Hyperkalemia Severity Criteria

Classification by Potassium Level

The European Society of Cardiology recommends classifying hyperkalemia into three levels of severity based on serum potassium concentration: mild (>5.0 to <5.5 mEq/L), moderate (5.5 to 6.0 mEq/L), and severe (>6.0 mEq/L) 1, 2
Mild hyperkalemia is often asymptomatic, particularly in patients with chronic kidney disease, diabetes, or heart failure 1
Moderate hyperkalemia is associated with an increased risk of cardiac arrhythmias, but this risk varies among patients 1
Severe hyperkalemia constitutes a medical emergency requiring immediate treatment 3

The severity of hyperkalemia depends not only on the level of serum potassium but also on the presence of clinical and electrocardiographic manifestations 3
The presence of certain comorbidities or clinical situations significantly increases the risk of life-threatening arrhythmias, even at moderately elevated potassium levels 1
Insufficiency renal advanced (eGFR <30 mL/min) is a factor that aggravates the severity of hyperkalemia 1
The use of digitalis, acidosis, and the use of medications that affect potassium homeostasis are also factors that increase the risk of arrhythmias 1

Acute hyperkalemia is defined as a serum potassium concentration exceeding the upper limit of normal without a known history of chronicity 3
Chronic or recurrent hyperkalemia is defined as potassium levels >5 mEq/L measured repeatedly over a period of one year 1

To evaluate the severity of hyperkalemia, follow a systematic approach that includes checking the serum potassium level, performing an immediate ECG, evaluating the presence of symptoms, and identifying aggravating factors 1, 3
Classify the urgency of treatment based on the serum potassium level, ECG changes, symptoms, and aggravating factors 3
The European Heart Journal recommends surveillance and treatment strategies based on the level of urgency 1, 2