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Updated: May 24, 2026
Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
Published on: April 17, 2019
Effects of pneumoperitoneum and body position on the morphology of abdominal vascular structures analyzed in MRI
Jose L Moyano-Cuevas1, Francisco M Sánchez-Margallo, Juan Maestre-Antequera
1Bioengineering and Health Technology Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain. jmoyano@ccmijesususon.com
Purpose:
To analyze the complications of laparoscopy in different vascular structures using magnetic resonance imaging (MRI). MRI has become a key tool in laparoscopic surgery. During these procedures, pneumoperitoneum creation and placing the patient in the surgical position provoke different changes in the splachnic circulation.
Materials And Methods:
Ten pigs were included in the study. MRI studies of the abdominal area were carried out in four different situations of abdominal pressure and body position.
Results:
Changes in the area of the lumen of the portal vein and the abdominal aorta were analyzed in all situations. A significant reduction in the area of the abdominal aorta was observed after the pneumoperitoneum in supine and anti-Trendelemburg position. The lumen of the portal vein was significantly reduced in all analyzed situations except when placing the patient in anti-Trendelemburg without pneumoperitoneum, in which case the area was increased.
Conclusion:
The creation of pneumoperitoneum provokes morphological changes in the lumen of different abdominal vessels as a consequence of the increase of pressure. Furthermore, the combination of pneumoperitoneum together with the anti-Trendelemburg position results in a more significant reduction of the lumen of the portal vein and the abdominal aorta.
Insights
Laparoscopy with pneumoperitoneum significantly alters abdominal vessel size, particularly the aorta and portal vein. Combining pneumoperitoneum with anti-Trendelenburg position causes the most substantial lumen reduction in these key vessels.
Area of Science:
- Medical imaging
- Surgical procedures
- Vascular anatomy
Background:
- Laparoscopic surgery relies on magnetic resonance imaging (MRI) for visualization.
- Pneumoperitoneum and patient positioning during laparoscopy impact splanchnic circulation.
Purpose of the Study:
- To analyze the effects of laparoscopy on abdominal vascular structures using MRI.
- Investigate changes in portal vein and abdominal aorta dimensions.
Main Methods:
- MRI scans of ten pigs were performed under varying abdominal pressures and body positions.
- Evaluated changes in lumen area of the portal vein and abdominal aorta.
Main Results:
- Pneumoperitoneum significantly reduced abdominal aorta area in supine and anti-Trendelenburg positions.
- Portal vein lumen decreased in most scenarios, except anti-Trendelenburg without pneumoperitoneum where it increased.
Conclusions:
- Pneumoperitoneum induces morphological changes in abdominal vessel lumens due to increased pressure.
- Combined pneumoperitoneum and anti-Trendelenburg position maximally reduce portal vein and aorta lumen size.
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