Dear readers,In 2017, John Fetterman, then the mayor of Braddock, Pennsylvania (population 1,721), was diagnosed with atrial fibrillation. This is a serious but common cardiac condition that raises the risk of stroke and can be effectively treated with medication and lifestyle modifications. Fetterman did respond to this diagnosis by losing weight but he didn’t follow up with his cardiologist or take prescribed medication, and five years later h…