Sjögren's Disease¶
Chapter 373 | Part 11: Immune-Mediated, Inflammatory, and Rheumatologic Disorders
KEY CLINICAL POINTS¶
- Sjögren's disease is a prototype autoimmune disorder characterized by lymphocytic infiltration of exocrine glands and B-cell hyperactivity, leading to xerostomia and keratoconjunctivitis sicca.
- Prevalence is ~0.5–1% with a female-to-male ratio of 10–20:1; 5–20% of autoimmune patients may develop sicca manifestations.
- Extraglandular manifestations include lung involvement (14%), renal disease (9%), peripheral neuropathy (2%), and lymphoma (6%).
- Diagnosis requires major and minor criteria (2016 ACR/EULAR classification) including sicca symptoms, autoantibodies, and lab findings.
- Treatment focuses on symptom relief with artificial tears, saliva substitutes, and avoiding anticholinergics; immunosuppressants may be used for severe cases.
1. DEFINITION & OVERVIEW¶
Sjögren’s disease is a chronic autoimmune disorder characterized by lymphocytic infiltration of exocrine glands (salivary, lacrimal) and B-cell hyperactivity. It presents with dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia), and may progress to systemic involvement. The disease has a wide clinical spectrum from organ-specific to systemic manifestations, often associated with other autoimmune diseases like RA, SLE, and scleroderma.
Table 373-1: Prevalence of Extraglandular Manifestations in Primary Sjögren’s Disease¶
| CLINICAL MANIFESTATION | PERCENT | REMARKS |
|---|---|---|
| Nonspecific | ||
| Fatigability/myalgias | 25 | Fibromyalgia |
| Arthralgias/arthritis | 60 | Usually nonerosive, leading to Jaccoud’s arthropathy |
| Raynaud’s phenomenon | 37 | In one-third of patients, precedes sicca manifestations |
| Periepithelial | ||
| Lung involvement | 14 | Small airway disease/lymphocyte interstitial pneumonitis |
| Kidney involvement | 9 | Interstitial kidney disease is usually asymptomatic |
| Liver involvement | 6 | Primary biliary cirrhosis stage I |
| Immune complex–mediated |
| CLINICAL MANIFESTATION | PERCENT | REMARKS |
|---|---|---|
| Small vessel vasculitis | 9 | Purpura, urticarial lesions |
| Peripheral neuropathy | 2 | Polyneuropathy, either sensory or sensorimotor |
| Glomerulonephritis | 2 | Membranoproliferative |
| Lymphoma | ||
| Lymphoma | 6 | Glandular MALT lymphoma is most common |
1.1 Clinical Spectrum¶
The disease ranges from localized sicca symptoms to systemic involvement, including interstitial lung disease, renal tubular acidosis, peripheral neuropathy, and lymphoma. It is the autoimmune disease with the highest lymphoma risk.
1.2 Genetic Factors¶
Genetic loci include HLA-DQA1*0501, IRF5, STAT4, BAFF, EBF1, and BLK. Combined deficiencies in the classical complement pathway are also implicated.
2. EPIDEMIOLOGY¶
Sjögren’s disease affects ~0.5–1% of the population, with a female-to-male ratio of 10–20:1. It typically occurs in middle-aged women but may present at any age. 5–20% of patients with other autoimmune diseases may develop sicca manifestations. The disease is more common in patients with prior major stressful life events.
2.1 Demographics¶
Predominantly affects middle-aged women (10–20:1 female-to-male ratio). Can occur at any age, including pediatric cases.
2.2 Risk Factors¶
Genetic predisposition (HLA-DQA1*0501, IRF5, STAT4), environmental triggers (viral infections, hormonal changes), and prior major stressful life events.
3. ETIOLOGY & PATHOPHYSIOLOGY¶
Sjögren’s disease involves lymphocytic infiltration of exocrine glands and B-cell hyperactivity. Pathogenesis includes endogenous triggers (intracellular stress, nucleic acid overexpression) and exogenous factors (viruses, hormones) interacting with a hyperactive immune response. Ductal/acinar epithelial cells express costimulatory molecules and produce proinflammatory cytokines, contributing to autoimmune injury.
Table 373-2: Differential Diagnosis of Sicca Symptoms¶
| XEROSTOMIA | DRY EYE | BILATERAL PAROTID GLAND ENLARGEMENT |
|---|---|---|
| Viral infections (HCV, HIV) | Viral infections | Viral infections (HCV, HIV) |
| Drugs | Inflammation | Drugs |
| XEROSTOMIA | DRY EYE | BILATERAL PAROTID GLAND ENLARGEMENT |
|---|---|---|
| Psychotherapeutic syndrome | Stevens-Johnson syndrome | Psychotherapeutic |
| Parasympatholytic | Pemphigoid | Parasympatholytic |
| Antihypertensive | Chronic conjunctivitis | Antihypertensive |
| Psychogenic origin | Chronic blepharitis | Psychogenic origin |
| Irradiation | Sjögren’s Disease | Irradiation |
| Diabetes mellitus | Toxicity | Diabetes mellitus |
| Trauma | Burns | Trauma |
| Sjögren’s disease | Drugs | Sjögren’s disease |
| Amyloidosis | Neurologic conditions | Amyloidosis |
| Autoimmune thyroid disease | Impaired lacrimal gland function | Autoimmune thyroid disease |
3.1 Autoimmune Mechanisms¶
Lymphocytic infiltration of salivary/lacrimal glands, B-cell hyperreactivity (hypergammaglobulinemia, autoantibodies to Ro/SSA, La/SSB). Activated T lymphocytes and dendritic cells drive chronic inflammation.
3.2 Genetic and Environmental Interactions¶
Genetic susceptibility (HLA-DQA1, IRF5, BAFF) interacts with viral infections (HCV, HIV), hormonal triggers, and stress to initiate disease. Epigenetic abnormalities and type I/II interferon pathways contribute to B-cell activation.
4. CLINICAL FEATURES¶
Primary symptoms include dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia). Extraglandular manifestations include interstitial lung disease, renal tubular acidosis, peripheral neuropathy, and lymphoma. Physical findings include a dry, fissured tongue and parotid gland enlargement.
Table 373-3: Differential Diagnosis of Sjögren’s Disease¶
| HIV INFECTION AND SICCA SYNDROME | SJÖGREN’S DISEASE | SARCOIDOSIS |
|---|---|---|
| Predominant in young males | Predominant in middle-aged women | No age or sex preference |
| Presence of autoantibodies | ||
| Lymphoid infiltrates of salivary glands by CD8+ T lymphocytes | Lymphoid infiltrates of salivary glands by CD4+ T lymphocytes | Granulomas in salivary glands |
| Association with HLA-DR3 and DRw52 | ||
| Positive serologic tests for HIV | Negative serologic tests for HIV | Negative serologic tests for HIV |
4.1 Localized Symptoms¶
Dry eyes (sandy/gritty sensation, photophobia), dry mouth (difficulty swallowing, burning sensation, dental caries). Physical exam reveals a dry, erythematous oral mucosa with atrophic filiform papillae.
4.2 Systemic Manifestations¶
Lung involvement (dry cough, interstitial pneumonitis), renal tubular acidosis, peripheral neuropathy, and lymphoma (MALT lymphoma).
5. DIFFERENTIAL DIAGNOSIS¶
Differential diagnoses include HIV-associated sicca syndrome, sarcoidosis, and other autoimmune diseases. Key distinguishing features include the presence of autoantibodies (Ro/SSA, La/SSB), lymphoid infiltration patterns, and clinical presentation.
5.1 Key Differentiators¶
Sjögren’s disease shows CD4+ T-cell lymphoid infiltration, while sarcoidosis has granulomas and HIV-associated sicca lacks autoantibodies. The 2016 ACR/EULAR criteria help distinguish these entities.
6. INVESTIGATIONS & DIAGNOSIS¶
Diagnosis requires major (sicca symptoms, labial biopsy) and minor criteria (autoantibodies, imaging). Investigations include Schirmer’s test, sialometry, MRI, and lab tests for autoantibodies and complement levels.
Table 373-1: Prevalence of Extraglandular Manifestations in Primary Sjögren’s Disease¶
| CLINICAL MANIFESTATION | PERCENT | REMARKS |
|---|---|---|
| Nonspecific | ||
| Fatigability/myalgias | 25 | Fibromyalgia |
| Arth,algias/arthritis | 60 | Usually nonerosive, leading to Jaccoud’s arthropathy |
| Raynaud’s phenomenon | 37 | In one-third of patients, precedes sicca manifestations |
| Periepithelial | ||
| Lung involvement | 14 | Small airway disease/lymphocyte interstitial pneumonitis |
| Kidney involvement | 9 | Interstitial kidney disease is usually asymptomatic |
| Liver involvement | 6 | Primary biliary cirrhosis stage I |
| Immune complex–mediated | ||
| Small vessel vasculitis | 9 | Purpura, urticarial lesions |
| Peripheral neuropathy | 2 | Polyneuropathy, either sensory or sensorimotor |
| Glomerulonephritis | 2 | Membranoproliferative |
| Lymphoma | ||
| Lymphoma | 6 | Glandular MALT lymphoma is most common |
6.1 Diagnostic Criteria¶
2016 ACR/EULAR classification criteria: Major criteria (sicca symptoms, labial biopsy), minor criteria (autoantibodies, imaging, lymphadenopathy).
6.2 Laboratory Tests¶
Schirmer’s test, tear breakup time, sialometry, MRI, serum autoantibodies (Ro/SSA, La/SSB), and complement levels.
7. MANAGEMENT & TREATMENT¶
Symptomatic management includes artificial tears, saliva substitutes, and avoiding anticholinergics. Immunosuppressants (e.g., methotrexate, rituximab) may be used for severe cases. Lymphoma requires targeted therapy.
7.1 Symptomatic Relief¶
Artificial tears (hydroxypropyl methylcellulose), saliva substitutes, pilocarpine (5 mg TID), cevimeline (30 mg daily). Avoid diuretics, antihypertensives, and anticholinergics.
7.2 Immunosuppressive Therapy¶
Methotrexate, rituximab, or mycophenolate mofetil for severe systemic disease. FDG-PET/CT for lymphoma detection.
8. PROGNOSIS & COMPLICATIONS¶
Most patients have a benign course, but 6% develop lymphoma. Complications include renal tubular acidosis, interstitial lung disease, and cardiovascular risk. Early detection of lymphoma improves prognosis.
8.1 Lymphoma Risk¶
Sjögren’s disease has the highest lymphoma risk among autoimmune diseases. Risk factors include B symptoms, large lymph node mass, and high histologic grade.
9. SPECIAL CONSIDERATIONS¶
Pregnancy: Monitor for renal tubular acidosis. Pediatrics: Consider viral triggers. Elderly: Monitor for lymphoma. Patients with HIV or sarcoidosis require differential diagnosis.
9.1 Pregnancy¶
Monitor for renal tubular acidosis and avoid anticholinergics. No increased fetal risk.
10. KEY POINTS & CLINICAL PEARLS¶
Sjögren’s disease is diagnosed using 2016 ACR/EULAR criteria. Lymphoma risk is highest in patients with B symptoms and large lymph nodes. Avoid anticholinergics. Use FDG-PET/CT for lymphoma detection. Salivary gland ultrasound is a key diagnostic tool.