Disorders of potassium.

Potassium disorders are the most common electrolyte abnormality identified in clinical practice. Presenting symptoms are similar for both hypo- and hyperkalemia, primarily affecting the cardiac, neuromuscular, and gastrointestinal systems. Generally, mild hypokalemia is the most common potassium disorder seen clinically;however, severe complications can occur. Hyperkalemia is less common but more serious, especially if levels are rising rapidly. The etiologies and treatments for both hypo- and hyperkalemia are discussed, with special emphasis on the role medications play in the etiologies of each.