Medicine
A 28-year-old woman presented to the clinic with 2-month history of pain and swelling in the hand joints with…
A 28-year-old woman presented to the clinic with 2-month history of pain and swelling in the hand joints with morning stiffness for 2-hours. She is 3-months postpartum, and taking care of her infant. On examination, she has active arthritis at second and fourth proximal and metacarpophalangeal joints and both wrists (see lab results). Test Result Normal Values Hb 120 130-170 g/L (Male) 120-160 g/L (Female) Platelets count 450 150-400 x 109/L WBC 6 4.5-10.5 x 109/L ESR 70 2-10 mm/h (Male) 3-15 mm/h (Female) C-reactive peptide 18 <8.2 mg/L Which of the following is the most likely diagnosis?
Explanation
Core Concept: Rheumatoid arthritis (RA), a chronic systemic autoimmune inflammatory disease primarily affecting the synovial joints. The postpartum period is a known trigger for the onset or exacerbation of autoimmune conditions due to immune reconstitution.
Clinical Presentation:
- Symmetrical polyarthritis involving the small joints of the hands (MCP, PIP, wrists), prolonged morning stiffness (>1 hour), and elevated inflammatory markers (ESR, CRP, reactive thrombocytosis).
- Complications: Joint deformities, erosions, cervical spine instability, and systemic manifestations.
Diagnosis:
- First-line: Rheumatoid factor (RF), anti-CCP antibodies, and X-rays of the hands/feet.
- Gold standard: Clinical diagnosis based on ACR/EULAR classification criteria incorporating joint involvement, serology, and acute phase reactants.
Management:
- Acute: NSAIDs or low-dose corticosteroids as bridge therapy for rapid symptom relief.
- Long-term/Definitive: Early initiation of Disease-Modifying Antirheumatic Drugs (DMARDs). Methotrexate is the gold standard anchor drug (though alternatives like sulfasalazine or hydroxychloroquine are preferred if the patient is actively breastfeeding).