In Japan in 2019, doctors used robots to do tough stomach and bowel surgeries. Even though the operations took a long time, there was very little bleeding and almost never had to switch to open surgery, which means the robot systems worked really well.

What we've found so far is that in Japan in 2019, robot-assisted esophagectomy, gastrectomy, and proctectomy were performed with minimal blood loss and very low rates of conversion to open surgery, despite longer operative times [1]. Our analysis of the available research suggests that robotic systems were used successfully for these complex gastrointestinal procedures. Based on what we've reviewed so far, the surgeries took a considerable amount of time to complete, indicating that the procedures were lengthy [1]. However, the amount of blood lost during surgery was very low, which may mean less strain on the patient’s body and potentially fewer complications related to bleeding [1]. Additionally, the need to switch from robot-assisted to open surgery—known as conversion—was extremely rare [1]. This suggests that once a robot-assisted approach was started, it was almost always completed without requiring a more invasive backup method [1]. The evidence we've reviewed leans toward the idea that robotic surgery in Japan during 2019 was technically feasible and stable for major upper and lower gastrointestinal operations [1]. We only have one assertion to base this on, supported by 44 individual pieces of evidence, but no studies or claims that contradict it [1]. Still, we can’t say how this compares to other countries or time periods, nor can we determine long-term outcomes from this data alone. Our current analysis shows that while the operations took time, the precision of the robotic systems may have helped control bleeding and avoid the need for open surgery. But because the evidence is limited to one assertion, we can’t be sure how strong or generalizable these findings are. Practical takeaway: In Japan in 2019, robotic stomach and bowel surgeries took time but seemed to go smoothly, with little bleeding and almost no need to switch to open surgery.