Journal List > J Korean Rheum Assoc > v.17(2) > 1003714

Kim, Kim, Kim, Sohn, Jung, Choi, Sung, Jun, Uhm, Kim, Bae, and Yoo: Clinicial Significance of Spontaneous Pneumomediastinum in Dermatomyositis/Polymyositis

Abstract

Objective

Pneumomediastinum (PnM), a rare complication of dermatomyositis and polymyositis (DM/PM), is sporadic and has an unclear pathogenesis. PnM is almost always associated with interstitial lung disease (ILD), and is a poor prognostic factor in inflammatory myositis patients. We studied the prevalence of PnM in Korean DM/PM and its clinical significance.

Methods

We retrospectively studied the medical records of 161 patients diagnosed with DM/PM meeting Bohan-Peter's criteria at Hanyang University Hospital for Rheumatic Diseases from 1995 to 2010. We collected following findings; demographic data, diagnosis, lung involvement, cause of death, and duration from diagnosis to death.

Results

One hundred nineteen patients (73.9%) were DM and 42 patients (26.1%) were PM. Eighty three patients (51.6%) developed ILD at diagnosis or during follow up. Eighteen patients (11.2%) died because of ILD aggravation, infection, or malignancy. The mean duration from diagnosis to death was 11.5 months, with 10 patients (6.2%) dying from from ILD aggravation but none with spontaneous PnM. 6 patients (3.7%) presented with PnM, and it was associated with ILD worsening in all cases. PnM resolved with O2 inhalation, corticosteroids, and/or immunosuppressive agents after 11 weeks (mean) of therapy

Conclusion

PnM is rare but associates with DM and aggravation of ILD. PnM does not usually cause fatalities and can be cured by appropriate therapy.

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Classification and patterns of Interstitial lung disease
Morphologic pattern Clinical diagnosis Histologic features Imaging features
Usual interstitial pneumonia Idiopathic pulmonary fibrosis Spatial and temporal heterogeneity, dense fibrosis, fibroblastic foci, honeycombing Basal, peripheral predominance, often patchy, reticular abnormality, honeycombing
Nonspecific interstitial pneumonia Nonspecific interstitial pneumonia Spatially and temporally homogeneous lung fibrosis or inflammation Basal predominance, ground-glass abnormality, reticular abnormality
Desquamative interstitial pneumonia Desquamative interstitial pneumonia Diffuse macrophage accumulation in alveoli Basal, peripheral predominance ground-glass attenuation; sometimes cysts
Respiratory bronchiolitis Respiratory bronchiolitis-associated interstitial lung disease Peribronchiolar macrophage accumulation, bronchiolar fibrosis; macrophages have dusty, brown cytoplasm Centrilobular nodules, ground-glass attenuation
Organizing pneumonia COP, BOOP Patchy distribution of intraluminal organizing fibrosis in distal airspaces; preservation of lung architecture; uniform temporal appearance; mild interstitial chronic inflammation Ground-glass attenuation; consolidation basal, peripheral predominance
Diffuse alveolar damage Acute interstitial pneumonia Diffuse distribution, uniform temporal appearance, alveolar septal thickening due to organizing fibrosis, airspace organization, hyaline membranes Diffuse, ground-glass attenuation, consolidation
Lymphoid interstitial pneumonia Lymphoid interstitial pneumonia Diffuse lymphoplasmacytic infiltration of alveolar septa Ground-glass attenuation, cysts

COP: cryptogenic organizing pneumonia, BOOP: bronchiectasis obliterans with organizing pneumonia

Characteristics of dermatomyositis/polymyositis patients
Dermatomyositis Polymyositis
Numbers of patients 119 (73.9%) 42 (26.1%)
Mean age at diagnosis (years) 43.6 (6~75) 38.7 (16~75)
Mean period of follow up (months) 26.6 (1~155) 32.6 (1~121)
Female/Male 94/25 36/6
Interstitial lung disease 69 (42.9%) 14 (33.3%)
Malignancy 11 (9.2%) 2 (4.8%)
Death causes 16 (13.4%) 2 (4.8%)
Interstitial lung disease 9 1
Malignancy 4 1
Sepsis 3
Radiologic classification of interstitial lung disease
IPF BOOP NSIP AIP Mixed Unknown
Numbers 14 30 25 1 8 5
Result
Alive (PnM) 14 26 (4) 23 (1) 0 4 (1) 5
Expire 0 4 2 1 4 0

IPF: idiopathic pulmonary fibrosis, BOOP: bronchiectasis obliterans with organizing pneumonia, NSIP: non-specific interstitial pneumonitis, AIP: acute interstitial pneumonitis, PnM: pneumomediastinum

Clinical course of interstitial lung disease among dermatomyositis/polymyositis patients
No interval change Slow progression Rapid progression Unknown
Numbers 51 17 10 5
Result
Alive (PnM) 51 16 (6) 0 5
Expire 1 10 0

PnM: pneumomediastinum

Characteristics of 6 cases of spontaneous pneumomediastinum at dermatomyositis/polymyositis patients
Age/sex CK LDH Aldo. ANA Anti Jo-1 CV ILD agg. Treatment before PnM PM/DM, time to PnM Treatment after PnM Recovery
59/F 24 142 18.4 (+)∗ (–) (–) (+) PDS DM, initial. Steroid pulse, CsA 5 month
51/F 32 305 5.4 (–) (– (–) (+) PDS, CsA, HCQ DM, 1 month Steroid pulse, CsA, O2 2 month
42/F 166 267 37.6 (+) (– (–) (+) PDS, CsA, HCQ DM, 2 years Steroid pulse, CsA, O2 2 weeks
43/F 125 448 12.9 (–) (–) (–) (+) PDS, CsA DM, 6 month IVIG, PDS, CsA, HCQ, O2, 5 month
44/F 49 251 3.7 (+) (–) (–) (+) PDS, AZA PM, initial. PDS, CsA, O2, Collar 2 month
recur 290 346 7.1 (+) PDS, CsA DM, 1 week incision Unaltered, O2 1 month
54/F 26 122 7.1 (–) (–) (–) (+) PDS, CsA DM, 1 year IVIG, O2, PDS, Tacrolimus 2 weeks

Aldo.: aldolase, CV: cutaneous vasculopathy, agg.: aggravation, PDS: prednisolone, CsA: cyclosporine A, HCQ: hydroxycloroquinolone, AZA: azathioprine, IVIG: intravascular immunoglobulin. ∗Speckled pattern 1 : 640, Cytoplasmic pattern 1 : 320, Cytoplasmic patthern 1 : 160

Comparison of clinical features between Interstitial lung disease patients with and without pneumomediastinum
Pneumomediastinum (+) Pneumomediastium (–)
Numbers of patients 6 (7.1%) 77 (92.9%)
Age 48.8 (42~59) 45.4 (27~75)
Male/Female 0/6 14/63
DM/PM 6/0 63/14
Follow up duration (months) 22 (2~57) 30.3 (1~155)
ANA (+) 3 (50%) 47 (61.0%)
CK/LDH (mean) 101.7/268.7 596.4/358.3
Review of reported spontaneous pneumomediastinum cases with dermatomyositis/polymyositis in Korean
Ref. Age/Sex CK Aldolase Anti Jo-1 CV ILD agg. Treatment before PnM PM/DM, time to PnM Treatment after PnM Recovery
11 40/F 1,521 22.6 (–) (+) (+) PDS, IVIG DM, 3 weeks Steroid IV, CsA, O2 3 weeks
25 45/F NL ? (–) (+) (+) PDS, AZA, CPM DM, 2 months Unaltered 3 month
26 38/F 131 13.2 (–) (+) (+) PDS, HCQ DM, 4 months Unaltered, O2 1 month
27 18/M 4.6 13.8 (–) (–) (+) PDS, HCQ, IVIG DM, 1 months PDS, CPM, O2, thoracostomy Expire (2 m.)
28 56/F 1,405 ? (–) (–) (+) PDS DM, 2 weeks PDS, O2 Expire (1 m.)
29 53/F 20 ? (–) (–) (+) PDS, AZA DM, ? Unaltered, O2 ?
29 41/F 38 ? (–) (–) (+) PDS DM, 1 month PDS, AZA, O2 2 weeks
30 36/F 73 ? (–) (+) (+) PDS, MTX, HCQ DM, 4 months PDS, HCQ, MTX, IVIG, O2 Expire (1 m.)
30 45/F 156 ? (–) (+) (+) PDS, HCQ DM, 11 months Steroid IV, CsA IV, O2 Expire (1 m.)

Ref.: reference, CV: cutaneous vasculopathy, agg.: aggravation, NL: normal, ?: unknown, PDS: prednisolone, CsA: cyclosporine A, HCQ: hydroxycloroquinolone, AZA: azathioprine, IVIG: intravascular immunoglobulin, M: month

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