Hb Barts is composed of:
a. a4
b. g4
c. b4
d. z4
ANS: B
Hb Barts is composed of four gamma (g) chains. It is present at birth in all forms of a-thalassemia, even the silent carrier state (one gene deletion).
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Which of the following statements regarding violence against EMS personnel is TRUE?
A) There are always indications of the potential for impending violence on EMS calls. B) EMS personnel are at greater risk of injury from motor vehicle trauma than from violence. C) There has never been a reported case of violence against EMS personnel in rural areas or towns with a population of 5,000 or less. D) Most violence against EMS personnel involves the use of firearms.
The respiratory therapist is using a bag-valve-mask resuscitator to ventilate an adult patient. The tidal volume and inspiratory time produce an inspiratory flow of 60 L/minute. What should the therapist do at this time?
A. Continue providing this level of ventilation. B. The therapist needs to increase either the Vt or the Ti to deliver a flow greater than 60 L/minute. C. The inspiratory flow needs to be reduced to 40 L/minute or less. D. The therapist needs to alternate squeezing the bag gently and vigorously to fluctuate the flow.