Weekend effect in non-elective abdominal aortic aneurysm repair.

Area of Science:

• Vascular Surgery
• Health Services Research
• Patient Outcomes

Background:

• The 'weekend effect' suggests worse patient outcomes for weekend admissions, influencing UK health policy.
• Recent evidence questions the weekend effect, citing confounding factors and coding inaccuracies.
• This study investigates these factors in patients with acute abdominal aortic aneurysm (AAA).

Purpose of the Study:

• To investigate the 'weekend effect' in patients undergoing non-elective acute abdominal aortic aneurysm (AAA) repair.
• To determine if confounding factors and coding issues explain apparent outcome disparities.
• To assess the impact of weekend admission on in-hospital mortality and morbidity for AAA patients.

Main Methods:

• A case-control study analyzed UK National Vascular Registry data (Jan 2013-Dec 2015) for non-elective AAA repair.
• Patients were categorized into weekday and weekend treatment groups.
• Outcomes (mortality, length of stay, complications) were compared after correcting for confounders and coding variations, particularly for ruptured AAA.

Main Results:

• Initially, weekend admissions showed higher mortality (OR 1.69) and longer hospital stays (OR 1.21).
• After correcting for confounding factors and coding issues, the weekend effect disappeared for mortality (corrected OR 1.09) and length of stay (corrected OR 1.06) in ruptured AAA cases.
• Similar findings were observed for other morbidity outcomes, indicating no significant weekend disparity.

Conclusions:

• There is no statistically significant 'weekend effect' in the treatment of non-elective acute abdominal aortic aneurysm (AAA) in the UK.
• Apparent outcome differences are attributable to inadequate correction for confounding variables and coding inaccuracies.
• Findings challenge the basis for health policy changes solely attributed to a weekend admission penalty.