A 45-year-old male patient with known pulmonary hypertension is being airlifted from a rural hospital to a tertiary care center for advanced management. During the flight, the patient begins to exhibit signs of worsening shortness of breath, chest pain, and lightheadedness. What is the most appropriate immediate action to take?
Administer oxygen and ensure adequate oxygenation
Initiate invasive mechanical ventilation
Administer vasopressors to maintain blood pressure
Administer intravenous diuretics to reduce fluid overload