Summary and Conclusions
A technique is described for the examination of thin plasma clots with the electron
microscope, by which the clots of nine patients with classical hemophilia and five
normal controls were studied. The hemophiliacs’ plasma clots were strikingly different
from normal, with relatively straight, wide fibrin strands. This difference appeared
to be due to their long clotting times. It is proposed that this abnormal end-product
of fibrin polymerization in hemophilia, perhaps together with the decreased platelet
clumping which also was observed, may be a cause of the functional inadequacy of blood
clots in hemophilia.
Presented in part in abstract, Clinical Research 11: 190, 1963 and clinical Research
11: 293, 1963.