It is important to point out that there are many different types of rhythm problems that can cause palpitations. The majority are not dangerous but there are some that can be life-threatening. It is difficult to tell what kind of rhythm problem someone has based only on the way the palpitations feel. Capturing the palpitations on an electrocardiogram (ECG) is a critical step that enables your physician to tell if the palpitations are something safe or something that needs further investigation. An ECG can be done in the office if the palpitations are occurring in the office. Another way is by using a portable ECG recorder that you can carry around with you for as long as it takes to capture the palpitations.