Mayo Clinic Researchers Find ‘July Effect’ to be a Myth

An observational study of nearly 1 million spine surgeries between 2001 and 2008 by Mayo Clinic researchers reveals that the ‘July Effect’, where July is assumed to be the worst month to be a patient due to fresh influx of residents and fellows at teaching hospitals, is simply a myth. In addition, no substantial "July Effect" was observed in higher-risk patients, those admitted for elective surgery or patients undergoing simple or complex spinal procedures. The research was published online Tuesday in Journal of Neurosurgery: Spine.

"We hope that our findings will reassure patients that they are not at higher risk of medical complications if they undergo spinal surgery during July as compared to other times of the year," says study co-author Jennifer McDonald, Ph.D., a Mayo Clinic radiologist. "While we only looked at spinal surgeries, we think it's likely we'd find similar outcomes among other surgeries and procedures."

Researchers analyzed 2001 to 2008 data in the Nationwide Inpatient Sample, a large public database of information on hospitalized U.S. patients.

The researchers found that the incidents of all outcomes studied were higher in teaching hospitals, those with residents and fellows, than in nonteaching hospitals. In the teaching hospitals, minimally higher rates of postoperative infection and patient discharge to a long-term facility were found during July when compared with other months, but they were not high enough to establish a "July Effect."

In-hospital deaths and postoperative complications did not differ according to the month of admission, the study found.

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Source-Eurekalert