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 Best of Five 147

 

   

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BOF: 147

A patient, who is known to have COPD and has severe arterial hypoxaemia, is shown to have profound nocturnal hypoxaemia. In this patient which of the following statements is false?

a)      Alveolar hypoventilation occurs due to an increase in upper airway resistance due to a reduction in muscle tone during sleep

b)      Shallow breathing in REM sleep reduces alveolar ventilation

c)      Inhibition of intercostal and accessory muscles in REM sleep reduces alveolar ventilation

d)      Increased pulmonary artery pressure is caused by increased venous return to the right heart during deep sleep

e)      Severe secondary polycythaemia occurs partly as a result of nocturnal hypoxaemia

 

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