Angiographic study of the vortex vein circulation.

Area of Science:

• Ophthalmology
• Medical Imaging
• Vascular Biology

Background:

• Vortex veins are crucial for choroidal circulation.
• Accurate in vivo measurement of vortex vein filling is essential for understanding ocular hemodynamics.
• Current methods may lack precision in dynamic filling pattern assessment.

Purpose of the Study:

• To evaluate the feasibility of using indocyanine green (ICG) choroidal angiography for in vivo vortex vein filling pattern measurement.
• To establish normal filling times for temporal vortex veins in healthy subjects.
• To provide a baseline for future studies on vortex vein abnormalities.

Main Methods:

• Employed Flower's method of choroidal angiography utilizing indocyanine green dye.
• Studied eight eyes from six healthy volunteers.
• Monitored and timed the dye's appearance and peak fluorescence in vortex veins relative to choroidal arteries.

Main Results:

• Successfully visualized and measured the filling pattern of vortex veins in vivo.
• The dye was first observed in temporal vortex veins approximately 1.2 seconds after the initial filling of corresponding radial choroidal arteries.
• Maximum fluorescence of the vortex veins was observed within 5 seconds.

Conclusions:

• Indocyanine green (ICG) choroidal angiography is a viable method for measuring vortex vein filling patterns in vivo.
• Normal temporal vortex vein filling occurs rapidly, within seconds of arterial filling.
• This technique provides a valuable tool for assessing ocular vascular function.