Genetic testing could help better guide doctors’ use of warfarin, new research suggests. The blood-thinning medication is widely used to prevent stroke and heart attack in people with irregular heartbeats. Robert Giugliano, HMS associate professor of medicine at Brigham and Women’s Hospital, is the lead author of a study cited in the article. Joseph Loscalzo, the Hersey Professor of the Theory and Practice of Physic and chair of the Department of Medicine at Brigham and Women’s Hospital, and Patrick Ellinor, HMS associate professor of medicine at Massachusetts General Hospital, are also quoted.