Time of day is associated with postoperative morbidity: an analysis of the national surgical quality improvement program data.
OBJECTIVE
To examine the association between surgical start time and morbidity and mortality for nonemergent procedures.


BACKGROUND
Patients require medical services 24 hours a day. Several studies have demonstrated a difference in outcomes over the course of the day for anesthetic adverse events, death in the ICU, and dialysis care. The relationship between operation start time and patient outcomes is yet undefined.


METHODS
We performed a retrospective cohort study of 144,740 nonemergent general and vascular surgical procedures performed within the VA Medical System 2000-2004 and entered into the National Surgical Quality Improvement Program Database. Operation start time was the independent variable of interest. Logistic regression was used to adjust for patient and procedural characteristics and to determine the association between start time and, in 2 independent models, mortality and morbidity.


RESULTS
Unadjusted later start time was significantly associated with higher surgical morbidity and mortality. After adjustment for patient and procedure characteristics, mortality was not significantly associated with start time. However, after appropriate adjustment, operations starting between 4 pm and 6 pm were associated with an elevated risk of morbidity (OR = 1.25, P < or = 0.005) over those starting between 7 am and 4 pm as were operations starting between 6 pm and 11 pm (OR = 1.60, P < or = 0.005).


CONCLUSIONS
When considering a nonemergent procedure, surgeons must bear in mind that cases that start after routine "business" hours within the VA System may face an elevated risk of complications that warrants further evaluation.
Kelz
Rachel R
RR
Department of Surgery, Philadelphia VA Medical Center, Philadelphia, PA, USA. rapaporr@uphs.upenn.edu
Freeman
Kathryn M
KM
Hosokawa
Patrick W
PW
Asch
David A
DA
Spitz
Francis R
FR
Moskowitz
Miriam
M
Henderson
William G
WG
Mitchell
Marc E
ME
Itani
Kamal M F
KM
D015331:Cohort Studies; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D012189:Retrospective Studies; D013514:Surgical Procedures, Operative / Q000009:adverse effects* / Q000401:mortality*; D013995:Time