Does anyone know about sinus tachycardia?

does anyone know about sinus tachycardia???

Here is some information from the Mayo Clinic, I hope it helps:

Tachycardia is caused by something that disrupts the normal electrical impulses that control the rhythm of your heart's pumping action. Many things can cause or contribute to problems with the heart's electrical system. These factors include:
Damage to heart tissues from heart disease
Abnormal electrical pathways in the heart present at birth (congenital)
Disease or congenital abnormality of the heart
High blood pressure
Drinking too much alcohol
Drinking too many caffeinated beverages
A side effect of medications
Abuse of recreational drugs, such as cocaine
Imbalance of electrolytes, mineral-related substances necessary for conducting electrical impulses
Overactive thyroid (hyperthyroidism)

In some cases, the exact cause of tachycardia can't be determined.

Electrical circuitry of the heart
Your heart is made up of four chambers — two upper chambers (atria) and two lower chambers (ventricles). The rhythm of your heart is normally controlled by a natural pacemaker — the sinus node — located in the right atrium. The sinus node produces electrical impulses that normally start each heartbeat.

From the sinus node, electrical impulses travel across the atria, causing the atria muscles to contract and pump blood into the ventricles. The electrical impulses then arrive at a cluster of cells called the atrioventricular node (AV node) — usually the only pathway for signals to travel from the atria to the ventricles.

The AV node slows down the electrical signal before sending it to the ventricles. This slight delay allows the ventricles to fill with blood. When electrical impulses reach the muscles of the ventricles, they contract, causing them to pump blood either to the lungs or to the rest of the body.

There are several treatments you doctor might recommend, from certain physical steps to employ when your heart rate speeds, to medication, to more invasive physical procedures.

The important thing to remember is that while this is scary, it is treatable.