Molly Ayala
The electrical system of the heart, also known as the cardiac conduction system, is a network of nodes, cells, and signals that controls the heartbeat. Electrical signals move through the heart, causing it to beat and pump blood. When there is a problem with these electrical signals, it can lead to an irregular heartbeat, known as an arrhythmia. Arrhythmias 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. Treatment for arrhythmias aims to restore a normal heart rhythm, manage symptoms, and improve overall heart health.
| Characteristics | Values |
|---|---|
| Cause | Something going wrong with the impulses needed to keep the heart beating |
| Symptoms | The heart beating too fast (tachycardia) or too slow (bradycardia), an irregular heartbeat, fatigue, feeling unable to do regular activities |
| Diagnosis | ECG, electrophysiology study, heart monitor |
| Treatment | Lifestyle changes, medication, cardiac procedures, surgery, pacemaker placement |
| Risk Factors | Genetics, heart disease, high blood pressure, diabetes, medications, lifestyle factors (e.g. excessive alcohol or caffeine consumption) |
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What You'll Learn
Heart block
There are three degrees of heart block, categorized based on the severity of the disruption to the electrical signals. First-degree heart block is the least severe, where the electrical signals slow down as they move between the heart chambers. Individuals with this type of heart block may not require any treatment. Second-degree heart block is more severe, with intermittent failure of electrical conduction between the atria and ventricles, causing "dropped beats." This type of heart block often requires medical intervention.
Third-degree heart block, also known as complete heart block, is the most severe form. In this case, electrical signals cannot pass from the upper chambers to the lower chambers at all. While the lower chambers continue to pump blood, it is at a slower rate, and blood flow to the body may be impaired. People with third-degree heart block require immediate medical attention as they are at a heightened risk of cardiac arrest. Treatment options for severe heart block may include a temporary or permanent pacemaker to regulate the heartbeat.
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Bundle branch block
If there is a block in one of these branches, the electrical impulse must take a different route to reach the ventricle. This detour slows down the electrical impulse, causing one ventricle to contract a fraction of a second slower than the other. This results in an irregular heartbeat, which is one of the first signs of an electrical heart disorder. However, most people with BBB do not experience symptoms, and treatment is often not required. In some cases, BBB may cause fainting (syncope) or a feeling of faintness (presyncope). If both bundles are blocked, the heart may beat very slowly, requiring a pacemaker.
BBB can be caused by damage to one or both of the branch bundles, for example, due to a heart attack. It is also associated with underlying health problems such as heart disease, high blood pressure, and pulmonary hypertension. It is more common in older adults than in younger people. BBB can be diagnosed using an electrocardiogram (EKG or ECG), which records the electrical impulses of the heart and can show the location of the block.
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Long QT syndrome
The term "long QT" refers to a problem with the pattern seen on an electrocardiogram (EKG or ECG). An EKG is a test that detects and records the heart's electrical activity, which is mapped as five separate electrical waves: P, Q, R, S, and T. The QT interval represents the electrical activity that occurs between the Q and T waves, showing the electrical activity in the ventricles. In people with LQTS, this interval is longer than normal, upsetting the careful timing of the heartbeat and resulting in sudden, uncontrollable fast heart rhythms.
LQTS can be inherited, meaning an individual is born with the condition, or it can be acquired during one's lifetime. It is often the result of conditions, medications, or events that prolong the QT interval. For example, a combination of a genetic mutation and medication that prolongs the QT interval can trigger symptoms. While LQTS is uncommon, it is more prevalent in women than men, and the risk of abnormal heart rhythm tends to decrease with age, especially in men over 40.
Diagnosis of LQTS involves a review of medical history, family medical history, symptoms, and medications. Physical examinations and additional tests, such as blood tests, genetic testing, and heart tests like EKGs, may also be employed. While there is no cure for LQTS, treatment aims to prevent arrhythmias and fainting spells by managing symptoms and reducing the risk of complications.
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Genetics
A range of factors can cause electrical changes in the heart, and genetics is one of them. Many cardiac disorders, including arrhythmias, can be inherited. Inherited heart conditions are caused by a change in one or more genes, which can be passed from parents to children in DNA. This is known as a "faulty gene" or a "mutation".
For example, a genetic variation can change the way a particular protein works, causing the body to process cholesterol differently and increasing the likelihood of blocked arteries. Hypertrophic cardiomyopathy, the most common form of inherited heart condition, is caused by a thickened heart muscle that makes it harder for the heart to pump blood. Arrhythmogenic right ventricular cardiomyopathy (ARVC) is another inherited condition that can cause deadly arrhythmias.
Recent research in molecular genetics has established a link between several inherited, lethal cardiac arrhythmias and mutations in genes encoding for ion channels or other membrane components. For instance, a mutation in the CACNA1C gene is responsible for a defect in the L-type calcium current (ICa-L) underlying the rare LQT8 form, an arrhythmic disorder associated with dysfunction in multiple organs. Long QT Syndrome (LQTS), an inherited arrhythmia disorder, occurs when the lower heart chambers take too long to contract and pump blood out, resulting in an abnormal heart rhythm.
Genetic testing and counselling are available for individuals with a family history of heart disease or early heart attacks. These services can confirm the diagnosis of an inherited heart condition and provide support to affected individuals and their families.
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Heart disease
One of the most common electrical heart disorders is Long QT Syndrome (LQTS), which occurs when the lower heart chambers take too long to contract and pump blood out. This can cause abnormal heart rhythms in response to exercise, stress, or emotional outbursts. Another disorder is heart block, which occurs when the electrical impulses between the heart's upper and lower chambers are slowed or impaired, resulting in an irregular heartbeat. In the case of third-degree heart block, electrical signals cannot pass from the upper to the lower chambers at all, requiring immediate medical attention as it can lead to cardiac arrest.
Bundle branch block is another type of heart conduction disorder where a "block" in one of the branches causes electrical signals to take a detour, resulting in one ventricle contracting a fraction of a second slower than the other. While many people with bundle branch block do not experience symptoms and may not require treatment, it is important to have regular check-ups to monitor the condition.
Arrhythmias are electrical problems in the heart that can cause disturbances in the rhythm of the heartbeat, such as tachycardia (a fast heartbeat) or bradycardia (a slow heartbeat). These disorders can be caused by problems with the heart's electrical system, resulting in abnormal electrical impulses that can lead to a sudden stop in the heart's function. Atrial fibrillation is a common type of arrhythmia characterised by abnormal electrical impulses in the top chambers of the heart, often making people feel like their heart is "skipping" or beating erratically.
Treatment for heart electrical problems caused by heart disease varies depending on the specific type and severity of the disorder. Common options include drugs that control heart rate, lifestyle changes, cardiac procedures, or surgery. It is crucial for individuals with these conditions to work closely with their healthcare team to determine the most appropriate treatment approach and make necessary adjustments to support heart health.
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Frequently asked questions
The cardiac conduction system is your heart’s electrical system. Its signals tell your heart when to beat.
The symptoms of electrical heart problems include an irregular heartbeat, fatigue, and the feeling of the heart "skipping" or beating erratically.
Electrical heart problems can be caused by a range of factors, including genetics, heart disease, high blood pressure, diabetes, medications, and lifestyle factors like excessive alcohol or caffeine consumption.
Treatment for electrical heart problems can include lifestyle changes, medications, cardiac procedures, or surgery.
