Wiktor Wise
Electrical disturbances in the heart, also known as cardiac arrhythmias or heart rhythm disorders, refer to irregularities in the electrical impulses that coordinate the contraction of the heart muscle. These electrical signals are essential for maintaining a regular and synchronised heartbeat. When there are disruptions in this electrical system, various heart rhythm disorders can occur, leading to abnormal heartbeats (arrhythmias). Heart electrical problems can be caused by a range of factors, including genetics, heart disease, high blood pressure, diabetes, medications, and even lifestyle factors like excessive alcohol or caffeine consumption. These disturbances can be harmless or serious, and treatment options vary depending on the type and severity of the arrhythmia.
| Characteristics | Values |
|---|---|
| Controlled by | Involuntary electrical impulses |
| Conduction disorder | Electrical signals that don't transmit properly |
| Conduction disorder types | Heart block, bundle branch block, long QT syndrome |
| Heart block types | First-degree, second-degree, third-degree |
| Heart block symptoms | Irregular heartbeat, slow heart rate, fainting, chest pain |
| Bundle branch block | Electrical signals travel more slowly on one side of the heart |
| Treatment | Lifestyle changes, medication, cardiac procedures, surgery |
| Risk factors | Genetics, heart disease, high blood pressure, diabetes, medications, lifestyle factors |
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Atrial fibrillation
During atrial fibrillation, the heart quivers and beats irregularly, sometimes resulting in a sensation of the heart beating too fast, skipping beats, or exercise intolerance. Other symptoms include fatigue, shortness of breath, swelling, and loss of consciousness due to a lack of oxygen and blood supply to the brain. AFib can also lead to blood clots, stroke, and heart failure.
AFib is often identified through a physical examination or an electrocardiogram (ECG), which shows irregularly spaced QRS complexes without P waves. It is a common condition, affecting approximately 33 million people worldwide as of 2020, with an increasing prevalence in the ageing population.
Risk factors for atrial fibrillation include high blood pressure, valvular heart disease, heart failure, coronary artery disease, cardiomyopathy, congenital heart disease, lung diseases (such as COPD), obesity, sleep apnea, stress, excess alcohol intake, tobacco smoking, diabetes, and thyroid problems.
Treatment options for AFib include medications to control heart rhythm or rate, surgery, or managing underlying health conditions. Healthy lifestyle changes, such as weight loss, increased physical activity, and reduced alcohol consumption, can also help lower the risk and burden of AFib.
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Atrial flutter
A normal heartbeat begins with an electrical impulse from the sinus node, a small area in the heart's right atrium (right upper chamber). During atrial flutter, the short circuit creates a circular electrical pathway that allows the impulse to move quickly around the right atrium. The rate of heartbeat is based on the ratio of atrial beats to ventricular beats.
The cause of atrial flutter may be unknown, but it is often the result of damage to the heart's electrical system. This damage may be caused by other conditions. Atrial flutter may cause no symptoms at all, but it can lead to blood pooling in the upper chambers, increasing the risk of clot formation and causing a stroke that may result in permanent disability or death.
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Heart block
There are several degrees of heart block, including first-,second- and third-degree heart block. First-degree heart block is the least severe form and rarely causes symptoms. It occurs when the electrical impulse moves through the heart's AV node slower than normal, resulting in a slower heart rate. It might not require treatment of any kind. Second-degree heart block is when the heart's electrical signals don't reach the bottom chambers, causing "dropped beats". There are two types of second-degree heart block: Mobitz type I, where the electrical signals get slower and slower between beats, and Mobitz type II, where the electrical signals sometimes get to the ventricles and sometimes don't. Second-degree heart block may require medical intervention. 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 on to the lower chambers at all, resulting in a very slow pulse or no pulse at all. People with third-degree heart block require immediate medical attention and may need a temporary or permanent pacemaker.
The main test used to diagnose heart block is an electrocardiogram (ECG), which measures the electrical activity of the heart. Other tests that may be used include echocardiograms, MRI scans, exercise tests, Holter monitors, event monitors, implantable loop recorders, and electrophysiology studies. Treatment for heart block depends on the underlying cause and the presence and severity of symptoms. In some cases, changing medications or treating the underlying condition may be sufficient, while in other cases, a pacemaker may be necessary.
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Long QT syndrome
LQTS is a rare disorder that can cause abnormal heart rhythms, particularly in response to exercise or stress. While not everyone with LQTS experiences dangerous heart rhythms, those who do can face fatal consequences. The condition can be inherited, acquired, or both. Inherited LQTS is a lifelong condition, while acquired LQTS is developed during one's lifetime and may be caused by conditions, medications, or events that prolong the QT interval. Certain medications, such as those for high blood pressure and depression, can increase the risk of conduction disorders like LQTS. Additionally, grapefruit juice may increase the risk of a dangerous cardiac event when combined with triggering drugs.
The ion channels on the surface of each heart muscle cell play a crucial role in generating the heart's electrical activity. In LQTS, these ion channels may not function properly or may be insufficient in number, disrupting the electrical activity in the heart's lower chambers, known as the
Diagnosing LQTS involves a comprehensive approach, including taking the patient's medical history, family history, symptoms, and medications into account. Physical exams, blood tests, genetic testing, and heart tests such as EKGs or stress tests may also be employed. Treatment focuses on preventing arrhythmias and fainting spells, but it does not cure the disorder or necessarily restore a normal QT interval. It is important for individuals with LQTS to consult their physicians about safe physical activity levels and medications to avoid.
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Bundle branch block
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. 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 heart's electrical activity begins in the sinoatrial node (SA node), which is situated in the upper right atrium and acts as the heart's natural pacemaker. The impulse then travels through the left and right atria and summates at the atrioventricular node (AV node). From the AV node, the electrical impulse travels down the bundle of His and divides into the right and left bundle branches, leading to the heart's lower chambers or ventricles.
If one or both of these bundle branches are damaged—for example, due to a heart attack—the electrical impulses can become blocked. As a result, the heart beats irregularly. The cause of bundle branch blocks can differ depending on whether the left or right bundle branch is affected. Sometimes, there is no known cause. Bundle branch blocks can be congenital, i.e., present at birth, or acquired later in life. They are more common in older adults due to normal changes in the conduction system with age.
When there is a block in one of the bundle branches, the electrical impulse must travel to the ventricle by a different route. While the rate and rhythm of the heartbeat are typically unaffected, the impulse is slowed, causing one ventricle to contract a fraction of a second slower than the other. The block can be classified as a right bundle branch block (RBBB) or a left bundle branch block (LBBB), depending on which branch is affected. If both bundles are blocked, the heart may beat very slowly, requiring a pacemaker.
In most cases, bundle branch block does not cause symptoms or require treatment. Some people with the condition are unaware they have it. Rarely, symptoms may include fainting (syncope) or feeling faint (presyncope). Bundle branch block may also be a warning sign of other, more serious heart conditions, such as heart disease. Doctors can use an electrocardiogram (EKG or ECG) to detect and diagnose bundle branch block by analysing the electrical impulses of the heart.
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Frequently asked questions
Electrical disturbances in the heart, also known as cardiac arrhythmias or heart rhythm disorders, are irregularities in the electrical impulses that coordinate the contraction of the heart muscle. These electrical signals are essential for maintaining a regular and synchronised heartbeat.
Electrical disturbances in the heart can be caused by a range of factors, including genetics, heart disease, high blood pressure, diabetes, medications, and even lifestyle factors like excessive alcohol or caffeine consumption.
Treatment options for electrical disturbances in the heart vary depending on the type and severity of the condition. They may include lifestyle changes, medications, cardiac procedures, or surgery. Lifestyle changes can include reducing the intake of stimulants like caffeine and alcohol, adopting a heart-healthy diet, and regular, moderate-intensity exercise.
