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No 'July phenomenon' for neurosurgery patients, reports Neurosurgery
Date:9/20/2012

Philadelphia, Pa. (September 20, 2012) For patients undergoing neurosurgery at teaching hospitals, there's no "July phenomenon" of increased death and complication rates when new residents start their training, reports a study in the September issue of Neurosurgery, official journal of the Congress of Neurological Surgeons. The journal is published by Lippincott Williams & Wilkins, a part of Wolters Kluwer Health.

The risk of adverse outcomes after common brain and spinal procedures are no different in July compared to any other month, according to the research by Dr. Brian L. Hoh of University of Florida and colleagues.

Risks of Neurosurgery Don't Increase in July

To investigate whether there was a real "July phenomenon" affecting neurosurgical risks, the researchers analyzed data from a nationwide hospital database (the National Inpatient Sample) from 1998 to 2008. They focused on nearly 860,000 hospital admissions for four different types of common neurosurgery procedures: nontraumatic brain hemorrhage (bleeding), central nervous system (CNS) trauma, CNS tumors, and hydrocephalus ("water on the brain").

For procedures performed in teaching hospitalswhere residents are involved in patient care, including surgeryrates of complications and death were compared for the month of July versus all other months. The analysis included adjustment for patient and hospital characteristics.

The results showed no significant difference in the risk of death for operations performed in July. For example, in patients undergoing surgery for CNS tumorsthe largest of the four categoriesthe mortality rate was 7.1 percent in July compared to 7.2 percent in all other months. The complication rate was 1.4 percent in July and in all other months.

Death and complication rates were also similar for July versus other months in the other three diagnostic categories. Analysis of patients treated at non-teaching hospitalswhich don't train residentsalso showed no significant differences in mortality or complications rates.

Previous studies have evaluated whether there is any evidence of a "July phenomenon" in various medical specialties. The results have been inconsistent, although most studies have found no difference in at the start of the academic year in Julywhen new graduates start residency training and current residents take on increased responsibilities. The new study is one of the few to look at whether there is any difference in the outcomes of common neurosurgery procedures related to the "July phenomenon."

Based on their large, nationwide study, Dr. Hoh and colleagues conclude, "No 'July phenomenon' was found for neurosurgical mortality or complications in patients with nontraumatic hemorrhage, CNS trauma, CNS tumor, or hydrocephalus." The researchers acknowledge some weaknesses of their studyparticularly the fact that it couldn't detect "near-miss" errors that don't lead to death or serious complications. They also note, "The lack of a July phenomenon may be attributable to the increased supervision by faculty and more senior residents during the start of the academic year."


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Contact: Connie Hughes
Connie.Hughes@wolterskluwer.com
646-674-6348
Wolters Kluwer Health
Source:Eurekalert

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