Hi . I can't personally speak to this comorbidity, but, in case you were not aware, I want to share with you that the Cleveland Clinic has a Gastroparesis Clinic. Here is an interview with the director of the clinic discussing the condition and the impact of autoimmune conditions, including RA: https://my.clevelandclinic.org/podcasts/butts-and-guts/gastroparesis-and-the-impact-of-autoimmune-diseases.
Also, I want to share with you that we have a sister-site for rare diseases at https://raredisease.net/ where you may want to inquire further on gastroparesis: https://raredisease.net/. Wishing you the best. Richard (RheumatoidArthritis.net Team)