Sit or lie down. Take some slow, deep breaths. Follow your doctor's instructions, which often means taking an extra dose of your heart-slowing medication. If you develop chest pain or shortness of breath, call for emergent advice or have someone drive you to an emergency department now.
If you have no other symptoms, you may still want to contact your doctor to discuss adjusting your regular medications. This is most important if you notice the palpitations and rapid heart rate frequently.
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