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Related Concept Videos

Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Updated: Mar 10, 2026

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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Hyperkalemia from Dietary Supplements.

Vivek Batra1, Vipin Villgran1

  • 1Johns Hopkins Community Physicians, The Johns Hopkins Hospital.

Cureus
|December 8, 2016
PubMed
Summary
This summary is machine-generated.

Hyperkalemia is a common issue in chronic kidney disease, often from medications. Salt substitutes and supplements are under-recognized causes, highlighting the need for dietary history in managing electrolyte disorders.

Keywords:
arrhythmiaschronic kidney diseasehyperkalemiasupplements

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Area of Science:

  • Nephrology
  • Internal Medicine
  • Clinical Nutrition

Background:

  • Hyperkalemia is a frequent electrolyte disturbance in patients with chronic kidney disease (CKD).
  • Medications are the primary cause of hyperkalemia in individuals with impaired kidney function.
  • Comorbidities like heart failure and diabetes increase susceptibility to electrolyte imbalances.

Observation:

  • Salt substitutes and dietary supplements are infrequently identified as causes of hyperkalemia.
  • This study proposes that these dietary factors are under-recognized and underdiagnosed in CKD patients.
  • A case report and literature review were conducted to investigate this hypothesis.

Findings:

  • The case report and literature review suggest a link between salt substitutes/dietary supplements and hyperkalemia in CKD.
  • These dietary sources may contribute significantly to elevated potassium levels, particularly when kidney function is compromised.
  • Underdiagnosis may stem from a lack of routine inquiry into specific dietary supplement and salt substitute use.

Implications:

  • A thorough dietary history, including the use of salt substitutes and supplements, is crucial for diagnosing hyperkalemia in CKD patients.
  • Clinicians should consider these less common causes when evaluating electrolyte disorders.
  • Improved diagnostic approaches can lead to better management of hyperkalemia and potentially prevent severe complications in CKD patients.