Peter M. Rothwell, PhD

We assessed the histologic features of 526 carotid plaques from consecutive patients undergoing endarterectomy for symptomatic carotid stenosis and found a high prevalence of coronary-type plaque instability, with strong correlations between macrophage infiltration and both cap rupture and time since stroke. Temporal trends were much weaker after a transient ischemic attack than after a stroke, with a tendency for plaque features to persist for a longer period, suggesting heterogeneity in the underlying pathological mechanisms.