After a common heart surgery, some patients experience migraines with visual auras — temporary vision disturbances, such as flashing lights and zigzag lines. The reason for this unusual complication was a mystery, but now, research hints that blood clots in the brain may be the culprit.
"These [clots] have previously not been thought to result in any symptoms or to have any clear adverse consequences," study co-author Dr. Gregory Marcus, a cardiologist at the University of California, San Francisco, told Live Science in an email.
