Heart failure
The chances of a person to suffer from heart failure increases when the person is already going through some heart diseases or problems like atrial fibrillation. As the heart is not beating at the normal pace due to the irregular heartbeats, thus making it easy for the heart muscles to collapse much faster. As the chambers of the heart do not completely get the necessary blood supply, so they are eventually not able to pump enough blood to the body tissues and the lungs. In addition to that, if a person is suffering from heart failure, then atrial fibrillation worsens the symptoms of heart failure in the patient making the heart much weaker.