For myasthenia gravis patients is. bipap machine better than cpap?

Depends on person: While CPAP is very helpful in patients with obstructive sleep apnea, myasthenic patients tend to have overall respiratory weakness and do benefit from bipap to a greater degree. That being said, a sleep study can be invaluable in determining the right treatment for each individual.

Possibly: The mechanism of Bipap often makes it more suitable for MG patients. Your sleep MD, after assessment of your sleep studies, can tailor the best approach for you.