Table 1.

Conditions of patients requiring oxygen [23].

	Conditions of patients requiring oxygen
	Critical condition	Serious condition	Observation conditions
Initial oxygen administration (L/min)	Reservoir mask 15 L/min	Nasal cannula 2–6 L/min or simple face mask 5–10 L/min	Nasal cannula 2–6 L/min or simple face mask 5–10 L/min
Oxygen targets	94–98%	94–98%	94–98%
Examples	Heart attack Poisoning Carbon monoxide Severe head injury Shock Sepsis Drowning Anaphylaxis Lung bleeding Status epilepticus	Acute hypoxemia acute asthma Pneumonia Lung cancer Pneumothorax Pleural effusion Pulmonary embolism Acute heart failure Severe anemia	Stroke Myocardial infarction Acute coronary syndrome Drug overdose Bleomycin addiction Metabolic and renal disorders Nervous system disorders Emergency conditions in pregnancy