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Severe hyperkalaemia with normal electrocardiogram.
1Department of Medicine, Royal Gwent Hospital, Newport, Gwent.
International Journal of Clinical Practice
|October 12, 2001
Summary
Persistent high serum potassium levels without EKG or biochemical changes suggest pseudohyperkalemia. This case highlights essential thrombocytosis as a cause, linked to platelet fragility and potassium leakage.
Area of Science:
- Hematology
- Clinical Biochemistry
Background:
- Pseudohyperkalemia, characterized by elevated serum potassium without clinical or electrocardiographic abnormalities, can be mistaken for true hyperkalemia.
- Thrombocytosis, a condition of elevated platelet counts, is an under-recognized cause of pseudohyperkalemia due to in vitro potassium release.
Observation:
- A case study of an apparently healthy female presenting with persistent, unexplained hyperkalemia.
- Initial investigations revealed elevated serum potassium levels, but lacked typical signs of true hyperkalemia such as electrocardiographic changes or significant biochemical alterations.
Findings:
- The persistent hyperkalemia was attributed to pseudohyperkalemia.
- Further investigation identified essential thrombocytosis as the underlying cause, stemming from increased platelet fragility and subsequent in vitro potassium leakage.
Implications:
- This case underscores the importance of considering pseudohyperkalemia in the differential diagnosis of hyperkalemia, especially in asymptomatic individuals.
- Recognizing thrombocytosis as a cause of pseudohyperkalemia can prevent unnecessary investigations and treatments for true hyperkalemia, guiding towards appropriate hematological evaluation.