Im a 40 year old male that experiences a heightened heart beat and dizziness from time to time.  I realized that when Im having this episode that if I take a few deep breaths that my heart beat with go back to normal and the dizziness goes away.  What can this be?
Hi, Thanks for your question. After going through your question, there is likely possibility of Supra ventricular tachycardia a type of cardiac arrhythmia. Cardiac arrhythmia is due to abnormality in conduction system of heart. You should consult cardiologist. Following investigation may help you - 1) ECG during episode of palpitations and dizziness will give better idea that ECG at rest. 2) Holders Monitoring and Electrophysiologist study of heart. 3) 2DEcho of heart. 4) Blood test like Kidney and Liver function test, Thyroid function test, serum calcium, magnesium.  Hope this helps you, if so do vote helpful.