Otis Singleton
The heart's electrical system is a complex mechanism that sends signals from one section of the heart to another, allowing it to pump blood to the body. Electrical issues in the heart, also known as conduction disorders or arrhythmias, occur when these electrical signals are disrupted or do not travel through the heart as they should. This can cause the heart to beat too fast (tachycardia) or too slow (bradycardia), resulting in an irregular heartbeat. Conduction disorders can be caused by a variety of factors, including congenital defects, age, underlying health conditions such as high blood pressure or heart disease, and certain medications. Some conduction disorders, such as Brugada syndrome, are also more common in specific populations, such as people of Asian descent.
| Characteristics | Values |
|---|---|
| General term | Electrical heart disorder or heart rhythm disorder |
| Cause | Something goes wrong with the impulses needed to keep the heart beating |
| Symptoms | Heart chambers pump in the wrong order, impulses sent too quickly or too slowly, irregular heartbeat |
| Types | Tachycardia (heart beating too fast), bradycardia (heart beating too slow), arrhythmia, atrial fibrillation, atrial flutter, sick sinus syndrome, sinus tachycardia, ventricular tachycardia, fibrillation, heart block, long QT syndrome, bundle branch block, Brugada syndrome, catecholaminergic polymorphic ventricular tachycardia |
| Risk factors | Age, genetics, connective tissue disorder, high blood pressure, heart disease, pulmonary hypertension, congenital heart defects, medications (e.g. digitalis, beta blockers, calcium channel blockers) |
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Conduction disorders
There are many types of conduction disorders that can occur anywhere along the cardiac conduction system, which includes the SA node, the AV node, and the bundle branches. Sick sinus syndrome (SSS), also known as sinus node disease, is a conduction disorder where the SA node, which controls the rate and rhythm of the heartbeat, malfunctions. SSS can cause a slow or fast heart rate and can also cause problems with increasing the heart rate when needed, such as during exercise.
Atrioventricular (AV) block, or heart block, is a conduction disorder where the electrical impulses that pass between the heart's upper and lower chambers are slowed or impaired. There are three degrees of AV block, depending on the severity of the condition. First-degree heart block occurs when electrical impulses move between the heart chambers at a slower rate than normal. Second-degree heart block happens when only some electrical signals from the heart's upper chambers reach the lower chambers, causing the heart to miss beats and beat slowly and irregularly. Third-degree heart block, or complete heart block, occurs when no signals reach the ventricles, the lower chambers of the heart. This can cause serious symptoms such as a very slow heart rate, fainting, and chest pain.
Bundle branch blocks are conduction disorders where the electrical signals travel more slowly in one side of the heart than the other. This causes one ventricle to contract a fraction of a second slower than the other, resulting in an abnormal heartbeat. Most people with bundle branch block do not experience symptoms, and treatment is often not necessary.
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Arrhythmias
An arrhythmia is a disturbance or irregularity in the rhythm of the heartbeat. It can cause the heart to beat too quickly, too slowly, or with an irregular rhythm. It is also described as a "skipping" or "racing" heartbeat.
There are several types of arrhythmias, including:
- Atrial fibrillation: ineffective contractions of the atria caused by abnormal electrical impulses in the top chambers of the heart, leading to a “skipping" heartbeat.
- Atrial flutter: a rapid heartbeat involving the atria, caused by a "short circuit" in the upper half of the heart.
- Sick sinus syndrome: a problem with the sinus node, which is responsible for the heart's electrical signals.
- Long QT syndrome: the lower heart chambers take too long to contract and pump blood out, often triggered by intense emotions or physical activity.
- Heart block: a condition where the electrical impulses between the heart's upper and lower chambers are impaired, causing the heart to beat irregularly.
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Heart block
The condition can be categorised into different degrees depending on the severity and location of the blockage. First-degree heart block occurs when electrical impulses move between the heart chambers at a slower rate than normal, and it may not cause any noticeable symptoms. Second-degree heart block happens when the heart's electrical signals don't reach the bottom chambers, resulting in "dropped beats" and possibly requiring a pacemaker. The most severe form is third-degree heart block, where electrical impulses from the upper chambers cannot pass to the lower chambers at all. This can be life-threatening and usually requires a pacemaker.
Symptoms of heart block can vary, ranging from none at all to severe symptoms such as dizziness, fainting, shortness of breath, fatigue, and cardiac arrest. The treatment depends on the type of heart block and the presence and severity of symptoms. In some cases, no treatment is needed, while others may require a pacemaker or other medical interventions to manage the condition and prevent complications.
While the exact cause of heart block may not always be identified, understanding the electrical system of the heart is crucial. The electrical impulses travel along a specific pathway, including the right and left bundles, to ensure the heart contracts and pumps blood effectively. Any disruption to this pathway can lead to heart block and other electrical disorders of the heart, emphasising the delicate balance required for proper heart function.
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Bundle branch block
The human heart is a complex organ with its own electrical system. Electrical impulses within the heart muscle cause it to beat or contract. These impulses travel along a pathway, including two branches called the right and left bundles. The electrical impulses first travel through the heart's upper chambers (the atria) and then pass through the atrioventricular (AV) node. The AV node then sends the electrical impulse along a track called the bundle of His, which divides into the right and left bundle branches. These branches lead to the heart's lower chambers (the ventricles).
A bundle branch block is a partial or complete interruption in the flow of these electrical impulses in either of the bundle branches of the heart's electrical system. The delay or blockage can occur on the pathway that sends electrical impulses to either the left or the right side of the bottom chambers (ventricles) of the heart. This means that the electrical impulses have to take a different, longer route, which slows them down. If one bundle is damaged, the ventricles rely on the other bundle to receive and respond to signals from the right atrium. If both bundles are blocked, the heart may beat very slowly, which can require a pacemaker.
There are two types of bundle branch block: right bundle branch block and left bundle branch block. The block can be caused by coronary artery disease, cardiomyopathy, or valve disease. Bundle branch block is more common in older adults than in younger people. In most cases, BBB does not need treatment. However, bundle branch block can complicate the accurate diagnosis of other heart conditions, especially heart attacks. It may lead to delays in the proper management of those heart conditions.
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Brugada syndrome
The syndrome is more common in people of Asian descent, particularly those of Japanese, Thai, Filipino, and Southeast Asian heritage. It is also more frequently diagnosed in men than in women, with the disease occurring 8 to 10 times more often in men. Brugada syndrome has a high incidence of sudden death in patients with structurally normal hearts, and the mean age of sudden death is 41. The disease has been called Sudden Unexplained Nocturnal Death Syndrome, as people with it can often die in their sleep. Symptoms often start during adulthood, with the average age of diagnosis being around 40, but the disorder can develop at any age, including infancy.
A major sign of Brugada syndrome is an irregular result on an electrocardiogram (ECG), a test that measures the electrical activity of the heart. Genetic testing can also be done to help diagnose the condition. While there is currently no cure for Brugada syndrome, there are ways to protect people from its dangerous consequences. An implanted cardioverter defibrillator (ICD) can help prevent sudden death by attempting to stop the arrhythmia with pacing or delivering a shock to reset the heart back into its regular rhythm. Medicines may also help prevent arrhythmias, and in rare cases, a cardiac ablation procedure may be performed to destroy a small area of heart tissue found to cause the dangerous arrhythmia.
It is important to note that Brugada syndrome often does not cause any noticeable symptoms, and many people with the condition do not know they have it. However, some people with Brugada syndrome may experience fainting spells, and it is important to seek emergency medical attention if fainting is suspected to be due to a heart condition. Brugada syndrome can be triggered or irritated by a fever, so it is important for those with the condition to take preventive measures such as reducing fever and avoiding medications that might trigger the arrhythmia.
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Frequently asked questions
A heart's electrical system sends signals from one section of the heart to another, causing the heart to pump blood to the body.
Some common conduction disorders include bundle branch block, heart block, and Long QT Syndrome (LQTS).
Symptoms of a heart conduction disorder include an irregular heartbeat, the heart beating too fast (tachycardia), or beating too slow (bradycardia).
Electrical issues in the heart can be caused by conduction disorders, which can be inherited or developed later in life. They can also be caused by certain medications or underlying health problems such as high blood pressure or heart disease.
Treatments for electrical issues in the heart depend on the type of disorder and its severity. Some may require medical intervention such as a pacemaker, while others may be managed through lifestyle changes or medications.
