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CLINICAL INVESTIGATION
Year : 2008  |  Volume : 52  |  Issue : 2  |  Page : 170-174

Comparison of Clinical Performance of the LMA Classic with Disposable Soft Seal LMA in Spontaneously Breathing Patients for Elective Surgical Procedures


1 Associate Professor, Dept.of Anaesthesiology, B.S. Medical College, Bankura, West Bengal, India
2 P.G.Student, Department of Surgery, N. R. S. Medical College, Kolkata, West Bengal, India
3 Associate Prof., Department of Surgery, N. R. S. Medical College, Kolkata, West Bengal, India

Correspondence Address:
Dipasri Bhattacharya
B-26/10, E.K.T.P. Phase IV, Abhyudoy Cooperative, P.O. E.K.T, Kolkata - 700107
India
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Source of Support: None, Conflict of Interest: None


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The laryngeal mask airway - LMA classic has been widely used in clinical practice. A new disposable supraglottic airway device, the soft seal LMA has been introduced recently. We have compared the LMA classic with the disposable soft seal LMA in terms of various clinical parameters. Two hundred patients aged 20-50 years, body weight 50 to 70 kg, ASA I and II were randomly assigned into two equal groups for airway management during surgery with size 4 LMA, Group A (n=100) for classic LMA and Group B (n=100) for disposable soft seal LMA. Anaesthesia was induced with fentanyl 2mcg.kg-1 + propofol 3mg.kg-1, maintained with nitrous oxide 66%, oxygen 33% and halothane 2 to 3%. The variables studied were ease of insertion and insertion time, cuff pressure changes during nitrous oxide anaesthesia, presence of blood on the LMA on withdrawal and postoperative sore throat at 2 and 24 hours. LMA classic and disposable LMA showed similar clinical performance as shown by their insertion time, successful insertion at first attempt achieved within 15 seconds in 98% of Group A and in 97% of Group B. LMA cuff pressure increased from 45.01 ± 8.0 mm of Hg to 68.40+ 10 mm of Hg in Group A and from 45.02 ± 2.0 to 48.10±6.0 mm of Hg in Group B (P<0.05). Macroscopic blood was seen on 8 occasions in Group A and never in Group B. Incidence of sore throat at 2 hours post operatively was 30% in Group A and 10% in Group B (P< 0.05). However, there was no such difference at 24 hours postoperatively. So LMA disposable soft seal is a useful alternative to LMA classic, there is less trauma and less incidence of sore throat in the postoperative period.


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