Often there is not one single cause of heart failure. There are a number of conditions that make it more likely that you will develop heart failure. These include:
Coronary heart disease, when the arteries supplying blood to the heart become furred up and narrow due to atherosclerosis. This is the most common cause of both heart attack and heart failure.
High blood pressure puts extra strain on the heart and over time can lead to heart failure.
Damage to the heart muscle (cardiomyopathy) can lead to heart failure. Damage can be caused by infections but also by alcohol misuse, drug abuse or sometimes as a side effect of prescribed drugs. Heart attacks can also damage the heart muscle.
Heart rhythm disturbance (atrial fibrillation).
Heart valve disease, damage or problems with the valves in the heart due to infection, atherosclerosis or ageing can lead to heart failure.
Anaemia.
An overactive thyroid gland.
Many of these factors can be managed either by making lifestyle changes or by taking medicines.
Risk factors you can't change
There are other conditions that you can’t change that can also increase the risk of developing heart failure. These include those mentioned below.
Heart rhythm abnormalities (arrhythmias)
If the heart beats too fast, it may not have enough time to fill and empty properly, which causes the heart muscle to weaken. A slow heartbeat may reduce the heart output and cause symptoms of heart failure.
An irregular heart rhythm increases the risk of a blood clot (thrombosis), causing a heart attack or stroke. In some patients it may cause heart failure, especially if the heart rate is too fast.
Myocarditis
This is inflammation of the heart muscle and most commonly caused by infection with a virus. This inflammation can lead to heart failure.
Damaged heart valves
The heart contains four valves that make sure the blood flows one way through the heart. A leaking valve means the heart has to work harder and stretches to deal with the extra volume of blood. A narrowed valve can obstruct blood flow and reduce the amount of blood the heart can pump. Over time both a leaking valve or a narrowed valve can weaken the heart muscle.
Heart valves can be damaged during a heart attack, and some children are born with faulty valves (congenital heart disease). Valves can be repaired with a surgical operation if the damage is detected in time.
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