Sinus Node Dysfunction with Pulmonary Edema Associated with Hyponatremia

Hyponatremia is the most common electrolyte abnormality in hospitalized patients and often presents no symptoms. The association between sinus node dysfunction and hyponatremia has rarely been reported. We describe a 77-year-old woman who developed reversible sinus node dysfunction accompanied by pulmonary edema that was associated with hyponatremia. (Korean J Med 2016;90:444-448)