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Our aim is to clarify the factors for early diagnosis of cardiac sarcoidosis (CS) in patients with complete atrioventricular block (CAVB) and its impact on cardiac function after corticosteroid therapy.A total of 15 CS patients with CAVB who underwent corticosteroid therapy were retrospectively analyzed. Patients were divided into two groups according to the time from the first CAVB onset to the diagnosis of CS. Clinical characteristics and outcomes were compared between the early diagnosis group (within 1 year; group E, n = 10) and the late diagnosis group (over 1 year; group L, n = 5).The history of extracardiac sarcoidosis (60 versus 0%, P = 0.0440) and abnormal findings on echocardiography (70 versus 0%, P = 0.0256) at the CAVB onset were significantly more frequent in group E than in group L. The change of left ventricular ejection fraction (LVEF) and brain natriuretic peptide (BNP) levels was significantly better in group E than in group L (0.8 ± 2.8 versus -32.4 ± 3.9%, P &lt; 0.0001; -11.1 ± 16.0 versus 161.8 ± 35.8 pg/mL, P = 0.0013, respectively). After corticosteroid therapy, the LVEF and BNP levels were also significantly better in group E than in group L (53.3 ± 10.7 versus 37.0 ± 9.3%, P = 0.0128; 63.0 ± 46.4 versus 458.8 ± 352.0 pg/mL, P = 0.0027).The diagnosis may be delayed in CS patients with CAVB without history of extracardiac sarcoidosis. Abnormal findings on echocardiography contributed to the early diagnosis of CS. Therefore, the diagnosis of CS may be missed or delayed in patients without them. Time delay from the CAVB onset to the CS diagnosis may exacerbate the cardiac function.

Importance of Early Diagnosis of Cardiac Sarcoidosis in Patients with Complete Atrioventricular Block