title: The value of preoperative medical testing for vitreoretinal surgery.
abstract: OBJECTIVE
  To determine whether preoperative medical testing reduces the risk of postoperative systemic adverse events after vitreoretinal surgery.
  
  
  METHODS
  Retrospective cohort study at a single academic university hospital involving a total of 2,215 patients undergoing vitreoretinal surgery. Medical charts of 2,215 patients who underwent vitreoretinal surgery between January 2002 and November 2011 at Vanderbilt University were reviewed for baseline comorbidities, preoperative testing, type of anesthesia during surgery, and systemic adverse events occurring within 30 days after surgery. Main outcome measures were the association of baseline characteristics and preoperative testing with postoperative systemic adverse events.
  
  
  RESULTS
  Approximately a half of patients had electrolyte, renal function, and electrocardiogram evaluation. The most common comorbidities were hypertension (53%), diabetes mellitus (37%), and coronary artery disease (18%). The most common preoperative testing performed was blood glucose (58%). A total of 102 systemic adverse events occurred in 89 of 2,215 patients (4%) within the first 30 days after surgery with the majority (72%) occurring within the first 24 hours. The most common adverse event was bradycardia (34%) followed by desaturation (25%). Patients with a history of coronary artery disease, asthma, chronic renal disease, or receiving general anesthesia had a 2.04 (P = 0.01), 2.18 (P = 0.03), 2.76 (P < 0.01), and 3.72 (P < 0.001) increased odds of developing postoperative systemic adverse events, respectively. Multivariate logistic regression analysis demonstrated no significant correlation between preoperative testing and postoperative adverse events.
  
  
  CONCLUSIONS
  Incidence of postoperative systemic adverse events after vitreoretinal surgery was 4% and was significantly increased in patients with coronary artery disease, asthma, chronic renal disease, or receiving general anesthesia. In this series, preoperative testing did not measurably influence rates of postoperative systemic complications.
authors.affiliation: Department of Ophthalmology, Vanderbilt University, Nashville, Tennessee.
authors.forename: Ajay
authors.initials: A
authors.lastname: Shalwala
authors.forename: Richard Y
authors.initials: RY
authors.lastname: Hwang
authors.forename: Ariana
authors.initials: A
authors.lastname: Tabing
authors.forename: Paul
authors.initials: P
authors.lastname: Sternberg
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Kim
mesh_terms: D001786:Blood Glucose; D015331:Cohort Studies; D015897:Comorbidity; D003955:Diagnostic Tests, Routine; D005260:Female; D006304:Health Status; D006784:Hospitals, Teaching; D006801:Humans; D008297:Male; D008875:Middle Aged; D019990:Perioperative Care; D011183:Postoperative Complications; D012189:Retrospective Studies; D012307:Risk Factors; D057586:Vitreoretinal Surgery
chemical_list: D001786:Blood Glucose