Tachycardias, or extremely rapid heartbeats, can cause syncope. Examples include supraventricular tachycardia (SVT) and ventricular tachycardia.
Tachycardia and how it causes syncope
- The lower chambers (ventricles) are where ventricular tachycardia starts and it is extremely rapid.
- Ventricular tachycardia may not be problematic if it lasts only a few seconds.
- However, persistent ventricular tachycardia might drop blood pressure, which can cause syncope (fainting) or dizziness.
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