A 25 year old female, a known case of sickle cell anemia is presented with bony pain, dyspnea, fever & cough. O/E: her HR is 110/min & BP is 140/88 mmHg, SaO2 is 85%. CXR shows bilateral diffuse alveolar infiltrates. Her mother gives history of four similar episodes in the last one year. All of the statements regarding her condition are true EXCEPT: