Table 3.

Echocardiographic thrombus description at initial diagnosis and response to alteplase for the five patients.

Case	Site	Age of thrombus	Size (mm)	Severity of obstruction	Thrombus resolution	Safety outcomes
A	Fontan lateral tunnel	Fresh	2.5×3.7	Moderate	Complete	Minor bleeding
			1.7×2.3	Mild
			None	None
B	Anterior leaflet of the tricuspid valve	Fresh	1×0.5	None	Complete	Minor bleeding
			0.4×0.1	None
			None	None
Ca	Left internal jugular vein	Old	Total occlusion	Severe	Negligible	Major bleeding
			1×1	Moderate
D	Superior vena cava	Fresh	0.8×0.9	Moderate	Partial	Major bleeding
			0.8× 0.8	Mild
E	Superior vena cava	Old	1.5×1.1	Total	Negligible	Major bleeding and death
			1.5×1.1	Subtotal

^aBy Doppler ultrasound