Beatrice Lang
The human heart is a complex organ, with electrical impulses travelling through it to make it beat. When these electrical impulses are disrupted, it can cause an irregular heartbeat, known as an arrhythmia. There are many causes of arrhythmias, including genetics, heart disease, high blood pressure, diabetes, medications, and lifestyle factors such as excessive alcohol or caffeine consumption. Some conduction disorders that can cause arrhythmias include bundle branch block, heart block, and Long QT Syndrome (LQTS). Heart block, for example, occurs when the electrical impulses that pass between the heart's upper and lower chambers are slower or impaired, causing the heart to beat irregularly. LQTS can cause abnormal heart rhythms in response to exercise or stress, and it can be hereditary. Arrhythmias can be detected and diagnosed through various methods, including ECG devices, event monitors, and echocardiograms, and treated through lifestyle changes, medications, cardiac procedures, or surgery.
| Characteristics | Values |
|---|---|
| Common conduction disorders | Bundle branch block, heart block, Long QT Syndrome (LQTS) |
| Cause of first-degree heart block | Medication side effect, e.g. Digitalis, Beta blockers, Calcium channel blockers |
| Cause of Long QT Syndrome | Exercise or stress |
| Cause of bundle branch block | Age |
| Cause of third-degree heart block | Mother with a connective tissue disorder |
| Cause of Brugada syndrome | Genetics, more common in people of Asian descent |
| Cause of arrhythmias | Problems with the heart's electrical system |
| Cause of atrial fibrillation | Abnormal electrical impulses in the top chambers of the heart |
| Cause of electrical heart disorders | Genetics, heart disease, high blood pressure, diabetes, medications, lifestyle factors |
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What You'll Learn
Genetics and family history
A person's genetics and family history can play a significant role in the development of heart electrical system malfunctions. Certain genetic mutations and inherited conditions can increase the risk of electrical disorders of the heart.
One such condition is Long QT Syndrome (LQTS), which is a disorder of the heart's electrical system that can cause abnormal heart rhythms in response to exercise, stress, or emotional outburst. LQTS has been shown to have a genetic basis, with specific genes such as ANK2 and CACNA1C implicated in the disorder. It can be inherited, appearing in otherwise healthy individuals, and is known to run in families. While it may manifest infrequently, when it does occur, it typically affects children or young adults.
Another example is Brugada syndrome, a rare conduction disorder characterised by rapid and irregular heartbeats. This syndrome is also associated with genetic factors, specifically mutations in the SCN5A gene, which encodes for the alpha subunit of the cardiac sodium channel. Brugada syndrome is more common in people of Asian descent, particularly those of Japanese, Thai, and Filipino heritage.
Additionally, some individuals are born with conduction disorders, while others develop them later in life. Certain conduction disorders, such as third-degree heart block, are more prevalent in babies whose mothers have a connective tissue disorder. Bundle branch block, on the other hand, becomes more common as people age.
Genetic screening of asymptomatic family members is possible due to the identification of the genes responsible for these conditions. This screening can help identify those at risk and potentially prevent sudden cardiac death.
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Heart block
First-degree heart block occurs when electrical impulses move through the heart's AV node slower than normal, resulting in a slower heart rate. It rarely causes symptoms and may not need treatment. However, certain medications, such as Digitalis, beta-blockers, and calcium channel blockers, can cause first-degree heart block as a side effect.
Second-degree heart block is when the heart's electrical signals intermittently fail to reach the bottom chambers, causing "dropped beats" and requiring medical intervention. There are two types of second-degree heart block: Mobitz type I, where signals progressively slow down between beats, eventually leading to skipped beats; and Mobitz type II, where signals sometimes reach the ventricles, and sometimes don't, without progressive slowing.
Third-degree heart block, also known as complete heart block, is the most severe form. It occurs when electrical impulses from the upper chambers cannot pass to the lower chambers at all, resulting in a dangerously slow pulse or even no pulse. Treatment for third-degree heart block may involve a temporary or permanent pacemaker to regulate the heart rhythm.
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Long QT syndrome
LQTS is a rare disorder that can be inherited or acquired. Inherited LQTS is a lifelong condition that individuals are born with, while acquired LQTS is developed during an individual's lifetime and can be caused by conditions, medications, or events that prolong the QT interval. Although LQTS is rare, it can be fatal when abnormal heart rhythms occur. The risk of abnormal heart rhythms may lessen as individuals with LQTS get older, especially in men after the age of 40. In boys with LQTS, the QT interval often returns to normal after puberty, reducing the risk of symptoms and complications.
The ion channels on the surface of each heart muscle cell play a crucial role in LQTS. These ion channels open and close to allow electrically charged sodium, calcium, and potassium ions to flow into and out of each cell, generating the heart's electrical activity. In people with LQTS, the ion channels may not function properly or there may be an insufficient number of them, leading to disrupted electrical activity in the ventricles and potentially causing dangerous arrhythmias.
Diagnosis of LQTS typically involves a thorough evaluation of an individual's medical history, family medical history, symptoms, and medications. Physical examinations and various tests, including blood tests, genetic testing, and heart tests such as EKGs, are also employed to confirm the presence of LQTS. Treatment focuses on preventing arrhythmias and fainting spells, although it may not restore a normal QT interval. In some cases, discontinuing certain medications or addressing underlying conditions can help resolve acquired LQTS.
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Lifestyle factors
Excessive Alcohol Consumption
Alcohol is a depressant that can negatively impact the heart's electrical system. Excessive alcohol intake can disrupt the normal electrical impulses in the heart, leading to arrhythmias or irregular heartbeats. This disruption can cause the heart to beat too fast (tachycardia) or too slow (bradycardia), posing potential health risks.
Caffeine Intake
Caffeine, a stimulant found in coffee, tea, and some soft drinks, can affect the heart's electrical system. Excessive caffeine consumption can increase the heart rate and impact the normal electrical conduction in the heart. This alteration can lead to arrhythmias and palpitations, causing an irregular heartbeat and potentially more severe complications.
Stress and Emotional Outbursts
Stress and emotional outbursts can trigger electrical malfunctions in the heart. During these episodes, the body releases a surge of adrenaline, which can affect the heart's electrical impulses. This disruption can result in arrhythmias, causing the heart to beat too fast or irregularly. In some cases, stress and emotional outbursts can lead to more severe consequences, such as a rapid heartbeat that may require medical intervention.
Sleep
Disturbances in sleep patterns can also impact the heart's electrical system. During sleep, the body's natural repair processes are active, and any disruptions can affect the normal functioning of the heart. Sleep disorders or insufficient sleep can increase the risk of arrhythmias and irregular heartbeats, leading to potential health complications.
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Illnesses and medical conditions
Some people are born with conduction disorders, while others develop them later in life. Certain conduction disorders, such as third-degree heart block, are more common in babies whose mothers have connective tissue disorders. Additionally, Brugada syndrome, a rare conduction disorder, is more prevalent in people of Asian descent, particularly those of Japanese, Thai, or Filipino heritage. Age also plays a factor, as bundle branch block becomes more common as people age.
Medications can also contribute to electrical heart disorders. For instance, certain drugs like Digitalis, Beta-blockers, and Calcium channel blockers can slow down electrical conduction within the heart, leading to first-degree heart block. On the other hand, emotional and physical stress can cause even healthy hearts to experience irregular rhythms or palpitations.
Arrhythmias can be further classified into tachycardia (fast heart rate) and bradycardia (slow heart rate). Ventricular tachycardia, originating in the ventricles, can be life-threatening, leading to fast and inefficient heartbeats. In contrast, bradycardia, caused by a slowdown in the AV node, results in a dangerously slow pulse.
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Frequently asked questions
Some common electrical disorders of the heart include Long QT Syndrome (LQTS), heart block, bundle branch block, and Brugada syndrome.
Symptoms of an electrical heart disorder may include an irregular heartbeat, tachycardia (a fast heartbeat), bradycardia (a slow heartbeat), and in some cases, the heart may stop beating.
Electrical heart disorders can be caused by a range of factors, including genetics, heart disease, high blood pressure, diabetes, medications, and lifestyle factors such as excessive alcohol or caffeine consumption.
