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224

M. Ghanem et al.

 

 

a

c

b

d

Fig. 14.1  (a) Heliotrope facial edema; (b) Fingers and Metacarpal swelling; (c) and (d): Chest computed tomography showing bilateral consolidations with ground glass opacities and a localized pneumothorax (arrowhead)

Systemic Lupus Erythematosus

Epidemiology

Systemic Lupus Erythematosus (SLE) is a chronic, systemic autoimmune disease that mostly affects young women. Classi cation criteria for SLE are presented in Fig. 14.2 [11]. SLE can present with a large spectrum of clinical manifestations in several organs (skin, joints, kidney, respiratory system), with a relapsing-remitting course [12]. The prevalence of SLE is 24/100,000, with an incidence of 1–8 cases/100,000 persons/year [13]. SLE can affect all lung compartments (Table 14.1); the pleura, the parenchyma, the airways, the pulmonary vasculature, and the respiratory muscles [14] with the prevalence of respiratory involvement throughout the course of the disease ranging from 20 to 90% [15, 16].

Pathophysiology

Lupus pathophysiology)involves genetic and environmental factors, which lead to a break of immune tolerance, resulting in an aberrant immune response against endogenous nuclear

antigens. Autoreactive B and T cells accumulate in secondary lymphoid organs and produce autoantibodies against multiple nuclear antigens, such as double-stranded DNA (dsDNA), RNP, Smith antigen, Ro, and La. These autoantibodies aggregate with the autoantigens and complement factors to form circulating immune complexes. The complexes deposit in target organs such as joints, skin, central nervous system, and/or kidneys to induce infammation and tissue injury [17]. Lymphocytic and mononuclear interstitial and peribronchiolar in ltrates can be present in SLE-associated ILD. Pulmonary manifestations are generally associated with disease activity, hypocomplementemia, and increased levels of anti-dsDNA, while interstitial involvement has been associated with anti-Ro and anti-U1RNP antibodies, and with scleroderma traits [15, 18].

Antinuclear antibodies (ANAs) are positive in virtually all patients with SLE (usually 1:160 or higher), but are also often found in other autoimmune diseases, infections, neoplasia, drug exposure, and in healthy individuals, especially the elderly. Anti-dsDNA presents lower sensitivity (66– 95%), but higher speci city, ranging from 75 to 100% and are linked to disease activity (Table 14.2). Anti-Smith (anti- ­Sm) are less sensitive (30%) but highly speci c (over 95%). Anti-Ro (SSA), anti-La (SSB),)and anti-RNP antibodies are

14  Lung Disease in Systemic Lupus Erythematosus, Myositis, Sjögren’s Disease, and Mixed Connective Tissue Disease

225

 

 

Entry Criterion

Antinuclear antibodies (ANA) at a titer of 1:80 on HEp-2 cells or an equivalent positive test (ever)

 

Yes

No

 

 

 

 

 

 

 

 

 

Additive criteria

No SLE

1 clinical criterion and 10 points

Within each domain, only the highest weighted criterion is counted toward the total score

Criteria do not need to occur simultaneously

SLE diagnosis: entry criterion + 10 points

Additive criteria:

Clinical Domains

 

Weight

 

Immunological Domains

 

Weight

 

 

 

 

 

 

 

 

 

 

Constitutional

 

 

 

Antiphospholipid antibodies

 

 

 

 

 

 

 

 

 

Fever

 

2

 

Anti-cardiolipinantibodies or Anti2GP1

 

2

 

 

 

 

antobodies or Lupus anticoagulant.

 

 

 

 

 

 

 

 

 

Hematologic

 

 

 

Complement proteins

 

 

 

 

 

 

 

 

 

Leucopenia

 

3

 

Low C3 or C4

 

3

 

 

 

 

 

 

 

Thrombocytopenia

 

4

 

SLE-specific Antibodies

 

 

 

 

 

 

 

 

 

Autoimmune Hemolysis

 

4

 

Anti-dsDNA antibody or Anti-Smith

 

6

 

 

 

 

antibody

 

 

 

 

 

 

 

 

 

Mucocutaneous

 

 

 

 

 

 

 

 

 

 

 

 

 

Non-scarring alopecia

 

2

 

 

 

 

 

 

 

 

 

 

 

Oral ulcers

 

2

 

 

 

 

 

 

 

 

 

 

 

Subacute cutaneous or

 

4

 

 

 

 

discoid lupus

 

 

 

 

 

 

 

 

 

 

 

 

 

Acute cutaneous

 

4

 

 

 

 

 

 

 

 

 

 

 

Serosal

 

 

 

 

 

 

 

 

 

 

 

 

 

Pleural or pericardial effusion

 

5

 

 

 

 

 

 

 

 

 

 

 

Acute pericarditis

 

6

 

 

 

 

 

 

 

 

 

 

 

Musculoskeletal

 

 

 

 

 

 

 

 

 

 

 

 

 

Joint Involvement

 

6

 

 

 

 

 

 

 

 

 

 

 

Renal

 

 

 

 

 

 

 

 

 

 

 

 

 

Proteinuria >0.5gr/24h

 

4

 

 

 

 

 

 

 

 

 

 

 

Renal biopsy class II or V

 

8

 

 

 

 

lupus nephritis.

 

 

 

 

 

 

 

 

 

 

 

 

 

Renal biopsy III or IV lupus

 

10

 

 

 

 

nephritis

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 14.2  2019 European League Against Rheumatism (EULAR)/American College of Rheumatology (ACR) Classi cation Criteria for Systemic Lupus Erythematosus (SLE). (Modi ed from [11]). Anti-β2GPI anti–β2-glycoprotein I, anti-dsDNA anti–double-stranded DNA

Table 14.1  Pulmonary involvement in systemic lupus erythematosus (SLE), Sjögren’s syndrome (SS), mixed connective tissue disease (MCTD), and myositis

 

 

SLE

Sjögren’s

MCTD

Myositis

Parenchyma (ILD)

 

+

++

++

+++

 

 

 

 

 

 

Histology

 

NSIP > OP > UIP

NSIP > UIP > LIP > OP

NSIP

NSIP > OP > UIP > DAD

 

 

 

 

 

 

Vessels/PH

 

++

+

++

+++

 

 

 

 

 

 

DAH

 

+

_

_

+

 

 

 

 

 

 

Pleura

 

+++

+

+

+

Airways

 

+

++

+

 

Table 14.2  Most common antibodies associated with each connective tissue disease

 

 

 

 

 

 

 

 

Antibodies

 

 

 

 

 

SLE

ANAs (high sensitivity but low speci city) anti-dsDNA, antiSm, anti-Ro(SSA), anti-La(SSB)

Sjögren’s

Anti-Ro(SSA), anti-La(SSB)

 

 

 

 

 

 

 

 

MCTD

Anti-U1snRNP

 

 

 

 

 

Myositis

•  Myositis-speci c autoantibodies, anti-tRNA synthetase; anti-Jo-1 (PL1), anti-PL7, anti-PL12, anti-KS, anti-OJ, anti-EJ,

 

anti-SC, anti-JS, anti-YRS (ha), anti-zo

 

 

 

•  Dermatomyositis-speci c autoantibodies; anti-Mi2, anti-NXP2 (MJ, p140), anti-MDA5 (CADM-140), anti-TIF-1γ

 

(p155/140)

 

 

 

 

•  Other myositis-speci c autoantibodies; anti-SRP, anti-HMGR (200–100), anti-SAE

 

 

•  Myositis-associated autoantibodies; anti-Ro/SSa, anti-U1RNP, anti-PM/Scl, anti-Ku

 

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