Clinical Manifestations of Hyperkalemia

Serum potassium refers to the concentration of potassium ions in serum—the liquid component of blood remaining after removal of blood cells and fibrinogen. Some individuals may develop hyperkalemia (elevated serum potassium levels). What, then, are the clinical manifestations of hyperkalemia?

Clinical Manifestations of Hyperkalemia

The primary clinical manifestations of hyperkalemia involve the cardiovascular system. These may include muffled heart sounds, bradycardia (slowed heart rate), atrioventricular (AV) conduction block, and—in severe cases—ventricular fibrillation or cardiac arrest. Electrocardiography (ECG) is a critical diagnostic tool for hyperkalemia. When serum potassium exceeds 6 mmol/L, characteristic ECG changes such as tall, peaked T waves may appear. As serum potassium levels progressively rise, additional sequential ECG abnormalities develop. Early in hyperkalemia, blood pressure may transiently increase; however, in advanced stages, hypotension may occur, accompanied by vasoconstriction and ischemic symptoms.

Patients may also exhibit pallor and cold, clammy skin, as well as numbness and aching in the extremities. Due to impaired neuromuscular membrane potential, patients may experience fatigue, flaccid paralysis of the limbs, diminished or absent deep tendon reflexes, slowed movements, and even drowsiness or other neurological symptoms. Prompt treatment of hyperkalemia is essential to prevent life-threatening complications.

Hyperkalemia most commonly results from renal disease impairing potassium excretion—for example, in early acute kidney injury or end-stage chronic kidney disease. Other potential causes include malignancies, severe burns, shock, or metabolic acidosis. We hope this article has been helpful to you!