Well, it's possible it's MG. Did your cardiologist do a 24-hour holter? What tests did he do?

What I think you need to do is see a pulmonologist. Again, don't expect your neuro to be one. It might be time for a sleep study or at least an overnight oximetry. Muscles get weaker when you sleep, so you have to know if you are hypoxic (not enough oxygen) or not. Very bad for the body, especially the brain, heart and kidneys, to be hypoxic.

Sometimes they do an oximetry for 24 hours, to see if you are having dips during the day too. Then the report can be sent to your neuro. Sometimes pulmys do sleep studies, sometimes neuros but an oximetry is usually done by the pulmys. Oy.

You could always ask your primary doctor to make sure other things aren't off like electrolytes or thyroid or other possible causes. Those things can cause you to have arrhythmias too. The cause of arrhythmias isn't always the heart.

Beta blockers are relatively contraindicated in MG. Some people take them but you need to be aware of that. Also, it can be hard to get off of these drugs. So it's best to at least TRY to find a cause, if one can be found, first.

It's harder for the muscles at night to "kick in" because they are weaker when you sleep. It may help to sit up on your bed for a minute before walking to the bathroom. Do you drink water after you go? Being dehydrated is not good for the body. Also, getting up to pee a lot at night could be a sign of apnea or hypoxia too.

When the body can't get oxygen, the heart speeds up to try to get it for you. It's a normal process but it means that something else is going on, like lower O2.

I hope you can figure it out. Whatever is causing your O2 saturation to drop, it's not normal! They body is kind of funny . . . it doesn't like being deprived of oxygen.


Annie