Carly Pearce needs to make “adjustments” to her live shows to accommodate her heart condition. The country singer recently revealed she has been diagnosed with the rare but treatable pericarditis – inflammation of the tissue surrounding the heart – and while she’s happy to be performing on Tim McGraw’s ‘Standing Room Only’ tour, it is important for her to take extra precautions so the shows don’t take too much of a toll on her body. She told ‘Entertainment Tonight’: “I kind of have to make adjustments just because my heart rate quite literally cannot get above a certain point.” “Fans have been…