Study ties long-haul COVID-19 with chronic fatigue, breathing problemsMany COVID-19 survivors experience impaired circulation, abnormal breathing patterns, and chronic fatigue syndrome an average of 9 months after diagnosis, finds a small, single-center study yesterday in JACC: Heart Failure.In the first study to link long-haul COVID-19 with chronic fatigue syndrome, researchers from the Icahn School of Medicine at Mount Sinai used cardiopulmonary exercise testing (CPET) and symptom reports to find the causes of shortness of breath in 23 women and 18 men with long-haul COVID.Shortness of breath is a common symptom in the roughly 20% of COVID-19 survivors with long-haul COVID, the authors noted.