How do you approach cases of transient monocular vision loss when initial carotid imaging and cardiac workup are unrevealing?   

As you eluded, it is essential to rule out amaurosis fugax in a case of TMVL, and carotid Doppler and cardiac echo are two essential tests to evaluate the two potential sources of embolization in this setting. I would also recommend an MRI of the brain (to check for possible evidence of other ische...