Is syncope caused by cardiac arrhythmias?
Although certain irregular heart rates (arrhythmias) may cause syncope, fainting isn’t inevitable if you have an arrhythmia. Your likelihood of fainting will increase if you have anemia, valvular heart disease or coronary artery disease. Your chances of fainting also go up if you have cerebrovascular disease which is damage to the vessels which supply blood and oxygen to the brain. Some of the arrhythmias which may cause fainting are: atrioventricular block, sinus node disorder, ventricular tachycardia, paroxysmal atrial tachycardia, atrial fibrillation, or bradycardia.
