Melissa, I'm sorry you are dealing with another health issue. Though that's great you aren't on any MG drugs right now.

It is possible you had the murmur prior to surgery. It's not always an exact science figuring out if someone has a murmur, according to my cardiologist. A lot depends on the expertise of the technician doing the echocardiogram, which is the main way they figure out if you have a murmur. Did you have an echocardiogram before your surgery? They would not "see" a murmur on a CT scan. I have a PFO (small hole in my heart) that wasn't seen until I was 42. It won't show up on an ECG either.

Do you know if any other waveform (like the T wave) looked "lower?" I'm asking because a normal p wave may look like it's not there if you are dehydrated. All waves tend to get lower if you are. I would bet that the first thing the cardiologist does is to set up an echocardiogram. Maybe even a 24-hour holter monitor.

Here are some basic articles. Try not to be overwhelmed by any of it! Understanding some heart basics helps.

http://www.cvphysiology.com/Arrhythmias/A009.htm

http://www.fpnotebook.com/CV/Exam/PWv.htm

http://www.americanheart.org/present...?identifier=55

Murmurs can upset the electrical conduction in the heart. So can an electrolyte disturbance (either too much or not enough of one), like Sue said. Nice thought, Sue!

Are you on any supplements?

Any other medical conditions? Have you had your thyroid checked lately? Chem panel, showing electrolytes and liver/kidney function? You'd be surprised how easy it is to have an electrolyte imbalance. Simply a vitamin D deficiency can cause all kind of problems, something a lot of people have.

Try not to worry too much. If it was urgent, you'd be in a hospital right now. If any other symptoms come up, call your doc or go in!

Annie