Excessively high blood concentration of potassium.
A condition in which too much potassium occurs in the blood, which can result in cardiac arrest. Various possible causes include kidney failure and chemotherapy.
A concentration of potassium in the plasma that is above the normal range. It is often caused by renal failure or by excessive intake of potassium perhaps in drug form and may cause dangerous cardiac dysrhythmia (abnormal rhythm of the heart).
Hyperkalemia refers to the condition of having abnormally high blood levels of potassium, often occurring when the kidneys fail to excrete it properly. If severe, hyperkalemia can result in a potentially fatal irregularity of the heart rhythm.