I'm wondering if it's normal to have tachycardia because both my ECG and echo tests came back normal, but I still experience it. My heart feels like it's beating really loudly, and when I check my pulse with an oximeter, it can shoot up to around 120, then it settles back to normal after a while. It's pretty scary when my heart rate spikes like that. Are there any more tests I should consider to figure out what's going on?

Tachycardia, or a fast heart rate, can be concerning even if your ECG and echo are normal. Since you are experiencing symptoms such as a loud heartbeat and fluctuations in your pulse rate, it is important to further investigate the underlying cause. To address your tachycardia and associated symptoms, you may consider undergoing additional tests such as a Holter monitor to continuously record your heart's activity over 24-48 hours, a stress test to evaluate your heart's function during physical activity, and blood tests to check for any underlying medical conditions. In the meantime, to help manage your tachycardia symptoms, you can consider taking medications such as Metoprolol (25-50mg) to help regulate your heart rate and reduce the sensation of palpitations. It is important to follow up with your healthcare provider for further evaluation and management.