![]() ![]() It can remain undetected for long periods of time. It may not cause any symptoms, or the symptoms may only occur some of the time. Atrial fibrillation: This is the most common type of tachycardia, where the heart beats in a rapid, irregular way.The irregular heartbeat conditions that are classed as tachycardia include the following: This can often happen if the heart is damaged from a previous heart attack. The rapid heart rate does not allow the ventricles to properly fill with blood, and as a result, the heart cannot pump enough blood to the body. Ventricular tachycardia: This type occurs when there are faulty electrical signals within the ventricles, and it can be very dangerous.It can cause bursts of a rapid but rhythmically regular heartbeat that can last for a few seconds to a few hours. Supraventricular tachycardia: This type covers irregular heartbeats that start in the atria or AV node, above the lower chambers of the heart (ventricles).The two main types of tachycardia are the following. Tachycardia is a fast heartbeat, where the resting heart rate is greater than 100 beats per minute. A normal resting heart rate is regular, with a rate usually between 60 to 100 beats per minute. In general, the types of irregular heartbeat can be grouped by the speed of the heart rate. Physical activity, stress, or even caffeine and nicotine can cause an increase in premature beats. While some heart diseases can cause these beats, most of the time they are harmless. Everyone experiences these extra beats occasionally, but most people do not notice them. ![]() These are extra beats that occur singly or can occur in patterns alternating with the normal heartbeat. Heart arrhythmias differ from a murmur in that they are caused by an interruption in the electrical signals that control the rhythm at which the heart beats.The most common type of irregular heartbeat is premature heartbeats. Other murmurs, however, may be caused by an abnormality in one or more of the heart valves and/or another heart problem. Murmurs are often deemed “innocent,” a term used to indicate they are harmless. The extra sound occurs when something disturbs the passage of blood through the heart, making the blood flow more turbulent than normal. Shortly after, the other two valves close, making the “dub” sound.Ī heart murmur is an extra “whooshing” sound that comes from the heart. When two of the valves close, they make a “lub” sound. These valves open to allow blood to pass through and close to stop blood from flowing backwards. The sounds come from four valves that regulate blood flow through the chambers and out of the heart to the lungs and rest of the body. Also, certain medications, stress, strong emotions, and vigorous physical activity can cause heart palpitations.Īs the heart beats and blood flows through its four chambers, it makes a “lub-dub” sound. Sometimes, they are a sign of other medical conditions unrelated to the heart, including an overactive thyroid, anemia, low blood pressure, dehydration, hormonal changes, or low potassium levels. However, heart palpitations are very common. More serious arrhythmias can be due to underlying heart disease, such as blockages in the arteries or heart attack, heart failure, or congenital heart defects. Occasionally other medical problems, such as hyperthyroidism, can bring on or worsen some types of arrhythmia.īenign extra beats can be exacerbated by smoking, alcohol, caffeine, or stress. While some arrhythmias are due to problems purely of the heart’s electrical system, others can be caused by underlying heart problems, or made worse by poor health habits. This can happen because of problems with heart muscle cells or blockages in the heart’s electrical system, or when extra circuits or spots in the heart give off extra beats. Our heartbeats are controlled by electrical signals, and arrhythmia can happen if those electrical signals are delayed or blocked.
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