Tachycardia - palps - ecg query

[Emcat]

Hello,

I am a 27 yr old female and I have been having palpitations that came on v suddenly last July, at the time i had atrial tachycardia and sinus tachycardia, and an MRI scan in November showed fibrosis (despite my blood tests all being normal, is this weird?) and so I must have had myocarditis, i was v unwell and factigued for 5 weeks then i was able to return to work, thos inappropriate sinus tachycardia, chest pain, SOB and dizziness has persisted. I was a regular runner prior to all this and in v good health. I have since been put on Ivabradine, and have been seen my cardiologists who say i am still suffering a hangover from the infection. Am also seeing a dysautonmic consultant as i do have quite odd symptoms from time to time and a lot of the time i have this feeling of not being able to breathe and almost like a pressure on my chest - this feeling comes and goes. All Echo scans have been fine tho.
My question is this, i still have some palps that holter monitors have not managed to record, e,g, a feeling like my heart has suddenly paused where i feel like i will faint, but I know it isnt an ectopic as i dont get the thump after the pause and my heart just resumes normal rythm instead, and also when i am going to sleep sometimes my heart feels like it is like changing gear and shifts rhythm a bit. They gave me a 10 lead 24 hr ecg last week, and TYPICALLY my heart behaved itself the whole time. They have now given me a 7 day 3 lead ecg, will this show as much detail as to what is going on that the 24hr 10 lead one would have?
Also, my QSR complex varies from 93 to 106, i know these numbers are within normal ranges, but should your QSR complex vary so much?
And lastly, i had a 12 lead ecg last week that showed a bifid p wave? What does this mean?

Thanks for reading.

Emma

[kenkeith]

the ECG represent the sequence of chamber contractions and the time of the rest period between contractions and should vary within the normal heart rate at rest.  

Bifid broad P waves suggests left atrial hypertrophy and that could be due to mitral valve stenosis.  The opening is narrower than normal, and the atrium can enlarge due to the increased pressure required to pump the blood to the lower ventricle, could be other causes as well.

Thanks for sharing and if you have any further questions or comments you are welcome to respond.  take care,

Ken