Table 2.

Total immunoglobulin (Ig) subclass levels and their ratios in plasma and pericardial fluid (PF) of cardiac surgery patients

Ig isotype	Plasma mean ± s.e.m.	Pericardial fluid mean ± s.e.m.	PF : plasma ratio	% Plasma level
IgA (g/l)	0·41 ± 0·13	0·07 ± 0·02	1 : 6	16·6%
IgG1 (g/l)	1·62 ± 0·48	0·31 ± ·10	1 : 5	18·9%
IgG2 (g/l)	4·89 ± 1·34	0·59 ± 0·18	1 : 8	12·5%
IgG3 (g/l)	0·13 ±  ,05	0·02 ± 0·01	1 : 8	12·5%
IgG4 (g/l)	0·15 ± 0·07	0·04 ± 0·02	1 : 4	23·8%
IgM (g/l)	0·12 ± 0·07	0·014 ± 0·01	1 : 8	12·5%

s.e.m. = standard error of the mean.