Final answer:
The patient's symptoms indicate Felty syndrome, a complication of rheumatoid arthritis. This condition is characterized by arthritis, splenomegaly, and neutropenia. Rheumatic fever is the autoimmune heart disease arising from a streptococcal infection.
Step-by-step explanation:
Patient with Inflammatory Arthritis, Splenomegaly, and Neutropenia
The condition described, featuring inflammatory arthritis, splenomegaly, and neutropenia, is most likely Felty syndrome. This syndrome is a complication of rheumatoid arthritis, which manifests not only with arthritis but also with an enlarged spleen (splenomegaly) and a decreased number of neutrophils (neutropenia), a type of white blood cell. Behçet's disease, Sjögren's syndrome, and Takayasu arteritis are other types of autoimmune conditions that can have overlapping symptoms but do not typically present with this triad.
Autoimmune Diseases and the Heart
Regarding the autoimmune disease of the heart, the answer would be c. rheumatic fever, which arises as a sequela of streptococcal pharyngitis and can lead to heart complications including arthritis and carditis.