Examkin

Soru

Zorluk: OrtaRheumatology and Immunology

Match each clinical vignette to the autoantibody profile most specific for the suspected underlying rheumatologic or autoimmune condition.

  • An evaluation is performed on a 42-year-old female patient complaining of severe fatigue, persistently puffy hands, and fingertips that turn white and painful in the cold. Blood work reveals overlapping characteristics of systemic lupus erythematosus, polymyositis, and systemic sclerosis.Anti-U1 ribonucleoprotein (RNP) antibodies
  • A 55-year-old male is admitted for progressive exertional dyspnea and proximal muscle weakness. Physical examination is notable for thickened, rough, and fissured skin along the lateral aspects of his index fingers and thumbs.Anti-Jo-1 (anti-histidyl-tRNA synthetase) antibodies
  • A 38-year-old female seeks medical attention for a chronic sensation of grittiness in both eyes and severe dry mouth requiring constant water intake. She also has newly noted, painless bilateral parotid gland swelling.Anti-Ro/SSA and anti-La/SSB antibodies
  • A 48-year-old female is evaluated for worsening heartburn and progressive skin thickening that now extends to her upper arms, chest, and abdomen. High-resolution chest computed tomography shows bibasilar reticular opacities.Anti-Scl-70 (anti-DNA topoisomerase I) antibodies
  • A 28-year-old female with a history of an unprovoked femoral vein thrombosis is seen in the clinic following her third consecutive spontaneous abortion at 14 weeks of gestation.Anticardiolipin and anti-beta-2-glycoprotein I antibodies

Cevap

The clinical vignettes describe Mixed Connective Tissue Disease (Anti-U1 RNP), Antisynthetase syndrome (Anti-Jo-1), Sjögren syndrome (Anti-Ro/La), Diffuse cutaneous systemic sclerosis (Anti-Scl-70), and Antiphospholipid syndrome (Anticardiolipin/Anti-beta-2-glycoprotein I).
Each vignette represents a classic USMLE presentation of a distinct rheumatologic disorder with a highly specific serologic marker. Mixed Connective Tissue Disease requires anti-U1 RNP. Antisynthetase syndrome features myositis, interstitial lung disease, and 'mechanic's hands' corresponding to anti-Jo-1. Sjögren syndrome's sicca symptoms map to anti-Ro/SSA and anti-La/SSB. Diffuse systemic sclerosis with pulmonary involvement maps to anti-Scl-70. Antiphospholipid syndrome's recurrent fetal loss and thrombosis correlate with anticardiolipin and anti-beta-2-glycoprotein I antibodies.

Adım Adım Çözüm

1
Analyze the first vignette to identify the combination of Raynaud phenomenon, puffy hands, and overlapping features of multiple connective tissue diseases.
Diagnose Mixed Connective Tissue Disease (MCTD), which is defined by the presence of anti-U1 RNP antibodies.
MCTD requires anti-U1 RNP for definitive classification alongside its characteristic overlapping clinical presentation.
2
Evaluate the second vignette featuring interstitial lung disease, myositis, and hyperkeratotic skin on the lateral fingers.
Identify 'mechanic's hands' and diagnose Antisynthetase syndrome, highly associated with Anti-Jo-1 antibodies.
Anti-Jo-1 is an antibody directed against histidyl-tRNA synthetase and is a hallmark of this specific inflammatory myopathy phenotype.
3
Review the third vignette describing severe dry eyes, dry mouth, and parotid gland enlargement.
Diagnose Sjögren syndrome, heavily correlated with Anti-Ro/SSA and Anti-La/SSB antibodies.
These antibodies target ribonucleoprotein complexes and are classic serologic markers for Sjögren syndrome.
4
Assess the fourth vignette demonstrating diffuse skin thickening extending to the trunk, along with bibasilar reticular opacities.
Diagnose diffuse cutaneous systemic sclerosis (SSc), linked to Anti-Scl-70 antibodies.
Anti-Scl-70 is specific to the diffuse subtype of SSc and is predictive of a higher likelihood of interstitial lung disease.
5
Examine the fifth vignette detailing unprovoked thrombosis and recurrent second-trimester pregnancy loss.
Diagnose Antiphospholipid syndrome, tested via Anticardiolipin and anti-beta-2-glycoprotein I antibodies.
These are part of the core diagnostic laboratory criteria for Antiphospholipid syndrome alongside lupus anticoagulant.

Anahtar Kavram

Correlation of specific serologic autoantibody profiles with their distinct rheumatologic clinical syndromes.
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Rheumatology and Immunology

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