Journal List > J Korean Med Assoc > v.51(10) > 1042085

Kang: Sarcoidosis in Korea: Revisited

Abstract

Sarcoidosis is a multisystem disorder of unknown origin characterized by noncaseating granulomatous inflammation. This disorder has variable clinical course, ranging from benign self-limited recovery to life-long disability. Sarcoidosis is found worldwide; however, the incidence and clinical course of the disease vary among different ethnicity and geographic regions. Especially in Korea, sarcoidosis had been known as a very rare disease until the 1st and the 2nd nationwide surveys performed in 1993 and 1998 by the Korean Academy of Tuberculosis and Respiratory Diseases. Those surveys revealed gradually increasing incidence of biopsy-proven sarcoidosis in Korea (0.027/100,000 in 1993 to 0.125/100,000 in 1998), but still very rare, and the peak age was the 30's with a female predominance (64.6%). The respiratory symptom was the most common (42%) symptom and thoracic lesion including mediastinum was the most frequently (87%) involved organ. On the other hand, cardiac involvement of this disease was very rare (0.7%). In conclusion, sarcoidosis in Korea, is a still uncommon disorder, and clinical manifestations were similar to those of western countries. Additional nationwide survey should be performed and maintained in order to investigate the correct incidence and the course of clinical manifestations of sarcoidosis in near future.

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Table 1.
Clinical evaluation in sarcoidosis (adapted from N Engl J Med 2007; 357: 2153–2165)
Initial Assessment
History and physical examination (attention to environmental or occupational exposure and family history)
Biopsy of affected organ, with special stains and culture of specimen
Posteroanterior and lateral chest radiographs
Pulmonary function tests – spirometry with bronchodilator, total lung capacity, and diffusion capacity
Electrocardiography
Complete ophthalmologic evaluation (slit – lamp, tonometric, and fundoscopic examinations)
Complete blood count with platelet count and measurement of serum calcium, creatine, alkaline phosphatase, alanine
aminotransferase, and aspartate aminotransferase levels)
Measurement of serum level of angiotensin – converting enzyme (if elevated, may be useful to monitor patient compliance)
Other tests as indicated for assessment of involved organs:
Heart – Holter monitoring, echocardiography, cardiac PET, MRI, and electrophysiological study for inducible arrhythmias
Lung – right-heart catheterization for pulmonary hypertension
Central nervous system – MRI with gadolinium and cerebrospinal fluid analysis
Monitoring (follow-up every 2 to 3 months)
Assessment for decline in physiological function based on initial organ involvement
Further testing in the case of new symptoms or physical findings
Testing to monitor side effects of therapy – for example, bone densitometry for corticosteroid use and semiannual ophthalmologic examination for hydroxychloroquine use
Table 2.
Comparison of frequency of organ Involvement between united states and Korea (adapted from *; AC-CESS study and ; 2nd national survey of sarcoidosis in Korea)
Site of Lesion Presentation, % in U.S*. Presentation, % in Korea
Lung 95 87.1
Skin 24 30.7
Eye 12 14.2
Extrathoracic lymph node 15 12.9
Liver 12  
Spleen 7  
Neurologic 5 1.3
Cardiac 2 0.7
Table 3.
Initial therapy according to organ and clinical status (adapted from N Engl J Med 2007; 357: 2153–2165)
Organ Clinical findings Treatment
Lung Dyspnea+FEV1, FVC < 70%
Cough, wheezing
Prednisone, 20∼40 mg/day
Inhaled corticosteroid
Eye Anterior uveitis
Posterior uveitis
Optic neuritis
Topical corticosteroid
Prednisone, 20∼40 mg/day
Prednisone, 20∼40 mg/day
Skin Lupus pernio
Plaques, nodules
Erythema nodosum
Prednisone, 20∼40 mg/day
Hydroxychloroquine, 400 mg/day
Thalidomide, 100∼150 mg/day
Methotrexate, 10∼15 mg/day
Prednisone, 20∼40 mg/day
Hydroxychloroquine, 400 mg/day
NSAIDs
Central nervous system Cranial nerve palsy
Intracerebral involvement
Prednisone, 20∼40 mg/day
Prednisone, 20∼40 mg/day
Azathioprine, 150 mg/day
Hydroxychloroquine, 400 mg/day
Heart Complete heart block
Ventricular fibrillation, tachycardia
Decreased LVEF (< 35%)
Pacemaker
AICD
AICD; Prednisone, 30∼40 mg/day
Liver Cholestatic hepatitis with constitutional symptoms Prednisone, 20∼40 mg/day
Ursodiol, 15 mg/kg/day
Joint and muscle Arthralgias
Granulomatous arthritis
Myositis, myopathy
NSAIDs
Prednisone, 20∼40 mg/day
Prednisone, 20∼40 mg/day
Hypercalciuria hypercalcemia Kidney stones, fatigue Prednisone, 20∼40 mg/day
Hydroxychloroquine, 400 mg/day
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