ECG - Nonspecific ST-T changes may be observed in persons with myopericarditis. Severe disease may cause Q waves, ventricular tachyarrhythmias, and heart block. ECG findings may demonstrate evolution through several stages of myopericarditis, as follows:
- Stage I - Diffuse ST elevation with PR depression
- Stage II - Normalization of ST and PR segments
- Stage III - Deep symmetric inversion of T waves
- Stage IV - May revert to normal or permanent T-wave inversions
Electroencephalography - This test may be useful for evaluating the extent and severity of illness in patients with encephalitis.
Ophthalmic slit-lamp examination - In persons with Acute Hemorrhagic Conjuctivitis (AHC), corneal erosions may be visualized using a flrescein stain. Enterovirus 70 and coxsackievirus A24 can be recovered from conjunctival swabs during the first 3 days of infection.