The causes ad effects of abnormal cardiac rhythms in the human body
Ventricular fibrillation Ventricular fibrillation VF can stop the heart from beating and cause cardiac arrest. Stroke Strokes brain attacksalthough not true heart disorders, are caused by blockage or reduced blood flow to the brain.
If you're physically fit, you may have an efficient heart capable of pumping an adequate supply of blood with fewer than 60 beats a minute at rest. A few beats of ventricular tachycardia often do not cause problems. This can happen when the nerve cells that produce electrical signals do not work properly or when the electrical signals do not travel normally through the heart. Abnormal heart rhythms arrhythmias are sequences of heartbeats that are irregular, too fast, too slow, or conducted via an abnormal electrical pathway through the heart. The term "arrhythmia" refers to any change from the normal sequence of electrical impulses, causing abnormal heart rhythms. Explore this Health Topic to learn more about arrhythmia, our role in research and clinical trials to improve health, and where to find more information. Treatment of SSS usually involves implanting a pacemaker, often along with medication. Sometimes the upper and lower chambers beat at different rates.
The normal conduction pathway is interrupted. Arrhythmia is caused by changes in heart tissue and activity or in the electrical signals that control your heartbeat.
Prevention strategies - Arrhythmia Learn about prevention strategies that your doctor may recommend, including: Avoiding triggers, such as caffeine or stimulant medicines, that can cause arrhythmias or make them worse.
Your risk of developing coronary artery disease and high blood pressure greatly increases with uncontrolled diabetes.
A few beats of ventricular tachycardia often do not cause problems. Ventricular fibrillation An irregular heart rhythm consisting of very rapid, uncoordinated fluttering contractions of the ventricles.
However, women taking certain medicines appear to be at a higher risk of a certain type of arrhythmia.
Low blood sugar Lung diseases, such as chronic obstructive pulmonary disease COPD Musculoskeletal disorders Overactive or underactive thyroid gland, caused by too much or too little thyroid hormone in the body. The sinus node produces electrical impulses that normally start each heartbeat. Supraventricular tachycardia is a broad term that includes many forms of arrhythmia originating above the ventricles supraventricular in the atria or AV node. From the sinus node, electrical impulses travel across the atria, causing the atria muscles to contract and pump blood into the ventricles. It pumps blood continuously through the circulatory system. If arrhythmia is left untreated, the heart may not be able to pump enough blood to the body. Atrial fibrillation may be temporary, but some episodes won't end unless treated. ICD implantable cardioverter-defibrillator - the device is implanted near the left collarbone and monitors heart rhythm; if it detects an abnormally fast rhythm, it stimulates the heart to return to a normal rhythm. Ventricular tachycardia can often be a medical emergency. Some medical conditions, such as congenital heart defects, may also cause long QT syndrome.
From the AV node, electrical impulses travel down a group of specialized fibers called the His-Purkinje system to all parts of the ventricles. Sex - Arrhythmia Some studies suggest that men are more likely to have atrial fibrillation than women. The premature, or extra, heartbeat creates a short pause, which is followed by a stronger beat when your heart returns to its regular rhythm.
Irregular heartbeat causes
Risk Factors - Arrhythmia You may have an increased risk of arrhythmia because of your age, environment, family history and genetics , habits in your daily life, certain medical conditions, race or ethnicity, sex, or surgery. AFib causes the heart rate to increase and become erratic. The rate at which the pacemaker discharges the electrical current determines the heart rate. If you have heart disease, physical activity can trigger arrhythmia due to an excess of hormones such as adrenaline. Family history and genetics - Arrhythmia You may have an increased risk of some types of arrhythmia if your parent or other close relative has had arrhythmia, too. Atrial flutter can cause the upper chambers to beat to times per minute. An excess of thyroid hormone can cause the heart to beat faster, and thyroid deficiency can slow your heart rate. Torsades de pointes is a type of arrhythmia that causes a unique pattern on an EKG and often leads to v-fib. A block can also occur along other pathways to each ventricle. Look for - Arrhythmia Treatment will discuss heart-healthy lifestyle changes that your doctors may recommend if you are diagnosed with arrhythmia. Atrial flutter is similar to atrial fibrillation. As with atrial fibrillation, some but not all of these signals travel to the lower chambers. Ventricular fibrillation Ventricular fibrillation VF can stop the heart from beating and cause cardiac arrest. But if arrhythmias last longer, they may cause the heart rate to be too slow or too fast or the heart rhythm to be erratic — so the heart pumps less effectively.
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