Platelet distribution width (PDW) measures the variability in platelet size and is a marker of platelet activation. We investigated whether PDW is associated with the extent of coronary artery disease (CAD) and coronary total occlusions (CTOs). We studied 162 patients: 108 had a coronary lesion with a diameter stenosis of ≥50%, the CAD(+) group, and 54 patients had normal coronary anatomy, the CAD(−) group. The CAD(+) group was subdivided into CAD(+) CTO(+) and CAD(+) CTO(−) groups. Among patients with CAD, the CTO(+) group had a significantly greater PDW (%) than the CTO(−) group (16.9 ± 2.8, 15.4 ± 3.0, and 15.4 ± 1.9, respectively; P = .008). In a receiver–operating characteristic analysis, a PDW cut point of 15.7% was identified in patients with CTO(+) (area under curve = 0.64, 95% confidence interval 0.54-0.75). A PDW value of more than 15.7% demonstrated a sensitivity of 64% and a specificity of 66%. The PDW is a simple platelet index that may predict the presence of CTO.
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