[Permeability of the blood-brain barrier to intra-arterial formaldehyde]

Formaldehyde concentration was assessed in the brain, cerebrospinal liquor, arterial and venous blood of intact animals and following its intraarterial injections. It is concluded that formaldehyde is capable of penetrating through the blood-brain barrier, with the degree of permeability depending on blood formaldehyde concentration. The distribution of formaldehyde in the blood-brain-cerebrospinal liquor system suggests the presence of both protein-bound and unbound formaldehyde forms in the organism.