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Effect of Surgeon Volume on Complications, Length of Stay, and Costs Following Anterior Cervical Fusion.

Spine 2017 March 16
STUDY DESIGN: Retrospective cohort.

OBJECTIVE: To identify the association between surgeon volume and inpatient complications, length of stay, and costs associated with ACF.

SUMMARY OF BACKGROUND DATA: Increased surgeon volume may be associated with improved outcomes after surgical procedures. However, there is a lack of information on the effect of surgeon volume on short-term outcomes after anterior cervical fusion (ACF).

METHODS: A retrospective cohort study of ACF patients was performed using the Nationwide Inpatient Sample (NIS) from 2003 to 2009. Surgeon volume was divided into three categories, volume <25th percentile, 25th to 74th percentile, and ≥75th percentile of surgeon volume. Multivariate regression was used to compare the rates of adverse events, hospital length of stay, and total hospital costs between surgeon volume categories.

RESULTS: A total of 419,212 ACF patients were identified. The 25th percentile for volume was 5 cases per year, and the 75th percentile for volume was 67 cases per year. Volume <25th percentile was associated with increased rates of any adverse event (odd ratio, OR 3.8, P < 0.001), and multiple individual complications including death (OR 2.5, P=0.014), myocardial infarction (OR4.4, P < 0.001), sepsis (OR 4.1, P < 0.001), and surgical site infection (OR 4.0, P < 0.001). Notably, volume ≥75th percentile was associated with decreased rates of any adverse event (OR 0.7, P < 0.001) and death (OR 0.6, P = 0.028). On multivariate analysis, length of stay was significantly increased by 2.3 days (P < 0.001) for surgeons <25th percentile of volume and was decreased by 0.3 days for surgeons with volume ≥75th percentile. Hospital costs were $4569 more for surgeons with <25th percentile of volume and $1213 less for surgeons with ≥75th percentile volume.

CONCLUSION: In this nationally representative sample, surgeons with volume <25th percentile had significantly increased complications, length of stay, and costs. Conversely, surgeons with ≥75th percentile volume experienced decreased complications, length of stay, and costs.

LEVEL OF EVIDENCE: 4.

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