Yes, it is true that having Steinert's myotonic dystrophy can cause problems with anesthesia. This is why it is very important to make sure that the specialists and the anesthesiologist have taken into account that you have this disease, in order to prevent risks and be prepared for possible complications.
In addition, it is advisable to perform a respiratory evaluation of the patient with Steinert's myotonic dystrophy prior to general anesthesia.