This retrospective, population-based cohort study will evaluate the comparative effectiveness of peripheral nerve blocks on patient outcomes after ambulatory shoulder surgery in adults patients undergoing surgery in Ontario.
First, investigators will validate health administrative data codes to demonstrate the accuracy of Ontario-wide anesthesia type and regional anesthesia interventions using a reference standard (Ottawa Hospital Data Warehouse data). Then, these validated exposures, in combination with validated outcome measures, will be used to examine the impact of anesthesia interventions on patient and health system outcomes for ambulatory shoulder surgery.
Study Type
OBSERVATIONAL
Enrollment
59,644
No nerve block identified through physician billing codes
Nerve block identified through physician billing codes
Postoperative Death, Admission, Readmission or Emergency Department Visits
Composite outcome of: 1) unplanned admissions on the day of surgery , 2) post-discharge emergency department visits within 7 days of surgery, 3) readmission within 30 days of surgery, and 4) death from any cause
Time frame: Date of surgery to 7 days (ED visits) and 30 days (readmissions) after surgery or death date, whichever came first
Health System Costs
Costs in Canadian dollars will be calculated using standardized patient-level costing algorithms.
Time frame: Date of surgery to 7 days and 30 days after surgery or death date, whichever came first
Neurology Consultations or Diagnostics
Occurrence of neurology consult and/or nerve conduction study
Time frame: Date of surgery to 90 days after surgery or death date, whichever came first
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