| Summary: | The first attempt insertion success rate of Laryngeal Mask Airway (LMA)
Classic is low and varies. Various techniques or modifications of LMA insertion
are used to increase the first-attempt insertion success rate and reduce the
complication. One of these modification uses rigid stylet. With this technique,
the lack of the standar technique is expected to be resolved, LMA becoming more
rigid, the angle of LMA becoming more appropriate with the airway anatomy, and
no need for exaggerate mouth opening , so hopefully it could increase its
successful rate. This study aimed to test the hypothesis that the first attempt
success rate of LMA Classic insertion is higher in modified technique with rigid
stylet than standard technique.
A prospective, randomized open trial study was performed in 88 healthy
patients (ASA I or II) undergoing general anesthesia. Patients were randomly
allocated into one of two groups to receive modified technique with rigid stylet as
group R, with 44 patients and standard technique as group S, with 44 patients.
The first attempt success rate was compared between the groups. The time to
insertion, complications such as sore throat and the presence of blood on the
removed masks is being investigated. The nominal data was analyzed with
unpaired T-Test and Chi-square test was used to analyze numerical data and
p<0.05 was considered as significant.
Demographic data such as age, sex, BMI, ASA class, and malampati,
demonstrate no significantly statistical difference between the two groups. The
first attempt success rate is defined as a succesfull insertion of Classic LMA to
maintain airway patency, and effective ventilation in the first attempt. First
attempt success rate was higher in modified technic with rigid stylet (93 %) than
standard in technique (83.7%) (p>0.05) which the difference was not meaningful .
The time to insertion was significantly faster with rigid stylet technique (7,12 ±
3,53) than standar technique (15,52 ± 4,94 seconds) (p<0.05). Conclusion: The
first attempt insertion success rate with modified technic with rigid stylet (93 %)
was higher than standard technique (83,7%) and there was no significantly
statistical difference between the two groups (p>0.05).
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