If the SA node of the heart isn't functioning properly, then this might lead to abnormal rhythms and irregular heartbeat. It is then that you might need a pacemaker. Sometimes the SA node is not able ...

In order for the heart to do its work of pumping oxygen-rich blood to the body, it needs a trigger or electrical impulse to generate a heartbeat. This electrical impulse originates from the sinus node ...

The heart rate is the number of times the heart beats per unit of time. There are several abnormalities of this rate and rhythm. This is a term that describes different conditions in which the heart ...

A first-degree AV node block occurs when conduction through the AV node is slowed, thus delaying the time it takes for the action potential to travel from the SA node, through the AV node, and to the ...