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.