Healthcare and Medicine Reference
In-Depth Information
Valve
Airway
connector
Airway tube
Figure 14.4 Pro-seal LMA.
Cuff
Figure 14.2 A 'standard' LMA.
Table 14.1
LMA size
Type
Weight
Infl ation volume
3
Small adult
30-50 kg
20 mL
4
Normal adult
50-70 kg
30 mL
5
Large adult
70 kg+
40 mL
Figure 14.5 I-gel Supraglottic Device.
Sizing
A guide to choosing the correct size of LMA can be found in
Table 14.1.
Step-by-step guide: laryngeal mask airway
Preoxygenate the patient using the bag-valve-mask technique
Figure 14.3 Intubating LMA.
1
described in Chapter 13 (Figure 14.6a).
Defl ate or partly defl ate the cuff of the LMA and apply a water-
2
Intubating LMA (iLMA ® ) —A modifi cation of the original
LMA through which an endotracheal tube can be passed blindly
(Figure 14.3). For use in diffi cult airways.
soluble lubricant to the posterior surface of the cuff.
Hold the LMA like a pencil in your dominant hand, with the
3
index fi nger placed at the junction of the cuff and the tube.
Place your non-dominant hand on the back of the patient's
4
Pro-seal LMA ®—A drain tube provides direct access to drain
stomach contents; this reduces the incidence of aspiration
(Figure 14.4).
head. Extend the head (unless cervical spine instability is sus-
pected or known) and fl ex the neck (Figure 14.6b).
Press the tip of the cuff up against the hard palate and fl atten
5
the cuff against it (it helps to rotate the cuff slightly laterally at
this point).
Use your index fi nger to guide the cuff down towards your
I-gel ® Supraglottic Airway This variant does not have a cuff that
requires infl ation. It also incorporates a gastric channel and an
integral bite block to reduce the possibility of airway occlusion
(Figure 14.5).
6
non-dominant hand (Figure 14.6c).
 
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