysteine