good cardiac doctors near me Myocarditis: Inflammation of the heart muscle (myocardium) is one of the more serious but rare complications. Symptoms: Chest pain, shortness of breath, palpitations. Can be diagnosed via electrocardiogram (ECG) changes, elevated cardiac biomarkers like troponins, and imaging studies. 2. Arrhythmias: Abnormal heart rhythms such as bradycardia (slow heart rate) or tachycardia (rapid heart rate) can occur. These arrhythmias are generally transient but may require monitoring. 3. Pericarditis: Inflammation of the pericardium (the sac around the heart). Symptoms: Sharp chest pain that worsens with breathing or lying down. Can lead to pericardial effusion (fluid accumulation), which might require intervention in severe cases.