What is the term for the fail-safe mechanism that allows a lower pacemaker to take over when a higher site fails?

Exposure of a Clark electrode to gaseous anesthetic agents such as nitrous oxide will cause which of the following to occur?

a. The pH will increase. b. The electrode will function normally. c. There will be an increase in the production of peroxide ions. d. The carbon dioxide in the blood will in-crease and cause an erroneous reading.

In the acronym SAMPLE, the L stands for:

A. longstanding allergies. B. latent pulse rate. C. last oral intake. D. list of medications.