Detailed analysis of operating time learning curves in robotic prostatectomy by a novice surgeon
Authors: Dev Harveer , Sharma Naomi L. , Dawson Sarah N. , Neal David E. , Shah Nimish 
Published: October 2011

Study Type – Therapy (case series)

Level of Evidence 4

What's known on the subject? and What does the study add?

Despite the many descriptions of learning curves for open and laparoscopic‐assisted prostatectomy, there are few detailed reports describing the early phase of the robotic‐assisted learning curve. With the rapid uptake of robotic surgery and therefore training, multiple trainees increases the complexity of analysing an individual surgeon's performance, and often leads to the omission of initial procedures from published case series. Incomplete, inadequate or ‘shared’ data can limit the conclusions that can be drawn from the learning curve about individual surgical steps and their relative difficulty.

By measuring the operating time foreachsurgical step in the robotic‐assisted laparoscopic prostatectomy (RALP) procedure, we attempt to overcome these limitations. We describe a detailed analysis of RALP operating times for a single robotic‐naive surgeon in his first 150 cases. Through incorporating the findings of this study into our structured mentoring programme, it is possible to begin the training of new robotic‐naive surgeons at simpler surgical steps, in which the greatest gains in expediency are to be made. We anticipate that by identifying the more challenging surgical steps and targeting training towards them, we may expedite our future trainees' proficiency at RALP.

OBJECTIVES

Structured mentor‐led training programmes permit the safe introduction of novice trainees to robotic‐assisted laparoscopic prostatectomy (RALP).

We outline the first description of parallel learning curves for individual surgical steps and quantify the relative difficulty of each step to propose an order of training in our structured mentoring programme.

PATIENTS AND METHODS

A prospective ethically approved database was used to evaluate the operating times of each individual surgical step, in the first 150 RALP cases performed independently by a robotic‐naive laparoscopic surgeon.

Linear regression analysis was used to quantify the effect of surgeon experience on the operating time for each individual surgical step.

RESULTS

Univariate linear regression analysis revealed significant reductions in operating time over the first 150 cases for all of the RALP steps, with the exception of the Rocco stitch.

Multivariate linear regression analysis compensated for confounding variables and led to the identification of five surgical steps in which the operating time of each was significantly influenced by experience of the procedure.

The most substantial improvement in operating time was seen in the bladder take down step.

After taking into account the multivariate regression model, standardized univariate coefficients allowed an order of training to be identified for future RALP novices, of increasing complexity rather than order of surgery, beginning with the bladder take down step and ending with the vesico‐urethral anastomosis.

CONCLUSIONS

We can begin the training of new robotic‐naive surgeons at simpler surgical steps, in which the greatest gains in expediency are made.

We anticipate that identifying the more challenging surgical steps from this study and targeting training towards them may expedite our future trainees' proficiency at RALP.