Open AccessComparison of serum amyloid A and C‐reactive protein as indicators of lung inflammation in corticosteroid treated and non‐corticosteroid treated cystic fibrosis patients
Author(s) -
Smith James W.,
Colombo John L.,
McDonald Thomas L.
Publication year - 1992
Publication title -
journal of clinical laboratory analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 50
eISSN - 1098-2825
pISSN - 0887-8013
DOI - 10.1002/jcla.1860060410
Subject(s) - medicine , serum amyloid a , c reactive protein , cystic fibrosis , gastroenterology , corticosteroid , inflammation
Serum amyloid A (SAA) and C‐reactive protein (CRP) levels were compared in 830 serum samples from 155 cystic fibrosis (CF) patients. Correlation coefficients were calculated for all samples (r=0.73), for samples from non‐corticosteroid treated (CFNS) patients (n=698, r=0.80), and for samples from corticosteroid treated (CFS) patients (n=132, r=0.35). SAA was the more sensitive indicator of pulmonary inflammation when SAA and CRP were compared to pulmonary function tests of 49 hospitalized patients at admission and discharge. CRP levels were significantly (p<.05) lower at admission in CFS patients than in CFNS patients, whereas SAA levels were not significantly different between the two groups. All nine CFS patients hospitalized had elevated SAA levels (average 22 times above normal limits) at admission, while only six had elevated CRP levels (average 3.7 times above normal limits) at admission. In the 40 CFNS patients both SAA and CRP levels were significantly elevated at admission. In each case SAA and CRP levels declined as pulmonary functions improved with effective antimicrobial therapy. In three instances SAA levels increased during hospitalization while CRP levels did not. In each case, rising SAA levels indicated clinical deterioration associated with evolving resistance of P. aeruginosa which required a change in antibiotic therapy. © 1992 Wiley‐Liss, Inc.