Which gas can cause expansion of the middle ear and therefore is contraindicated in tympanic graft cases?

What is suggested by an inverted cone burn pattern on a wall?

a. slow rate of spread b. flashover/flameover c. ignitable liquid poured along the base of the wall d. strong updraft due to structural alterations

When considering spinal immobilization of an infant who fell, it is important for the AEMT to remember that:

A. infants and small children often land head first because their head accounts for 25% of their body weight. B. It is common for infants to land feet first when they fall, resulting in compression fractures of the spine. C. the anterior fontanelles typically does not fuse until the child has reached the age of 18 to 24 months.