Furthermore, the His bundle electrogram (HBE) showed either regular, high frequency deflictions or irregular, deformed potentials, suggesting flutter and fibrillation-like phenomena in the His bundle. [ncbi.nlm.nih.gov]

Patients with atrial standstill were older (P 0.036), had lower diastolic blood pressure (DBP; P CONCLUSIONS: Hyponatremia and decline in DBP are associated with atrial standstill in patients with hyperkalemia. (Circ J 2016; 80: 1781-1786). [ncbi.nlm.nih.gov]

Talwar, et al. [8] reported a case series in which two of the patients had lymphocytic infiltrates on right ventricular endomyocardial biopsy. [indianpediatrics.net]