Influence of Head and Neck Position on Oropharyngeal Leak Pressure and Cuff Position with the ProSeal Laryngeal Mask Airway and the I-Gel: A Randomized Clinical Trial

Table 2

Oropharyngeal leak pressures and ventilation with ProSeal LMA

Parameter	Neutral	Flexion	Extension	Lateral rotation
Oropharyngeal leak pressures (cm H2O)	28 ± 4.19	32 ± 4.11^*	24 ± 4.00^#	28 ± 3.15
Ventilation score (3/2/1/0)	30/0/0/0	29/0/0/1	30/0/0/0	30/0/0/0
Peak airway pressures (cm H2O)	16 ± 2.52	19 ± 6.09	15 ± 2.85^®	16 ± 2.59
Expiratory tidal volume (mL)	461 ± 68.72	452 ± 100.75	457 ± 66	463 ± 66.26
LAW-PAW	11 ± 5.02	12 ± 6.83	9 ± 5.18^¥	12 ± 4.27
EtCO2 (mm Hg)	31 ± 2.33	31 ± 1.98	31 ± 2.24	31 ± 2.06

Data shown are mean ± SD or numbers. value is in comparison with the neutral position.
^* < 0.001 between neutral and flexion, ^# < 0.001 between neutral and extension.
= 0.02 between neutral and flexion, ^® = 0.04 between neutral and extension.
^¥ < 0.001 between neutral and extension.