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J Electrocardiol. 1999 Jan;32(1):45-9.

Severe hyperkalemia with minimal electrocardiographic manifestations: a report of seven cases.

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Hospital Universitario de Tarragona Joan XXIII, Department of Medicine and Surgery, University Rovira i Virgili, Spain.


Severe hyperkalemia with minimal or nonspecific electrocardiographic (ECG) changes is unusual. We report data on seven patients with renal failure, metabolic acidosis, and severe hyperkalemia (K+ > or =8 mmol/L) without typical ECG changes. Initial ECGs revealed sinus rhythm and PR and QT intervals in the normal range. QRS intervals were slightly prolonged in two patients (110 ms), and incomplete right bundle branch block was evident in one. Thus, the absence of typical ECG changes does not preclude severe hyperkalemia.

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