Abbreviations:
ICU = Intensive Care Unit, IPD = Indoor Patient Department,
SpO2 = Peripheral capillary oxygen saturation, HFNC =
High flow nasal cannula, FiO2 = fraction of inspired
oxygen, HRCT = High-resolution computed tomography, ARDS = acute
respiratory distress syndrome, DGHS = Directorate General of Health
Services, NRBM = non-rebreather mask, BP = Blood Pressure, mmHg =
millimetres of mercury, RR = Respiratory rate, NIV = Non-invasive
ventilation, ABG = Arterial blood gas, CSS = Churg-Strauss syndrome, LDH
= Lactate dehydrogenase, INR = International normalized ratio, ECG =
Electrocardiogram, CRP = C-reactive protein, RBS = Random blood sugar,
ESR = Erythrocyte sedimentation rate, BNP = brain natriuretic peptide.