TMC Style Question and Explanation 4

A patient complains that they have trouble breathing when they lay flat, the doctor orders a chest x ray and asks what further testing you would recommend.  

  1.  BNP
  2.  Pulmonary Function Test
  3. Polysomnography 
  4. ABG

This question is seeing if you understand orthopnea. Orthopnea is when you lay flat and have difficulty breathing, it is caused by CHF.  The only test that relates to CHF is a BNP so that is the correct answer.  It is trying to throw you off by offering test that are associated with pulmonary disease, if you didn’t know what orthopnea was you would probably guess one of those options.
As a reminder when you are studying a condition you need to memorize what tests are used to diagnose it, how it is treated and any other names it might be known as. In this example the scenario could be”A doctor thinks his patient might have orthopnea, he has ordered a chest x ray but would like to know what other tests you recommend?”

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