Related Experiment Video
Updated: Jun 18, 2026
06:08
A Novel Method: Super-selective Adrenal Venous Sampling
Published on: September 15, 2017
Life-threatening arrhythmia caused by primary aldosteronism
Tomás Zelinka1, Robert Holaj, Ondrej Petrák
13rd Medical Department of the 1st Faculty of Medicine and General Teaching Hospital, Prague, Czech Republic.
Summary
Primary aldosteronism can cause dangerous arrhythmias, even in patients without heart disease. Early diagnosis and treatment of primary aldosteronism can prevent the need for implantable cardioverter defibrillators.
Area of Science:
- Cardiology
- Endocrinology
Background:
- Primary aldosteronism (PA) is a condition often associated with hypertension and hypokalemia.
- Arrhythmias are recognized complications of primary aldosteronism.
Observation:
- This report details three cases where primary aldosteronism presented as life-threatening arrhythmias.
- In two cases, implantable cardioverter defibrillators were implanted before PA diagnosis, following episodes of polymorphic ventricular tachycardia and hypokalemia.
Findings:
- Primary aldosteronism should be considered in hypertensive patients with malignant arrhythmias and hypokalemia, especially when structural heart disease is absent.
- Delayed diagnosis of primary aldosteronism can lead to invasive cardiac device implantation.
Implications:
- Integrating primary aldosteronism screening into the diagnostic process for unexplained arrhythmias can improve patient outcomes.
- Effective management of primary aldosteronism may obviate the need for implantable cardioverter defibrillators, reducing healthcare costs and patient morbidity.
Related Concept Videos
01:29Disturbances in Heart Rhythm
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
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 indirectly block calcium...
01:28Mechanism of Cardiac Arrhythmias
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
01:16ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism, and...
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism, and...
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
01:28Antihypertensive Drugs: Potassium-Sparing Diuretics
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...