In some cases, acute myocarditis leads to long-term heart problems in children, especially if not properly diagnosed and treated. This may include the development of heart rhythm disturbances, weakened heart function, and an increased risk of heart failure. It is also possible for acute myocarditis to trigger the development of other heart conditions, such as dilated cardiomyopathy, which is a condition that causes the heart to become enlarged and weakened. It is important for children with a history of acute myocarditis to be closely monitored by a healthcare provider to ensure that any potential complications are detected and managed promptly.