“…In regard to LES parameters, LES length was analyzed in 5 studies, 11,15,19,21,23 3 of which 15,21,23 found a greater LES length in the supine position. Six 15,20,21,23,24,26 of 8 studies 11,12,15,20,21,23,24,26 showed a significant increase in LES basal pressure in the supine position, 3 studies [11][12][13] did not find differences, and one 19 found a significantly higher pressure in the upright position. IRP was significantly higher in the supine position in 10 of 13 studies, [14][15][16][17][20][21][22][23][24]26 while in 2 studies 13,18 it was significantly increased in the upright position.…”