Objective:
The Supreme™ laryngeal mask airway (SLMA) is a supra glottic airway (SGA) device that is used as an alternative to endotracheal tubes. In the present study, we aimed to compare the use of the SLMA with normal cuff pressure and low cuff pressure, primarily for haemodynamic response.
Methods:
In the present study, 120 patients diagnosed with hypertension and scheduled for varicose vein or inguinal hernia operation were enrolled and 99 patients finished. Using randomization, patients were divided into two groups according to cuff pressure as a low-pressure group (Group L, 45 cm H2 O) and a normal-pressure group (Group N, 60 cm H2 O). Demographics, Mallampati score and the type and duration of surgery, heart rate (HR), mean arterial pressure (MAP), percentage of tidal volume leakage, Ppeak, Pmean, etCO2 , seal pressure, fibreoptic scores and postoperative adverse effects of all patients were recorded.
Results:
MAP and HR values immediately and 2 minutes after SLMA insertion were significantly lower in Group L (p<0.001). In Group L and Group N, the seal pressures were 24.1±3.1 cm H2 O and 26.2±3.9 cm H2 O, respectively (p=0.003). Also, blood staining and sore throat occurred less frequently in Group L (p<0.05). The fibreoptic average score, insertion features and ventilation parameters were similar between the groups (p>0.05).
Conclusion:
SLMA use with a cuff pressure of 45 cm H2 O significantly decreases haemodynamic response and post-operative side effects compared with a normal cuff pressure. Therefore, except for some specific surgeries that require higher seal pressures, we recommend the use of the SLMA with cuff pressures as low as 45 cm H2 O.
Keywords: Laryngeal mask airway supreme, general anaesthesia, haemodynamic response, cuff pressure, seal pressure