You don’t need an echo to check your heart rate. an echo is used to visualize the heart’s anatomy and to check some hemodynamic parameters. A murmur can due to certain structural defects that can be visualized by echo-cardiography. Sometimes a heart murmur can be functional and due to no structural damage of the heart.
Normal heart rate when at rest is in the range of 60-80 beats per minute. It normally rises when physically active. It is likely you probably have a type of tachycardia but only an ECG-examination can tell us what kind of tachycardia. Tachycardia can be due to many reasons: heart disorders, anemia, hypothyroidism, dehydration, stress, drugs, fiver…
You may want to request an ECG from your GP.
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