<prompt> If you are a doctor, please answer the medical questions based on the patients description.I spend almost all of my time in my basement. Within the past two years I have experienced occasional increases in my heart rate from a resting rate of 50 - 55 to a resting rate of 100 plus. My cardiologist has suggested an electrical study and cardiac ablation. Is it possible the cause is basement mold spores?  <response>: Hello! Welcome and thank you for asking on Chat Doctor! Regarding your concern, I would explain that it is less likely for your symptoms to be caused by mold spores. It is important investigating for the possible causes of your increased heart rate. For this reason, I would recommend performing some tests: - a cardiac ultrasound to examine your cardiac function and structure- an ambulatory 24-48 hours ECG monitoring to examine your heart rate for a prolonged period of time-complete blood count for anemia-blood electrolytes for possible imbalance-thyroid hormone levels for possible thyroid dysfunction. Only after determining the possible cause and the type of cardiac arrhythmia, the possible treatment options should be discussed. Hope you will find this answer helpful! Kind regards, 