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Choosing the location for non-image guided abdominal paracentesis
Hideki Sakai1, Todd A Sheer, Michel H Mendler
1Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Kashiwa City Hospital, Kashiwa, Chiba, Japan.
Summary
The left lower quadrant (LLQ) is the optimal site for paracentesis, offering a thinner abdominal wall and deeper fluid compared to the infraumbilical midline (ML). This improves needle access for patients with cirrhosis and ascites.
Area of Science:
- Hepatology
- Medical Imaging
- Surgical Procedures
Background:
- Paracentesis is a common procedure for managing ascites in cirrhosis patients.
- Obesity epidemic has led to increased abdominal wall thickness, complicating paracentesis.
- Optimal paracentesis site remains unstudied, posing challenges for needle insertion.
Purpose of the Study:
- To determine the ideal anatomical location for paracentesis.
- To identify the site with the thinnest abdominal wall and deepest fluid.
- To compare the infraumbilical midline (ML) and left lower quadrant (LLQ) for paracentesis.
Main Methods:
- Ultrasound measurements of abdominal wall thickness and ascites depth were performed.
- Measurements were taken in the infraumbilical ML and LLQ positions.
- 52 patients with cirrhosis and ascites were included in the study.
Main Results:
- The LLQ demonstrated a significantly thinner abdominal wall (1.8 cm vs. 2.4 cm; P<0.001).
- Ascites depth was significantly greater in the LLQ (2.86 cm vs. 2.29 cm; P=0.017).
- The left lateral oblique position further enhanced ascites depth in the LLQ (4.57 cm vs. 2.78 cm; P<0.0001).
Conclusions:
- The left lower quadrant (LLQ) is the preferred location for paracentesis.
- LLQ offers improved safety and efficacy compared to the infraumbilical midline (ML) site.
- This finding is crucial for optimizing paracentesis in obese patients with ascites.