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Four Eyes Principle Reduces Re-Operation Rate in Converting Phase From Open to Laparoscopic Pyloromyotomy
Johannes Meyer1, Karel Spacil2, Maximilian Stehr1
1Department of Pediatric Surgery and Pediatric Urology, Cnopfsche Kinderklinik/Klinikum Hallerwiese, Diakoneo, Academic Teaching Hospital of University Hospital Erlangen, 90419, Nuremberg, Germany.
Journal of Pediatric Surgery
|September 13, 2025
Summary
Implementing the four eyes principle in laparoscopic pyloromyotomy for infantile pyloric stenosis significantly reduced re-operations. This safety measure aids surgical teams during the transition to minimally invasive techniques.
Area of Science:
- Pediatric Surgery
- Minimally Invasive Surgery
- Patient Safety
Background:
- Laparoscopic pyloromyotomy is the standard for infantile pyloric stenosis.
- Many departments are transitioning from open to laparoscopic procedures.
- The four eyes principle is a safety mechanism used in various fields.
Purpose of the Study:
- To evaluate the impact of the four eyes principle on laparoscopic pyloromyotomy outcomes.
- To assess complication rates during the conversion phase to laparoscopic surgery.
- To determine if the four eyes principle reduces re-operations.
Main Methods:
- Retrospective analysis of 103 patients with infantile pyloric stenosis over ten years.
- Comparison of three groups: open surgery (OS), laparoscopic surgery (LS), and laparoscopic surgery with the four eyes principle (FELS).
- Analysis focused on incomplete myotomy, mucosal perforation, and re-operation rates.
Main Results:
- Patients in the FELS group had significantly fewer re-operations compared to the LS group (p=0.0336).
- No significant differences in re-operation rates or main complications were found between OS and FELS groups.
- Mean operating times were 30.5 min (LS), 34.5 min (FELS), and 41.0 min (OS).
Conclusions:
- The four eyes principle effectively reduces re-operation rates in laparoscopic pyloromyotomy during the transition period.
- This principle is a valuable tool for decreasing the learning curve associated with new surgical techniques.
- It enhances patient safety and procedural efficiency in pediatric surgery.

