Severe bradycardia caused by diabetic ketoacidosis.

Atrial standstill is an uncommon but serious clinical entity that is often unrecognised in the clinical setting. Its diagnosis and treatment should be swift as malignant arrhythmias and thromboembolic complications can arise. We present a 79-year-old man brought to our emergency department with acute confusion, heart failure and severe bradycardia in the context of diabetic ketoacidosis, and discuss the diagnosis and management of this arrhythmic condition.