Robotic cholecystectomy was linked to fewer adverse outcomes in difficult gallbladders

Design

Retrospective multihospital cohort with inverse-probability weighting for cost

Population

1,828 adults undergoing robotic (806) or laparoscopic (1,022) cholecystectomy

Primary outcome

Conversion or Clavien-Dindo ≥3 complication; total variable cost

Effect

Adverse outcome 3.3% robotic vs 8.7% laparoscopic; high-risk at BMI 30, laparoscopy OR 3.69 (2.04–6.69)

This JAMA Surgery study, published on 16 September, reviewed 1,828 minimally invasive cholecystectomies at eight hospitals in one US health system in 2020 and 2021, all by surgeons who routinely performed both robotic and laparoscopic operations. Difficulty was graded before surgery with the Nassar score.

Robotic cholecystectomy was associated with fewer conversions or Clavien-Dindo grade 3 or higher complications (3.3% vs 8.7%). The difference depended on difficulty and BMI: in high-risk gallbladders at BMI 30, laparoscopy carried higher odds of an adverse outcome (OR 3.69), and in lower-risk cases the approaches were similar unless BMI was about 35. Robotic surgery cost about US$2,200 to $2,400 more per case at every risk level.

The practical reading is selection rather than conversion of all cholecystectomy to the robot. For most straightforward gallbladders, laparoscopy performed as well at lower cost. Where a robot is available, it may earn its cost in the obese patient with a difficult gallbladder.

• Grade expected difficulty before surgery; the Nassar score was used here.
• In straightforward gallbladders at normal BMI, outcomes were similar and laparoscopy was cheaper.
• Consider the robotic approach, where available, for difficult gallbladders in patients with obesity.
• Weigh the extra cost per case, which applied at every risk level.
• Keep bailout options, including subtotal cholecystectomy, whichever platform is used.

Why it matters

It reframes the robot versus laparoscopy debate from which is better to which patient benefits.

Don't overread it

This was retrospective and non-randomised; surgeons chose the approach, and residual selection bias is likely.

The statistics, in plain English

An odds ratio of 3.69 for laparoscopy in high-risk cases means the odds of conversion or major complication were almost four times higher, but the interval (2.04 to 6.69) is wide. The overall 3.3% vs 8.7% difference mixes easy and hard cases, so the subgroup pattern is the more useful result.

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