A prosperous neuraxial anesthesia positioning ensures a raised chance of successful needle placement. The primary aim is to compare "Sitting Cross-legged Fetal Position -SCF" with "Lateral Decubitus Fetal Position-LDF" anatomically via sonography. Secondary aim is to compare their comfort.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Interspinous gap opening (ISGO) measurement in the SCF
Timeframe: For the SCF technique, ISGO is measured in the first 10 minutes(mins.) time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Left paraspinal muscle (LPM) measurements in the SCF
Timeframe: For the SCF technique, LPM is measured between the 10th and 20th mins. of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Right paraspinal muscle (RPM) measurements in the SCF
Timeframe: For the SCF technique, RPM is measured in between the 20th and 30th mins. of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
The mean of bilateral paraspinal muscles (MPM) in the SCF
Timeframe: For the SCF technique, MPM measurement is planned to be done in between the 30th and 40th mins. of the study,in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Subcutaneous tissue (ST) measurements in the SCF
Timeframe: For the SCF technique, ST measurement is planned to be done in between the 40th and 50th mins. of the study,in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
The skin to spinous process (S-SP) measurements in the SCF
Timeframe: : For the SCF technique, S-SP measurement is planned to be done in between the 50th and 60th mins. of the study,in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Interspinous gap opening (ISGO) measurement in the LDF
Timeframe: ISGO measurement in the LDF will be done right after NRS evaluation of the SCF, in between the 70th and 80th mins. of the study,in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Left paraspinal muscle (LPM) measurements in the LDF
Timeframe: LPM measurement in the LDF will be done in between the 80th and 90th mins. of the study,in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Right paraspinal muscle (RPM) measurements in the LDF
Timeframe: RPM measurement in the LDF will done in between the 90th and 100th mins. of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant through study completion up to 20 weeks.
The mean of bilateral paraspinal muscles (MPM) in the LDF
Timeframe: MPM measurement in the LDF will be done in between the 100th and 110th mins. time of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
Subcutaneous tissue (ST) measurements in the LDF
Timeframe: ST measurement in the LDF will be done in between the 110th and 120th mins. time, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
The skin to spinous process (S-SP) measurements in the LDF
Timeframe: S-SP measurement in the LDF will be done in between the 120th and 130th mins. of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of ISGO (ISGO SCF-LDF)
Timeframe: ISGO in the SCF measured in the first 10mins., and ISGO in the LDF measured in between the 70th and 80th mins. of the study, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of LPM (LPM SCF-LDF )
Timeframe: LPM in the SCF measured in between the 10th and 20th mins., and LPM in the LDF measured in between the 80th and 90th mins., in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of RPM (RPM SCF-LDF)
Timeframe: RPM in the SCF measured in between the 20th and 30th mins., and RPM in the LDF measured in between 90th and 100th mins., in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of MPM (MPM SCF-LDF)
Timeframe: MPM in the SCF measured in between the 30th and 40th mins., and MPM in the LDF measured in between 100th and 110th mins., in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of ST (ST SCF-LDF)
Timeframe: ST in the SCF measured in between the 40th and 50th mins., and ST in the LDF measured in between the 110th and 120th, in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.
the change of S-SP (S-SP SCF-LDF)
Timeframe: S-SP in the SCF measured in between the 50th and 60th mins., and S-SP in the LDF measured in between the 120th and 130th mins., in 10 mins. time of the total 3hr and 30 mins. study, for each participant, through study completion up to 20 weeks.