Hi doctor, My wife is 34 weeks pregnant. She has known tachycardia and had an unsuccessful ablation at 11 years old. Around six weeks ago, using pulse oximeter I have at home, I noticed her resting heart rate had dramatically increased. It went from an average of around 100 to around 130 and 140, sometimes 123. She has just had a 48-hour tape fitted today, and amazingly her heart rate has now dropped to an average of 95. She has not been stressed about her heart, so it cannot be that reason why all of a sudden it has dropped. What could be the cause of this?
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