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DavrosT
I have to say that after I developed some food allergies a couple of years ago just out the blue, I had to change my diet because the bloating and stomach issues were making the ectopics worse too.

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GeorgeN
Nasal breathing has been a focus of mine for a long time. I use it as a signal as to whether my exercise is too intense (if I have to open my mouth). I also tape my mouth shut at night to clean up apnea patterns that showed up in an overnight heart rate vs. time recording. I've posted about breathing a number of times:

Mouth taping at night

Breathing to convert to NSR

Breathing instruction & meditation

Other breathing references

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JoeM
I had this exact experience just last night whereby I noted a strong connection between breathing and ectopics/low HR Afib. I was able to control ectopics and restore sinus rhythm by deliberate breathing or short breath holds. I also had the very odd sensation of fluttering in chest, but an apparently normal sinus HR in the low 50s. All very vagal symptoms. I have also noted a strong connection to even minor gastric pressure/burps and palpitations. I was a 5 episode/year vagal afibber for 6 years until a routine colonoscopy a month ago. My Afib has gotten dramatically worse since with a dozen mostly nighttime episodes since.... Time to visit an EP I think, as I only have consulted with a cardiologist to date who gave me pill in pocket Metoprolol and Flecainide.

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Pompon
Mouth-breathing irregularly, like I do while singing, can bring me ectopics.
Karaoke is my enemy.