A prosperous neuraxial anesthesia positioning ensures a raised chance of successful needle placement. The primary aim is to compare "The Anatolian sitting position-ASP" with "The Sitting Fetal Position-SFP" sonographically. Secondary aim is to compare their comfort.
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Interspinous gap opening (ISGO) measurement in the ASP
Timeframe: For the ASP technique, ISGO is measured in the first 10 minutes(mins.) time, for each participant, through study completion.
Left paraspinal muscle (LPM) measurements in the ASP
Timeframe: For the ASP technique, LPM is measured in between 10mins. and 20mins. time, for each participant, through study completion.
Right paraspinal muscle (RPM) measurements in the ASP
Timeframe: For the ASP technique, RPM is measured in between 20mins. and 30mins. time, for each participant, through study completion.
The mean of bilateral paraspinal muscles (MPM) in the ASP
Timeframe: For the ASP technique, MPM measurement is planned to be done in between 30mins. and 40mins. time, for each participant, through study completion.
Subcutaneous tissue (ST) measurements in the ASP
Timeframe: For the ASP technique, ST measurement is planned to be done in between 40mins. and 50mins. time, for each participant, through study completion.
The skin to spinous process (S-SP) measurements in the ASP
Timeframe: For the ASP technique, S-SP measurement is planned to be done in between 50mins. and 1 hour(hr.) time, for each participant, through study completion.
Interspinous gap opening (ISGO) measurement in the SFP
Timeframe: For the SFP technique, ISGO measurement is planned to be done, right after NRS evaluation of the ASP, in between 1hr.10mins. and 1hr.20mins. time, for each participant, through study completion.
Left paraspinal muscle (LPM) measurements in the SFP
Timeframe: For the SFP technique, LPM measurement is planned to be done in between 1hr.20mins. and 1hr.30mins. time, for each participant, through study completion.
Right paraspinal muscle (RPM) measurements in the SFP
Timeframe: For the SFP technique, RPM measurement is planned to be done in between 1hr.30mins. and 1hr.40mins. time, for each participant, through study completion.
The mean of bilateral paraspinal muscles (MPM) in the SFP
Timeframe: For the SFP technique, MPM measurement is planned to be done in between 1hr.40mins. and 1hr.50mins. time, for each participant, through study completion.
Subcutaneous tissue (ST) measurements in the SFP
Timeframe: For the SFP technique, ST measurement is planned to be done in between 1hr.50mins. and 2hrs. time, for each participant, through study completion.
The skin to spinous process (S-SP) measurements in the SFP
Timeframe: For the SFP technique, S-SP measurement is planned to be done in between 2hrs. and 2hr.10mins. time, for each participant, through study completion.
the change of ISGO (ISGO ASP-SFP)
Timeframe: ISGO in the ASP is measured in the first 10mins., and ISGO in the SFP is measured in between 1hr.10 mins. and 1hr.20mins. time, through study completion.
the change of LPM (LPM ASP-SFP)
Timeframe: LPM in the ASP is measured in between 10mins. and 20mins. time, and LPM in the SFP is measured in between 1hr.20mins and 1hr.30mins. time, through study completion.
the change of RPM (RPM ASP-SFP)
Timeframe: RPM in the ASP is measured in between 20mins. and 30mins. time, and RPM in the SFP is measured in between 1hr.30mins. and 1hr.40mins. time, through study completion.
the change of MPM (MPM ASP-SFP)
Timeframe: MPM in the ASP is measured in between 30mins. and 40mins. time, and MPM in the SFP is measured in between 1hr.40mins and 1hr.50mins. time, through study completion.
the change of ST (ST ASP-SFP)
Timeframe: ST in the ASP is measured in between 40mins. and 50mins. time, and in the SFP is measured in between 1hr.50mins and 2hrs. time, through study completion.
the change of S-SP (S-SP ASP-SFP)
Timeframe: S-SP in the ASP is measured in between 50mins. and 1hr. time, and S-SP in the SFP is measured in between 2 hrs. and 2hrs.10mins. time, through study completion.