Bioprosthetic heart valves often express foreign sugars that trigger a response from the body's immune system. This immune response appears to be associated with calcification. 

Researchers examined Medicare data from 2016 to 2018, presenting their findings in Circulation: Cardiovascular Interventions. 

Researchers reviewed data from more than 900 patients, sharing their research in the American Journal of Cardiology.

Researchers focused on 30-day outcomes, sharing their findings in the American Journal of Cardiology.

TAVR was associated with a consistently low risk of all-cause mortality or disabling stroke.

One previous study had suggested outcomes may improve in the afternoon, but researchers did not find that to be the case. 

TAVR-related stroke, the authors wrote, is a "critically important and potentially preventable source of patient morbidity."