Treatise on Poisons by Sir Robert Christison

abruptly_. The individual is suddenly observed to cry out, often to vomit, and instantly falls down in convulsions. The effects of the narcotic poisons, if we except some cases of poisoning with hydrocyanic acid, the narcotic gases, and a few rare alkaloids, never begin otherwise than gradually, though their progress towards their extreme of violence is often rapid. This distinction is generally an excellent one. But it will not apply so well to some cases of epilepsy in which the convulsions are trivial. Esquirol says an epileptic fit may consist of nothing more than coma, with convulsive movements of the eyes, or lips, or chest, or a single finger.[1647] Still even then the coma generally begins abruptly, so that if the case is seen from the beginning, it can hardly be mistaken for narcotic poisoning. Some forms of epilepsy, in which the fit is constituted merely by giddiness, staring, wandering of the mind, and imperfect loss of recollection,[1648] might be confounded with the milder forms of narcotic poisoning. But collateral circumstances will scarcely ever be wanting to distinguish such cases from one another. The varieties of narcotic poisoning which, in the violence and abruptness of their commencement, bear the closest resemblance to an epileptic attack, are some cases of poisoning with hydrocyanic acid or with the deleterious gases. Both of these varieties, however, when they begin so abruptly, are distinguished from a fatal paroxysm of epilepsy by the fourth characteristic to be mentioned presently; and besides, in abrupt cases of poisoning with hydrocyanic acid, the poison under certain conditions will be found in the body; while in sudden poisoning with the narcotic gases, the nature of the accident is rendered obvious to a cautious inquirer by the collateral circumstances.