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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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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
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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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Obstructive Sleep Apnea and Circulating Potassium Channel Levels.

Ning Jiang1, Anyu Zhou1, Bharati Prasad2

  • 1Lifespan Cardiovascular Institute, Brown University, Providence, RI.

Journal of the American Heart Association
|August 21, 2016
PubMed
Summary

Obstructive sleep apnea (OSA) is linked to reduced potassium channel mRNA in white blood cells, increasing cardiac risks. Continuous positive airway pressure therapy partially restored these channels in moderate OSA patients.

Keywords:
arrhythmiagene regulationhypoxiaion channelpotassium‐channelsleep apnea

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Area of Science:

  • Cardiology
  • Sleep Medicine
  • Molecular Biology

Background:

  • Obstructive sleep apnea (OSA) is associated with increased cardiac arrhythmias and sudden cardiac death.
  • QT prolongation, a risk factor for sudden cardiac death, is linked to OSA.
  • Potassium channel dysfunction may mediate QT prolongation in OSA.

Purpose of the Study:

  • To investigate the impact of OSA and continuous positive airway pressure (CPAP) therapy on the mRNA expression of potassium channels in circulating white blood cells.

Main Methods:

  • Compared potassium channel mRNA levels in white blood cells of 28 OSA patients and 6 controls.
  • Assessed correlations between OSA severity (apnea-hypopnea index, oxygen desaturation index) and potassium channel mRNA expression.
  • Evaluated changes in potassium channel mRNA after 4 weeks of CPAP therapy in OSA patients.

Main Results:

  • Significant inverse correlations were found between OSA severity and mRNA expression of KCNQ1, KCNH2, KCNE1, KCNJ2, and KCNA5.
  • KCNQ1, KCNH2, and KCNE1 mRNA levels inversely correlated with the oxygen desaturation index.
  • CPAP therapy increased circulating KCNQ1 and KCNJ2 mRNA by 1.4-fold and 2.1-fold, respectively, in moderate OSA patients.

Conclusions:

  • Potassium channel mRNA expression in white blood cells is inversely related to OSA severity and hypoxemia.
  • CPAP therapy can improve the expression of KCNQ1 and KCNJ2 in patients with moderate OSA.