Key result
Severe hyperkalemia can occur without classic ECG changes, indicating ECG cannot reliably exclude profound levels.
Why the study?
Profound elevations of serum potassium generally produce classic ECG manifestations, but the reliability of ECG to detect severe hyperkalemia is uncertain.
Design
Case report
Authors
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ECG should not defer potassium testing in high-risk patients; single case leaves open true incidence of ECG-silent hyperkalemia.
Case Report (n=2)
Even with profound serum potassium elevations (>9.0 mEq/L), the ECG cannot reliably be used to exclude hyperkalemia.
Szerlip et al. (1986) conducted a case report in Severe hyperkalemia (n=2). Severe hyperkalemia was evaluated on ECG manifestations of hyperkalemia. Severe hyperkalemia (>9.0 mEq/L) can occur without classic electrocardiographic manifestations, indicating the ECG cannot reliably exclude profound hyperkalemia.
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