Sinus tachycardia is indicated on ECG with a normal upright P wave in lead II preceding every QRS complex (indicating that the pacemaker is coming from the sinus node and not elsewhere in the ...

This is thought to occur when cells surrounding the sinus node generate electrical impulses on their own. The condition, also ...

There are three primary types of tachycardia: Each form of tachycardia can cause different symptoms. Most people with sinus tachycardia have little to no symptoms, but some experience heart ...