Branch Retinal Artery Occlusion - Pathophysiology. 1  Most commonly, a branch retinal artery occlusion occurs secondary to an embolus. Emboli typically originate within vessels upstream where they dislodge and travel within the circulatory system to ultimately become lodged downstream in a vessel with a smaller lumen.
Ragtime is a musical form or style that is defined as a syncopated melody (usually in 2/4 time) over a regular, march tempo bass line. Improvisation was common but little of that aspect has been preserved.
A rag written in 3/4 time is a ragtime waltz. Ragtime is not a time (meter) in the same sense that march time is 2/4 meter and waltz time is 3/4 meter; it is rather a musical style that uses an effect that can be applied to any meter.