Does Time of Day Affect Quality of Breast Cancer Surgery?

Background: There is a hypothesis that the time of day can affect the outcomeof medical procedures and surgical operations. The current study was designed toassess whether time of day can influence the quality of breast cancer surgery or not.Methods: Patients who underwent breast cancer surgery and axillary lymphnode dissection in Tehran, Iran between March 2012 and March 2013 wereenrolled. Surgeries were categorized into two groups based on the time of initiation(before and after 1 pm).We considered the number of dissected lymph node as anindicator of operation quality. In this way, dissection of at least six lymph nodeswas considered as an adequate number of lymph node examinations.Results:Atotal of 134 patients were enrolled. Median start time of surgery was11 am. Surgeries were performed before and after 1 pm in 105 (78.4%) and29(21.6%) patients, respectively. The association between time and the number ofdissected lymph nodes was significant when they were considered either as acategorical (P= 0.002) or continuous variables (P= 0.039).Conclusions: Based on our results, it can be suggested that breast surgerieswith later start time might have lower quality.

Does Time of Day Affect Quality of Breast Cancer Surgery? Keywords:

Quality , time of day , breast surgery , axillary dissection