Nitrous oxide: a global toxicological effect to consider.

able nerve stimulator in a pilot study carried out in a porcine model. The true value of this study lies in the detection of impedance changes that signify intraneural needle placement. Depending on the species, the noted change in impedance may be an increase or a decrease, and it may even be transient in nature. As it is said in a famous Chinese proverb attributed to Deng Xiaoping for his pragmatic policies, “It doesn’t matter if a cat is black or white; as long as it can catch mice, it’s a good cat.”