Chapter 3 - Entonox

Question 1

Presentation?

Answer 1

Combined nitrous oxide (50%) and oxygen (50%). Stored in medical cylinders that have a blue body and white shoulders.

Question 2

Indications?

Answer 2

Moderate to severe pain.

Labour pains.

Question 3

Actions?

Answer 3

Inhaled analgesic agent.

Question 4

Contraindications?

Answer 4

Severe head injuries with impaired consciousness.
Deep sea diving in the last 24hrs.
Disturbed psychiatric patients.
Intra-ocular injection of gas in the last 4 weeks.
Abdominal pain where intestinal obstruction is suspected.

Question 5

Cautions?

Answer 5

Patient at risk of pneumothorax

Question 6

Dosage and administration?

Answer 6

Administered via a face mask or mouthpiece.
Takes about 3-5 minutes to become effective.
5-10 minutes for maximum effect to be achieved.