Table 2.

Simulated pressure drop in Pa between nostrils and nasopharynx of the nasal cavity with total flow rate of 600 ml/s through both nostrils

	Patient 1 $\mathrm{\Delta }p$ [Pa]	Patient 2 $\mathrm{\Delta }p$ [Pa]	Patient 3 $\mathrm{\Delta }p$ [Pa]	Patient 4 $\mathrm{\Delta }p$ [Pa]	Patient 5 $\mathrm{\Delta }p$ [Pa]
Pre	−67	−41	−69	−40	−163
Virtual	−27	−22	−30	−25	−34
Post	−35	−30	−90	−21	−36
$\mathrm{\Delta }\mathrm{\Pi }$	1.25	1.72	1.85	0.78	1.02

Pre pre-operatively; post postoperatively; virtual simulated. $\mathrm{\Delta }\mathrm{\Pi }$ is defined in the text