Arrhythia and exercise

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Are we fortunate enough to have a cardiologist/sport specialist kicking around?

My NHS cardiologist is brilliant, but of course remarkably busy and with long wait times for appointments. She has given me the go-ahead to exercise after a 6 month break, but I'd ideally like a spot of guidance ref. heart rate, exertion level and so on.

The abbreviated version of events is 1 x black out in gym, blue lights to hospital and an overnighter (april). 2 mini episodes of uncontrolled heart rate (high) and light headedness. Another blue light run and overnighter following legs day, again uncontrolled high heart rate (sept).

No heart attack markers, ecg good, cat and mri scan show normal anatomy, normal function, good arteries. Doc reckons PSVT.

Taking the return to training easy, with short cardio sessions and weights well below usual. Does anyone have specific thoughts about heart rate? Given current lack of cardio fitness, it does raise quite high, and takes a while to recover.

Very grateful for any thoughts or recommendations for specialists in the field.

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Thanks chaps, but my cardiologist has said to ease into it. She's great, but being an NHS consultant means the wait for appointments is very long, and she doesn't really have any specific advice ref. exercise. I have previously exerted myself to a vastly higher degree, whilst fatigued/dehydrated/under actual pressure. Not at risk of dropping dead unexpectedly, and presumably would have done so before now if I had one of those conditions that does for the occasional footballer (assuming cardiologist is right about type of arrhythmia).

I'm using a HRM to keep an eye on rate, and keeping below 160. What I'd really like to do is discuss with a cardiologist specialising in sports & exercise the sorts of max rate/duration I should be at. Recommendations for specialists gratefully received.