To investigate the thickness variation of the transversus abdominis at the abdominal wall level in different populations and its clinical significance in the transversus abdominis plane block.

The clinical and CT data of 60 inpatients in the First Department of Gastrointestinal Surgery, Jinan Central Hospital from January to December 2021 were retrospectively analyzed. The thickness of transverse abdominis and abdominal wall at different levels were measured using CT image LIS system. The thickness of transverse abdominis and abdominal wall and their influencing factors were analyzed.

There was no significant difference in the thickness of the transversus abdominis at the level of the umbilicus and the anterior superior iliac spine between different body mass index (BMI), gender and age (P>0.05). There were significant differences in the thickness of the abdominal wall at the level of the umbilicus and the anterior superior iliac spine between different gender and BMI (P<0.05), but no significant differences between different ages (P>0.05).

The thickness of the transversus abdominis is relatively constant at the abdominal wall level in different populations, which has important reference significance for laparoscopic-assisted transversus abdominis plane block.