Tachycardia above a ventricle (supraventricular).There are two main types: Tachycardia above a ventricle and Tachycardia in a ventricle.
Tachycardia occurs when your heart beats too fast.
The heart's electrical system normally sends signals from the upper chambers of the heart (atria) to the lower chambers (ventricles) in a pattern that causes a heartbeat, a coordinated contraction of the heart muscle. This is the slowing down or interruption of the electrical signal to the lower chambers of the heart which cause the heart muscle to contract. It can be treated with medication or with an electronic pacemaker. The resulting arrhythmia may be temporary or permanent. Some medications can also cause or aggravate a slow heartbeat. This condition may be caused by growing older or by disease. This is a malfunction in the heart's natural pacemaker (the sinus node), which makes it fire too slowly. An electronic pacemaker can help the heart to beat normally. Untreated bradycardia can cause excessive tiredness, dizziness, light-headedness or fainting. They include bradycardia and tachycardia, with a variety of conditions under those two categories.īradycardia occurs when your heart beats so slowly that it cannot pump enough blood for your body's needs. 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.Arrhythmias are defined by the speed of the heartbeats: slow and fast. 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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