No. | VTI Test | Parameters Abbreviation | Units | Parameter Description | Parameter Interpretation | Parameter Class | Targeting/Contributing Pelvic Structures |
1 | 1 | Fmax | N | Maximum value of force measured during the VTI probe insertion [9] | Maximum resistance of anterior vs posterior widening; tissue elasticity at specified location (capability to resist to applied deformation) | Maximum vaginal tissue elasticity at specified location | Tissues behind the anterior and posterior vaginal walls at 3 - 15 mm depth |
2 | 1 | Work | mJ | Work completed during the probe insertion (Work = Force × Displacement) [9] | Integral resistance of vaginal tissue (anterior and posterior) along the probe insertion | Average vaginal tissue elasticity | Tissues behind the anterior and posterior vaginal walls at 3 - 15 mm depth |
3 | 1 | Gmax_a | kPa/mm | Maximum value of anterior gradient (change of pressure per anterior wall displacement in orthogonal direction to the vaginal channel) | Maximum value of tissue elasticity in anterior compartment behind the vaginal at specified location | Maximum value of anterior tissue elasticity | Tissues/structures in anterior compartment at 10 - 15 mm depth |
4 | 1 | Gmax_p | kPa/mm | Maximum value of posterior gradient (change of pressure per posterior wall displacement in orthogonal direction to the vaginal channel) | Maximum value of tissue elasticity in posterior compartment behind the vaginal at specified location | Maximum value of posterior tissue elasticity | Tissues/structures in anterior compartment at 10 - 15 mm depth |
5 | 1 | Pmax_a | kPa | Maximum value of pressure per anterior wall along the vagina | Maximum resistance of anterior tissue to vaginal wall deformation | Anterior tissue elasticity | Tissues/structures in anterior compartment |
6 | 1 | Pmax_p | kPa | Maximum value of pressure per posterior wall along the vagina | Maximum resistance of posterior tissue to vaginal wall deformation | Posterior tissue elasticity | Tissues/structures in posterior compartment |
7 | 2 | P1max_a | kPa | Maximum pressure at the area of pubic bone (anterior, A1 in Figure 2) | Proximity of pubic bone to vaginal wall and perineal body strength | Anatomic aspects and tissue elasticity | Tissues between vagina and pubic bone; perineal body |
8 | 2 | P2max_a | kPa | Maximum pressure at the area of urethra (anterior, A2 in Figure 2) | Elasticity/mobility of urethra | Anatomic aspects and tissue elasticity | Urethra and surrounding tissues |
9 | 2 | P3max_a | kPa | Maximum pressure at the cervix area (anterior, A3 in Figure 2) | Mobility of uterus and conditions of uterosacral and cardinal ligaments | Pelvic floor support | Uterosacral and cardinal ligaments |
10 | 2 | P1max_p | kPa | Maximum pressure at the perineal body (posterioir, see P1 in Figure 2) | Pressure feedback of Level III support | Pelvic floor support | Puboperineal, puborectal muscles |
11 | 2 | P2max_p | kPa | Maximum pressure at middle third of vagina (posterioir, see P2 in Figure 2) | Pressure feedback of Level II support | Pelvic floor support | Pubovaginal, puboanal muscles |
12 | 2 | P3max_p | kPa | Maximum pressure at upper third of vagina (posterioir, see P3 in Figure 2) | Pressure feedback of Level I support | Pelvic floor support | Iliococcygeal muscle, levator plate |
13 | 2 | G1max_a | kPa/mm | Maximum gradient at the area of pubic bone (anterior, see A1 in Figure 2) | Vaginal elasticity at pubic bone area | Anterior tissue elasticity | Tissues between vagina and pubic bone; perineal body |