Rheumatology and Immunology

A 54-year-old man presents to the clinic with a 3-month history of profound fatigue, intermittent joint pain in his hands, and a recurrent rash on his lower legs. He has a past medical history of a brief period of intravenous drug use in his early twenties. He currently takes no medications. Vital signs are within normal limits. Physical examination reveals a non-blanching, palpable purpuric rash over the bilateral shins and ankles. There is mild symmetric tenderness and swelling of the metacarpophalangeal and proximal interphalangeal joints.

Laboratory evaluation is as follows:

Urinalysis shows 2+ protein, $15-20$ red blood cells/hpf, and occasional red blood cell casts.

Which of the following is the most appropriate next step in the diagnostic evaluation of this patient?

Match each patient's clinical presentation with the myositis-specific autoantibody that is most strongly associated with their clinical phenotype.

Match each clinical scenario describing a medication adverse effect or monitoring requirement in a patient with a rheumatologic condition to the most likely responsible pharmacologic agent.

An obese 58-year-old male with a 5-year history of essential hypertension arrives at the urgent care center due to intense, throbbing pain in his left foot that began abruptly during the night. He reports that even the weight of his bedsheet on the foot causes excruciating discomfort. His vital signs are within normal limits. Examination reveals a markedly swollen, red, warm, and tender left first metatarsophalangeal joint. The overlying skin is tense but intact, with no evidence of puncture wounds or purulent drainage. Which of the following is the most appropriate next step in the management of this patient's acute symptoms?

A 42-year-old woman presents to the rheumatology clinic with a 4-month history of bilateral, symmetrical pain, swelling, and severe morning stiffness in her metacarpophalangeal and proximal interphalangeal joints. Arrange the following clinical actions in the correct chronological sequence for the long-term diagnostic workup and stepwise pharmacological management of this patient's condition, reflecting standard escalation of therapy.

A 26-year-old man comes to the clinic for a follow-up evaluation of chronic lower back pain. His symptoms began 2 years ago, are typically worse in the morning, and improve with exercise but not with rest. He often wakes up in the second half of the night due to the pain. Physical examination shows limited forward flexion of the lumbar spine with a modified Schober test of 2 cm. Magnetic resonance imaging of the sacroiliac joints demonstrates active osteitis indicative of bilateral sacroiliitis. Laboratory studies show a positive HLA-B27. A diagnosis of ankylosing spondylitis is established. The patient asks about the long-term therapeutic plan, understanding that initial treatments might not be fully effective over time.

Arrange the following interventions and clinical protocols in the correct chronological sequence for the escalation of therapy in this patient, assuming an inadequate clinical response to each prior step.

A 42-year-old woman is newly diagnosed with limited cutaneous systemic sclerosis. She is highly anxious about the potential progression of her Raynaud phenomenon, which currently manifests as mild, infrequent vasospastic episodes triggered by cold exposure. During her clinic visit, she asks about the long-term management strategy for this condition if her symptoms worsen over time. You outline a stepwise therapeutic escalation pathway. Arrange the following management steps in the correct chronological order of therapeutic escalation, from the initial foundational intervention to the final rescue treatment for medically refractory, critical digital ischemia.

A 45-year-old woman presents to the clinic reporting pain and swelling in her wrists and the knuckles of both hands for the past 3 months. She mentions that her joints feel extremely stiff when she wakes up, typically taking about two hours to loosen up. Physical examination reveals tender, boggy swelling of the bilateral metacarpophalangeal and proximal interphalangeal joints. Initial laboratory testing is notable for an elevated erythrocyte sedimentation rate and a positive rheumatoid factor. Which of the following is the most appropriate initial disease-modifying pharmacotherapy for this patient?

A 24-year-old man is diagnosed with active ankylosing spondylitis characterized by progressive inflammatory back pain, elevated inflammatory markers, and severe morning stiffness. Arrange the following therapeutic interventions in the standard chronological sequence for escalating disease management, from initial first-line therapy to end-stage treatment.

A clinic evaluates a 55-year-old male who developed sudden, severe right knee swelling and pain 48 hours ago. He denies any recent trauma, falls, or prior joint issues. His current temperature is 38.2°C (100.8°F). Examination reveals a visibly enlarged, erythematous right knee that is exquisitely tender to palpation. Range of motion is severely limited by pain. Which of the following is the most appropriate initial step in the evaluation of this patient?

Match each advanced biologic or targeted synthetic disease-modifying antirheumatic drug (DMARD) with its most characteristic severe adverse effect or specific clinical contraindication.

Match each clinical scenario describing a medication-specific toxicity, mechanism, or required screening protocol to the appropriate disease-modifying medication used in rheumatologic conditions.

Pair each patient's key clinical findings with the most appropriate rheumatologic or vasculitic diagnosis.

Match the following rheumatologic autoantibodies with their most characteristic clinical phenotypes and prognostic associations.

Match each patient's clinical presentation with the most characteristic diagnostic or pathologic finding associated with their underlying condition.

A 35-year-old woman is evaluated for a 1-year history of her fingers turning white, then blue, and finally red when she takes food out of the freezer. She has also noticed some tightness in the skin of her hands. The patient is diagnosed with secondary Raynaud phenomenon.

Arrange the following interventions in the standard step-wise order of therapy, from the initial recommendation to the final escalation for severe, tissue-threatening disease.

A 45-year-old woman is newly diagnosed with seropositive rheumatoid arthritis involving her metacarpophalangeal and proximal interphalangeal joints. According to standard clinical guidelines, arrange the following therapeutic interventions in the correct chronological sequence of escalation, starting from the initial medical management to the treatment of advanced, medically refractory disease.

Match each clinical presentation of a systemic autoimmune condition with its most highly associated specific autoantibody.

Correlate the following clinical patient profiles with their most likely underlying systemic rheumatologic diagnosis and associated extra-articular complication.

An occupational therapist in her late fifties is brought to the emergency department by her partner due to sudden-onset high fever, profound weakness, and bleeding gums over the last $48\text{ hours}$. She has a documented history of severe, erosive rheumatoid arthritis that has been clinically silent for the past two years on a maintenance regimen of azathioprine and low-dose prednisone. She also takes sertraline for generalized anxiety disorder.

Three weeks ago, she experienced a severely painful, swollen, and erythematous right first toe. Arthrocentesis yielded fluid containing negatively birefringent, needle-shaped crystals. Following resolution of the acute episode, her rheumatologist initiated a daily prophylactic medication to prevent future articular attacks.

Upon arrival today, her temperature is $39.5^\circ\text{C}$ ($103.1^\circ\text{F}$), pulse is $118\text{/min}$, and blood pressure is $100/60\text{ mmHg}$. Physical examination reveals marked mucosal pallor, diffuse lower extremity petechiae, and continuous oozing from the gingival margins.

Laboratory findings:
Leukocytes: $750/\text{mm}^3$
Hemoglobin: $6.8\text{ g/dL}$
Platelets: $14,000/\text{mm}^3$
Thyroid-stimulating hormone: $3.9\text{ \mu U/mL}$ (Normal: $0.4-4.2\text{ \mu U/mL}$)
Free thyroxine (T4): $1.2\text{ ng/dL}$ (Normal: $0.8-2.8\text{ ng/dL}$)

Which of the following mechanisms is the most likely primary cause of this patient's current hematologic crisis?