Herin R A, Hall P, Fitch J W
Am J Vet Res. 1978 Jun;39(6):989-91.
Thirty-four dogs were euthanatized in a chamber flushed with pure nitrogen. Electroencephalograms and arterial blood pressure, recorded during euthanasia, showed the dogs to be unconscious in an average time of 40 s and to be dead in 204 s. The dogs displayed no detectable signs of pain before unconsciousness occurred. Hypoxia produced by nitrogen inhalation was found to be effective, humane, safe, and economically feasible as a method of euthanasia.
34只狗在充满纯氮的舱室内实施安乐死。安乐死过程中记录的脑电图和动脉血压显示，这些狗平均在40秒内失去意识，204秒内死亡。在失去意识之前，这些狗没有表现出可检测到的疼痛迹象。吸入氮气产生的缺氧被发现是一种有效、人道、安全且经济可行的安乐死方法。
