Figure 4. Contrast defect (CD) changes in association with the
CT position and scanning phase.
This patient was administered apixaban for more than 3 months for
persistent atrial fibrillation. Contrast computed tomography (CT) in the
supine position was performed, and a CD was detected in both the early
and late phases (A, B). The patient was intolerant to transesophageal
echocardiogram due to difficulties in swallowing the echo probe. A week
from CT performed in the supine position, CT in the prone position was
performed under the same anticoagulant type and dose conditions. A CD
was only detected using CT in the early phase (C), but not in the late
phase (D). Arrows show CDs, and arrowheads show residual contrast.