A total of the 16 cases of rheumatic vavular heart desease were examined in order to compare fibrillatriy F wave with left atrial size and biopsy findings from October 1986 to April 1987 at the Ewha Womans University Hospital. The results were as follows : 1) Of the 16 patients, there were 5 males and 11 females. The mean age of the patients was 41.9+/-12.7 years old. 2) Among the 16 patients PTF-V1 was lesser than -0.04nn-sec, the left atrial size measured by M-mode echocardiography was 57.1+/-8.9mm. Inverse correlation between PTF-V1 and the left atrial size measured by M-mode echocardiography was observed(P<0.01). 3) No significant correlation between PTF-V1 and left atrial was found(P>0.01). 4) There was a tendency that the size of the left atrium was, the more degeneration, necrosis and fibrosis of the left atrial wall appeared through pathological findings.