CRP and connective tissue disorder: After the emergency, results of laboratory assessments included normal levels of electrolytes, blood lipid and glucose, the C-reactive protein (CRP) level was 2.27 mg/L (0-3 mg/L) and erythrocyte sedimentation rate (ESR) was 20 mm/h (0–15 mm/h), NT-proBNP was 670 pg/ml, nucleic acid testing was negative, both inflammatory marker and rheumatoid factors were normal, ANA and other autoimmune markers were negative ruling out active connective tissue disease.