EMERGENCY TREATMENT OR OPERATION
[Ordinarily a physician or surgeon must obtain the consent of a patient before operation on or treating him. However,] If in an emergency, as defined in these instructions, it is impossible or impracticable to obtain consent, either form the patient or someone legally authorized to consent for him, a physician or surgeon may undertake surgery or other treatment provided that what he does is within the customary practice of physicians or surgeons of good standing [in the same or a similar locality and] under similar circumstances.
NEV. J.I. 6.14