Mapleson Classification: Structure

Question 1

Describe Mapleson A

order of parts, length of tubing and purpose of reservoir bag

Answer 1

Also known as Magills
Order: F, R, A, Pt (FRAP)

Length of tubing 110cm
Reservoir bag is used to monitor patients respiration, ventilating and protects patient from excessive pressures.

Question 2

How is Mapleson A tested for leaks?

Answer 2

By occluding the patient end, closing the APL valve and pressuring the system.

Question 3

Mapleson B & C component orders?

What is the difference between B & C?

Answer 3

R, F, A, P

Mapleson B has a corrugated tube. Can be used for emergency resuscitation, high flow of gases is needed to prevent rebreathing, and theatre pollution is Max.

Question 4

Mapleson D, E, F circuit: what differentiates them?

Answer 4

They have FGF closest to the patient.

D - R, A, F, P

E doesn’t have an APL valve or reservoir bag.

Question 5

What is a Bains circuit?

Answer 5

A modification of Mapleson D, with coaxial circuit where FGF is supplied to patient through the inner tube and expiratory flows out to APL and RB through outer corrugated tubing.

Question 6

What is the diameter of the inner and outer tubing of Bains circuit?

What is the length of a Bains circuit?

Answer 6

Outer diameter - 22mm

Inner tubing - 7mm

Length - 1.8 meters