Coronary no-reflow is caused by shedding of active tissue factor from dissected atherosclerotic plaque.

Blood
Diana BondermanIrene M Lang

Abstract

Defined angiographically, no-reflow (NR) manifests as an acute reduction in coronary flow in the absence of epicardial vessel obstruction. One candidate protein to cause coronary NR is tissue factor (TF), which is abundant in atherosclerotic plaque and a cofactor for activated plasma coagulation factor VII. Scrapings from atherosclerotic carotid arteries contained TF activity (corresponding to 33.03 +/- 13.00 pg/cm(2) luminal plaque surface). Active TF was sedimented, indicating that TF was associated with membranes. Coronary blood was drawn from 6 patients undergoing coronary interventions with the distal protection device PercuSurge GuardWire (Traatek, Miami, FL). Fine particulate material that was recovered from coronary blood showed TF activity (corresponding to 91.1 +/- 62.16 pg/mL authentic TF). To examine the role of TF in acute coronary NR, blood was drawn via a catheter from coronary vessels in 13 patients during NR and after restoration of flow. Mean TF antigen levels were elevated during NR (194.3 +/- 142.8 pg/mL) as compared with levels after flow restoration (73.27 +/- 31.90 pg/mL; P =.02). To dissect the effects of particulate material and purified TF on flow, selective intracoronary injection of atherosclerotic m...Continue Reading

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