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A recent study published in JAMA Network Open has reignited concerns about the so-called “weekend effect” in surgical outcomes. Researchers from Houston Methodist Hospital, UCLA, the University of Toronto, and other institutions analyzed data from 429,691 patients to determine whether undergoing surgery on a Friday led to worse postoperative results compared to surgeries performed after the weekend.
Understanding the Weekend Effect
The weekend effect is a long-standing concern in medicine, referring to the trend of poorer patient outcomes for medical procedures performed closer to the weekend. In surgical settings, this effect has been attributed to variations in hospital staffing, reduced access to specialists, and changes in care processes on weekends.
In popular culture, a similar concern exists in other industries, such as automobile manufacturing, where vehicles built on a Friday were thought to have more defects due to workers being distracted by upcoming weekend plans. While this idea has been largely anecdotal, the weekend effect in healthcare has been the subject of serious research for years.
Findings from the Study
In the study titled Postoperative Outcomes Following Preweekend Surgery, researchers conducted a retrospective, population-based cohort analysis using data from Ontario, Canada. The study focused on 25 common surgical procedures performed between 2007 and 2019, comparing outcomes for patients who underwent surgery immediately before the weekend (Friday or pre-holiday) versus those who had procedures immediately after the weekend (Monday or post-holiday).
Researchers examined short-term (30 days), intermediate (90 days), and long-term (one year) postoperative outcomes, including mortality, readmission rates, complications, hospital length of stay, and surgery duration. Their key findings included:
- Higher risk of complications: Patients who underwent surgery before the weekend had a 5% higher likelihood of experiencing a combination of mortality, complications, and readmissions within 30 days.
- Increased mortality rates: The risk of death was 9% higher at 30 days, 10% higher at 90 days, and 12% higher at one year for pre-weekend surgery patients.
- Longer hospital stays: Those undergoing surgery before the weekend remained hospitalized longer compared to post-weekend patients.
- Differences in surgeon demographics: Surgeons performing Friday procedures had a median age of 47 years and 14 years of experience, compared to 48 years and 17 years of experience for those operating on Mondays.
- Elective vs. urgent surgeries: Interestingly, elective procedures performed before the weekend showed worse postoperative outcomes, while urgent, unplanned surgeries had slightly better results when conducted on Fridays.
Implications and Future Considerations
The study suggests that hospital staffing variations, limited specialist availability, and differences in perioperative care could contribute to the observed disparities. However, the exact reasons remain unclear. Researchers emphasize that further investigation is needed to develop strategies ensuring consistent postoperative care, regardless of the day of the week.
While the study does not directly imply medical negligence, it acknowledges the human element in healthcare. The concern that surgeons and hospital staff may be mentally preoccupied with weekend plans remains speculative but is not entirely dismissible.
Conclusion
These findings reinforce the need for hospitals to assess whether changes in staffing or procedural workflows could improve outcomes for Friday surgeries. Patients, too, may wish to consider scheduling elective surgeries earlier in the week when possible.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Patients should consult with their healthcare providers before making any medical decisions.
For more information: Sanjana Ranganathan et al., Postoperative Outcomes Following Preweekend Surgery, JAMA Network Open (2025). DOI: 10.1001/jamanetworkopen.2024.58794
