Published Online
on June 30, 2003

A more recent version of this article appeared on July 22, 2003

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Submitted on February 5, 2003
Revised on April 22, 2003
Accepted on April 25, 2003

C-Reactive Protein and Lesion Morphology in Patients With Acute Myocardial Infarction

Toshihiko Sano MD, Atsushi Tanaka MD^*, Masashi Namba MD, Yoshiharu Nishibori MD, Yukio Nishida MD, Takahiko Kawarabayashi MD, Daiju Fukuda MD, Kenei Shimada MD, and Junichi Yoshikawa MD

From Baba Memorial Hospital, Sakai, Japan (T.S., A.T., M.N., Y. Nishibori, Y. Nishida, T.K.); and the Department of Internal Medicine and Cardiology, Graduate School of Medicine, Osaka City University, Osaka, Japan (D.F., K.S., J.Y.).

^* To whom correspondence should be addressed. E-mail: m4497147{at}msic.med.osaka-cu.ac.jp.

Background--Elevated serum C-reactive protein (CRP) is of clinical significance in the management of acute coronary syndromes, but there have been few in vivo studies detailing the relation between lesion morphology and elevated CRP in the setting of acute myocardial infarction (AMI). In this study, we investigated the relation between lesion morphology as seen under preintervention intravascular ultrasound (IVUS) and CRP in the acute phase of AMI.

Methods and Results--Our patient population comprised 90 consecutive patients with AMI who underwent preintervention IVUS within 6 hours of the onset of symptoms. Patients were divided into an elevated CRP group (3 mg/L) or a normal CRP group on the basis of serum CRP levels. There were no differences in patient characteristics or angiographic findings. We observed significantly more plaque rupture in the elevated CRP group than in the normal CRP group (70% versus 43%, P=0.01). A multivariate logistic regression model revealed that the presence of ruptured plaque alone correlated with elevation of serum CRP (P=0.02; odds ratio, 3.35; 95% CI, 1.22 to 9.18).

Conclusions--Elevated CRP may be related to the presence of ruptured plaque. Our results suggest that in the setting of AMI, elevated CRP levels may reflect the inflammatory activity of a ruptured plaque.

Key words: inflammation • plaque • myocardial infarction • ultrasonics

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