Does "July effect" exist in colonoscopies performed at teaching hospitals?

Area of Science:

• Gastroenterology
• Healthcare Quality Improvement
• Medical Education

Background:

• The
• July effect" hypothesizes that patient outcomes may worsen in teaching hospitals during July due to new resident physicians starting their training.
• This study investigates if this effect impacts colonoscopy outcomes.

Purpose of the Study:

• To compare colonoscopy outcomes between the early (July-September) and later (April-June) academic year periods.
• To determine if a
• July effect" influences patient safety and procedural success in colonoscopies performed at urban teaching hospitals.

Main Methods:

• Utilized the National Inpatient Sample (NIS) database (2010-2014) to identify adult patients undergoing inpatient colonoscopy at urban teaching hospitals.
• Employed International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9 CM) codes to define outcomes and complications.
• Statistical analyses included Pearson's Chi-square, Student's t-test, and hierarchical logistic regression to compare early versus later academic year periods.

Main Results:

• Over 617,000 colonoscopies were analyzed; no significant differences were observed in all-cause mortality, colonic perforations, or postoperative infections.
• Bleeding/hematoma rates were marginally higher in the later academic months (0.8% vs. 0.9%), but overall complication rates remained low and comparable.
• Length of stay, hospitalization charges, and discharge destinations showed no statistically significant variations between the two academic periods.

Conclusions:

• The study found no evidence of a
• July effect" impacting colonoscopy outcomes at urban teaching hospitals.
• Colonoscopy procedural success and patient safety appear unaffected by the academic year timing.