|   | 
        Without chest    compression (successful/total attempts) | 
        With chest    compression (successful/total attempts) | 
        P-value | 
       
      
        | ProSeal-N | 
        19/20 | 
        14/20 | 
        P<0.05 | 
       
      
        | ProSeal-90D | 
        20/20 | 
        19/20 | 
        N.S. | 
       
     
    ProSeal-N, conventional ProSeal™; ProSeal-90D, ProSeal™ bent 90 degrees by intubating stylet |