High tidal volumes and/or high levels of PEEP can cause which of the following?
a. Improvement in pulmonary blood flow
b. Increased right ventricular afterload
c. Interventricular septum shifts to the right
d. Increased myocardial perfusion
ANS: B
High tidal volumes and/or high levels of PEEP result in increased resistance to blood flow through the pulmonary circulation; this increases right ventricular afterload. In addition, the right ventricle becomes overdistended, causing a decrease in RV output. Dilation of the RV can also force the interventricular septum to move to the left. Left ventricular output may also be de-creased because of the expanding lungs. This plus the decreased venous return lowers cardiac output and decreases the amount of blood perfusing the myocardium.
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During a concentric contraction the insertion moves __________________ the origin
a. closer to b. away from c. Neither answer is correct.
A simple face mask running at 10 to 12 liters per minute will supply which of the following oxygen concentrations?
A) 60 to 90 percent B) 80 to 100 percent C) 40 to 50 percent D) 50 to 65 percent
Your patient is a young adult male in police custody after he crashed his car into a utility pole. There is minor front-end damage to the vehicle, and the air bags deployed. The patient was not wearing a seat belt and has an abrasion on his forehead. He is awake and oriented to person, time, and place. His speech is slurred and he has an odor of alcohol on his breath. The arresting officer states
that he just wants you to check the patient out before he transports him to jail. Which one of the following is most appropriate? A) Contact medical command. B) Have the patient sign a refusal-of-care form. C) Release the patient to the police. D) Have the officer sign a refusal-of-care form.
A bag-valve mask with a reservoir connected to a supplemental oxygen supply will deliver an oxygen concentration of:
A) 70% to 80%. B) 90% to 100%. C) 60% to 70%. D) 50% to 60%.