GEOLOGY

Detailed explanation-1: -Oxygenation index (OI=mean airway pressure MAP × FiO2 × 100÷PaO2) is used to assess severity of hypoxic respiratory failure (HRF) and persistent pulmonary hypertension of the newborn (PPHN). An indwelling arterial line or arterial punctures are necessary to obtain PaO2 for calculation of OI.

Detailed explanation-2: -OI < 5 – healthy person; OI 5-25 – indicates lung disease; OI 25-40 – increased mortality; and.

Detailed explanation-3: -An oxygen saturation index or OSI can be used (3, 4). Historically, an OI > 30 prompts the clinician to consider high-frequency ventilation. An OI > 40 has been associated with high mortality and is used as a criterion for ECMO consideration.

Detailed explanation-4: -It is also called critical oxygen index (COI) or Oxygen Index (OI) and it is defined as the minimum fraction of oxygen in a mixture of oxygen and nitrogen that will just support combustion (after ignition). The test is performed under standardised conditions, at 25 °C.