Complications

Complications of tachycardia depend on the type of tachycardia, how fast the heart is beating, how long the rapid heart rate lasts and if you have any other heart conditions.

Possible complications include:

• Blood clots that can cause a stroke or heart attack
• Inability of the heart to pump enough blood (heart failure)
• Frequent fainting spells or unconsciousness
• Sudden death, usually only associated with ventricular tachycardia or ventricular fibrillation