sinus bradycardia

Sinus bradycardia is a condition where the heart's natural pacemaker, called the sinus node, sends out electrical signals more slowly than normal, resulting in a slower heartbeat—typically fewer than 60 beats per minute. This can be normal in well-trained athletes or during rest, but it might also indicate issues with the heart’s electrical system or other health conditions. Sometimes, it causes no symptoms, but if the heart doesn't pump enough blood, it can lead to fatigue, dizziness, or fainting. Diagnosis is through an electrocardiogram (ECG), and treatment depends on the underlying cause.