What are the three categories of methods for protecting oral health care personnel from radiation exposure?
What will be an ideal response?
Time, distance, and shielding are methods of protecting the operator from radiation exposure. Attention to detail diminishes the need for retakes, so the operator spends less time near the x-ray machine. Structural shielding is generally sufficient, but if there is no barrier available, the operator should stand a minimum of 6 feet from the patient's head.
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A patient with COPD should present with a PO2 of:
A) 35-45 mmHg. B) 70-80 mmHg. C) 50-60 mmHg. D) 94-96 mmHg.
Which of the following is true of the oxygen dissociation curve?
a. The normal partial pressure of oxygen (PO2) at which hemoglobin is 50% saturated is 20 mm Hg. b. A shift to the right or left in response to blood pH is called the Bohr effect. c. A shift to the left results in lower oxygen affinity. d. A shift to the right results in less effective delivery of oxygen to tissue.