oxygen

Question 1

Classification

O2

Answer 1

Naturally occuring atmospheric gas

Question 2

INDICATIONs

O2

Answer 2

• Prevent/treat hypoxemia
• Acute ischemic chest pain
• Limits the size of myocardial infarction
• Resp distress
• Decreases hemoglobin/oxygen carrying capacity
• Treatment of prophylaxis for decrease in atmospheric pressure (decreases PO2) for air transport
• Depressed LOC (any cause)

Question 3

CONTRAINDICATIONs

O2

Answer 3

*NO absolute contraindications

Poisoning from the herbicide paraquat // diquat // pt w/ tx chemotherapy (e.g bleomycin) may result in serious pulmonary complications (eg, oxygen toxicity and pulmonary fibrosis)

*Use with caution in COPD - watch for signs of hypoventilation

Question 4

Pharmacodynamic

O2

Answer 4

• increases PO2
• reverses hypoxemia
• oxidizes glucose to produce ATP (energy source)

Question 5

Pharmacokinetics

O2

Answer 5

Onset - immediate
Peak - < 1 min
Half-life - unknown
Duration - 2 mins

Question 6

Dosage

O2

Answer 6

• High FiO2 for patients with signs and symptoms of cardiac or respiratory distress, failure or decreased O2 carrying capacity
• Consider lower FiO2 in the newborn and the head injured patient

Question 7

Warnings // Precautions

O2

Answer 7

• COPD w/ CO2 retention - NEVER withhold O2 from a patient in respiratory distress
• Neonates: prolonged exposure to high PO2 may cause blindness

Question 8

ADVERSE EFFECTs

O2

Answer 8

none with short term use

- secondary brain injury occurs largely as a result of oxygen-free radicals, hence the rationale for the current trend to limit FiO2 in the head injured patient