Question: Hello, I am a 32yo Woman, Normally fit and well, Non-smoker, occasionally drink alcohol, like to keep fit running and gym classes 3-4 times a week, BMI - 25
Over the past 3-4months I have been having episodes of symptomatic bradycardia with dizziness and light headedness and occasionally SOB and nausea, initially I was treated for low Iron levels but these symptoms have continued even though my iron levels are now normal. My resting heart rate is 55-60bpm but can drop to 40-45bpm even with minimal exertion. I have had ECGs showing sinus bradycardia at a rate of 41bpm (this was after a 10min walk to the GP surgery), I was symptomatic. On 2 occasions I have been woken with palpitations and found my HR to be 35bpm.
I had an echo that was normal and all blood results have come back normal too.
Yesterday while at work I had an episode of light headedness and dizziness, with a heavy feeling in my shoulders and both arms - I was checked in A&E - BP 126/79, HR 73, BM 5, Temp 36.6, 3 Lead ECG showed 1mm of depression in lead 2, but 12 lead ECG showed NSR with unknown T wave abnormality, Troponin level was 1. No nystagmus, no nausea, no vomiting, no headaches, I occasionally have difficulty focusing my eyes and sometimes find it difficult to take in information and concentrate. All of these symptoms are intermittent and I don't get them all at the same time.
I stopped taking Propranolol 40mg 2 months ago (started 10 yrs ago for tremors, not taken every day just when needed) and stopped taking Fluoxetine 20mg 8 days ago after reducing it gradually over about 6 weeks (was put on it in February this year for anxiety and depression after returning to work from maternity leave - now resolved).
My GP seems to be at a loss as to what is causing my symptoms and is unsure if it is cardiac related or maybe a vestibular disorder.
You thoughts would be greatly appreciated.
Many thanks

Thankyou for your reply. I am awaiting a 24hr ECG in a months time. Do you think my symptoms are more likely cardiac related rather than a vestibular disorder or neurological problem then?