Liver segmentectomy as anatomically precise resections. An experimental study in sheep

Area of Science:

• Hepatobiliary surgery
• Surgical anatomy
• Minimally invasive techniques

Background:

• Hepatic segmental resections are crucial for treating liver tumors and other conditions.
• Traditional methods for identifying liver segments can lack precision, potentially leading to incomplete resections or damage to healthy tissue.
• Improving the accuracy of hepatic resections is essential for patient outcomes.

Purpose of the Study:

• To evaluate a novel technique for anatomically precise hepatic segmental resection.
• To compare the precision and biochemical outcomes of this new technique against traditional methods and a sham operation.
• To establish the feasibility and safety of enhanced precision in liver surgery.

Main Methods:

• An experimental study was conducted on 50 sheep.
• The new technique involved operative ultrasonography and methylene blue injection to delineate segmental boundaries.
• Traditional resections relied solely on surface anatomy knowledge; a sham group served as a control.

Main Results:

• The new technique achieved anatomically precise resections in 50-67% of cases across different segments (II, III, IV).
• In contrast, the traditional technique resulted in only 10% precise resections for segment III (p < 0.02).
• While precise resections took longer, blood loss, survival, and transaminase levels were similar; however, the margin of necrosis was significantly reduced.

Conclusions:

• Anatomically precise hepatic resections are technically feasible using intraoperative ultrasonography and methylene blue staining.
• This advanced technique offers significantly greater accuracy compared to traditional methods.
• Despite a longer operative duration, the precise method shows no detrimental consequences and reduces the margin of necrosis.