Effect of different types of laryngeal mask airway placement on the right internal jugular vein: A prospective randomized controlled trial

Table 4 Cross-sectional area and blood flow velocity of the internal jugular vein

	Group 1, n = 30	Group 2, n = 39	Group 3, n = 29	P value1
Cross sectional area in cm2
Before LMA2	1.42 ± 0.48	1.66 ± 0.68	1.54 ± 0.66	0.350
After LMA	1.62 ± 0.56	1.82 ± 0.77	1.66 ± 0.65
Flow velocity in cm/s
Before LMA3	31.25 ± 7.37	28.37 ± 8.49	31.82 ± 12.55	0.511
After LMA	24.07 ± 8.99	24.65 ± 8.55	26.45 ± 10.55

¹Compared between groups;

²Before LMA vs After LMA: P = 0.001;

³Before LMA vs After LMA: P = 0.000. Results are presented as the mean ± SD. LMA: Laryngeal mask airway.