Optional medical device diagnostics – depending on the results of the history, physical examination, laboratory diagnostics, and obligatory medical device diagnostics – for differential diagnostic clarification.
- Radiographs of the affected joints
- Electrocardiogram (ECG; recording of the electrical activity of the heart muscle) [minor criterion: prolonged PQ or PR time].
- Echocardiography (echo; cardiac ultrasound) – if structural heart disease is suspected.