Spontaneous recanalization of chronic internal carotid artery occlusions: report of 3 cases.

Spontaneous recanalization of a chronically occluded internal carotid artery (ICA) is a rare occurrence. The authors report 3 patients who had documented total occlusion of the ICA followed by late spontaneous recanalization with subsequent high-grade stenosis. The patients in this series had occlusions for 11 months, 36 months, and 39 months, respectively.

[Electromyographic characteristics of acute poisonings with chlorine derivatives of phenoxy acids].

In acute poisonings with chlorine derivatives of phenoxy acids, the myotonic period of poisoning is marked electromyographically by the manifestations specific and non-specific for myotonia. The characteristic signs involve multiple electrical responses of muscle fibers stimulated by a single excitation impulse--potential or myotonic discharges. Non-specific alterations are characterized by prolongation of the latent period, decreased amplitude and shortening of the length of evoked action potentials, which indicates the suppression of muscle excitability.

[Effect of phenobarbital on the embryotoxic action of 2-methyl-4-chlorophenoxyacetic acid].

Single administration of 2-methyl-4-chlorophenoxyacetic acid (2M-4C) to albino rats on the 9th and 10th day of gestation produces a teratogenic and embryotoxic action. A preliminary administration of phenobarbital in a dose of 80 mg/kg for 3 days largely reduced the embryotoxic effect of the drug, this manifesting itself in a lower general embryonal and post-implantation mortality, greater size and mass of the fetuses. It is suggested that the stimulation of the microsomal oxidation with phenobarbital led to a higher speed of the 2M-4C molecule decomposition and, consequently, to its lessened embryotoxic effect.

[Chloroderivatives of phenoxyacetic acid as antagonists of thyroid hormones].

A 24-hour stay of the Rana temporaria tadpoles in solutions of the sodium and diethylamine salts of 2,4-dichlorophenoxyacitic acid (with 1 and 2 mg/l, respectively) significantly inhibits their metamorphosis. An addition of these salts to a solution containing thyroidin in a concentration of 1--5 mg/l hinders the action of hormone stimulating metamorphosis. The effect of the sodium salt of 2,4-dichlorophenoxyacetic acid prevents the destruction of some tadpoles by toxic concentrations of thyroidin.