Mild hyperkalemia clinical manifestations

Written by Gan Jun

Endocrinology

Updated on November 01, 2024

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When blood potassium exceeds 5.5 millimoles per liter, it is referred to as hyperkalemia. Clinically, mild manifestations of hyperkalemia commonly involve the cardiovascular system, including bradycardia, audible enlargement of the heart, and weakened heart sounds. The electrocardiogram may show a shortened QT interval and peaked T waves. Symptoms related to the neuromuscular system include numbness in the lips and limbs, muscle soreness, and, in severe cases, paralysis of the respiratory muscles, which can lead to suffocation. All cases of hyperkalemia present various degrees of metabolic acidosis or azotemia, among other symptoms.

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Written by Tang Zhuo

Endocrinology

1min 28sec

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Hyperkalemia is seen in which diseases?

When serum potassium levels exceed 5.5 millimoles per liter, it is referred to as hyperkalemia. Elevated serum potassium does not reflect an overall increase in body potassium, but due to limitations in testing methods, the clinical diagnosis of hyperkalemia still relies on combining serum potassium levels with electrocardiogram history. The causes of hyperkalemia are complex and commonly include: First, decreased renal potassium excretion, seen in acute kidney failure or insufficiency in adrenal cortical hormone synthesis and secretion, or long-term use of potassium-sparing diuretics; Second, shifts of potassium from inside the cells, often due to hemolysis, tissue damage, large-scale necrosis of tumors and inflammatory cells, shock, burns, excessive muscle contractions, acidosis, or injection of hypertonic saline or mannitol, which causes dehydration inside cells and leads to potassium leakage, resulting in hyperkalemia; Third, excessive intake of potassium-containing medications, such as high doses of potassium penicillin; Fourth, transfusion of stored blood can lead to hyperkalemia; Fifth, digitalis poisoning can cause hyperkalemia.

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Written by Wei Shi Liang

Intensive Care Unit

56sec

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What are the causes of hyperkalemia?

Hyperkalemia, with blood potassium levels greater than 5.5 mmol/L, commonly occurs due to decreased potassium excretion or abnormal potassium transport within cells, as well as other reasons such as excessive intake. Decreased potassium excretion can commonly be due to renal failure, the use of potassium-sparing diuretics, renal tubular acidosis, and reduced secretion of corticosteroid aldosterone. Abnormal potassium transport includes conditions such as acidosis, rhabdomyolysis, extensive burns, severe trauma, intestinal necrosis, and peritoneal bleeding, among other diseases. Excessive potassium intake can be due to sample hemolysis or an elevation in white blood cells, both of which can lead to hyperkalemia. Therefore, it is crucial to be vigilant in clinical settings and address the condition promptly and appropriately.

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Written by Wei Shi Liang

Intensive Care Unit

49sec

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Why does hyperkalemia cause acidosis?

The concentration of potassium ions in serum is 3.5 to 5.5 millimoles per liter, and concentrations above 5.5 millimoles per liter are considered hyperkalemia. In the state of hyperkalemia, potassium ions in the extracellular fluid move into the intracellular fluid, while hydrogen ions in the intracellular fluid move to the extracellular fluid. At this time, through a compensatory mechanism, there is an increase in hydrogen ions in the extracellular fluid, significantly higher than normal levels, resulting in acidosis. Therefore, hyperkalemia often accompanies metabolic acidosis, which in turn affects the renal tubular epithelial cells, causing an abnormal alkaline urine. This is the main reason why hyperkalemia leads to acidosis.

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Written by Wei Shi Liang

Intensive Care Unit

45sec

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The effect of hyperkalemia on the myocardium

The primary mechanism by which hyperkalemia causes arrhythmias is due to dysfunction of myocardial conduction, which is also related to various other factors such as other myocardial lesions, failure, and ionic states. The main impact on the myocardium is on its excitability; myocardial excitability can decrease or even disappear, and its conductivity is also affected, causing a reduction in conductivity. The effect on myocardial automaticity is a decrease in automaticity. Electrocardiographically, there are manifestations such as a low P wave, prolonged PR interval, and widened QRS complex without disappearance; these are some of the presentations of hyperkalemia.

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Written by Chen Li Ping

Endocrinology

58sec

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How is hyperkalemia treated?

For hyperkalemia, commonly used clinical treatments include firstly diuretics, which increase the excretion of potassium, thus increasing its discharge from the body. Additionally, hypertonic glucose with insulin is used intravenously to facilitate the movement of potassium from outside to inside the cells. Sodium bicarbonate can also be used to correct acidosis, which can likewise reduce blood potassium levels. When hyperkalemia causes ventricular arrhythmias, calcium injections should be administered immediately to counteract the cardiac toxicity of high potassium. If these treatments do not result in significant effects and the condition is critical, emergency hemodialysis or peritoneal dialysis can be performed to lower blood potassium levels. (Medication should be administered under the guidance of a doctor.)