LMA

Question 1

Dr. Brain developed what?

Answer 1

the LMA

Question 2

advantages of LMA

Answer 2

1. Less stimulating during use (cf ETT)
2. Does not require neuromuscular blockade for placement or maintenance (cf ETT)
3. Less ↑ in intrathoracic and intraabdominal pressures during
4. emergence (cf ETT)
5. Less cardiovascular response (cf ETT)
6. Less ↑ in IOP (cf ETT)
7. Frees practitioner’s hands (cf face mask)
8. Provides post-op airway (cf OAW, NAW)

Question 3

Disadvantages of LMA

Answer 3

1. Learning curve
2. Over-estimated ease of use

Question 4

LMA function = it
establishes
airway with
_____ seal

Answer 4

supraglottic

Question 5

In an LMA, there is _____ between
airway tube and
body of mask

Answer 5

≈ 30^o

Question 6

what the size of the LMA connector?

Answer 6

15 mm connector

Question 7

how much air goes in a size 4 LMA

Answer 7

30 mL of air

(Size - 1 , then add a 0)

i.e. size 5 = 40 mL of air

Question 8

what pharynx does the cuff of the LMA sit when correctly inserted?

Answer 8

hypopharynx (a.k.a. larnygopharynx)

Question 9

where should tape an LMA

Answer 9

zygomatic region

Question 10

Which oral structure might you see edema in due to the LMA?

Question 11

which laryngeal joint can be dislocated due to LMA

Answer 11

Cricoarytenoid joint dislocation

Question 12

LMA insertion can stimulation which cranial nerves?

Answer 12

CN IX

CN X

Question 13

Indications for LMA

Answer 13

1. Administration of general anesthesia
2. Establish airway emergently for PPV
3. Facilitate endotracheal intubation
4. Adjunct to FFOB airway management
5. Recovery from high-risk surgical procedures

Question 14

contraindications of LMA

Answer 14

1. Risks of aspiration (GERD, not NPO, hiatal hernia, obesity, pregnancy, bowel obstruction, acute pancreatitis, ….)
2. Respiratory disease with low compliance and/or high resistance.
3. Patient position or surgery limiting airway access.
4. upper airway pathology (infection, hematoma, cyst, ….)

Question 15

LMA Sizing

Answer 15

3 = 30-50kg

4 = 50-70 kg

5 = 70-100kg

Question 16

What is the purpose of a fastrach LMA?

Answer 16

It allows blind intubation without moving the head and neck