heart and blood vessel disorders
Sinus Node Dysfunction
Symptoms of Sinus Node Dysfunction
Many types of sinus node dysfunction cause no symptoms. A persistent slow heart rate commonly causes weakness and tiredness. Fainting may occur if the rate becomes very slow. A fast heart rate is often perceived by the person as Palpitations . When the fast heart rate stops, fainting may occur if the sinus node is slow in restarting normal heart rhythm. 