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Table 6 Clinically relevant potential confounders

From: Could sodium imbalances predispose to postoperative venous thromboembolism? An analysis of the NSQIP database

 

VTE

Mortality

Wound

Cardiac

Respiratory

Urinary

CNS

Sepsis

Bleeding

Composite Morbidity

Return OR

Readmission

Age

X

X

 

X

 

X

X

X

   

X

Gender

   

X

        

Race

X

           

Type of Anesthesia

X

X

 

X

        

ASA Class

 

X

 

X

X

     

X

X

Infected Surgical Wound Class

 

X

X

       

X

X

Mean Total Operation Time min

X

           

Intraop Transfusions

X

X

X

X

X

  

X

    

CHF w/in 30 days

X

X

 

X

X

      

X

MI w/in 6 months

X

X

 

X

        

History of angina

 

X

 

X

        

Tobacco use in past year

X

X

 

X

X

 

X

  

x

  

History of severe COPD

 

X

  

X

    

x

 

X

Esophageal varices in previous 6 months

 

X

      

X

x

  

Acute renal failure

X

X

          

Currently on dialysis

 

X

 

X

X

  

X

X

X

 

X

Impaired sensorium in previous 48 h

 

X

  

X

       

Hemiplegia

X

X

          

History of transient ischemic attacks

 

X

    

X

     

History of CVA with neurological deficit

X

X

    

X

  

X

  

History of CVA without neurological deficit

 

X

          

Tumor involving CNS

X

X

    

X

     

Bleeding disorder

 

X

      

X

 

X

X

Weight loss > 10% in previous 6 months

 

X

          

Disseminated cancer

X

X

 

X

X

  

X

 

X

 

X

Chemotherapy in previous 30 days

X

           

BMI

X

X

 

X

X

X

X

  

X

 

X

Diabetic on oral drugs or insulin

 

X

X

X

 

X

X

X

 

X

  

Hypertension requiring meds

 

X

 

X

  

X

     

Peripheral vascular disease

 

X

X

         

Rest pain or gangrene

X

X

     

X

    

Open wound (with or without infection)

  

X

    

X

  

X

X

Steroid use for chronic condition

X

      

X

    

Systemic sepsis in previous 48 h

 

X

          

WBC count

       

X

    

Platelet count

X

X

    

X

     

INR

        

X

   

Creatinine

 

X

          

Serum albumin

  

X

         

Emergency case

 

X

X

X

        

Surgical Specialty

X

X

          

Dyspnea

 

X

  

X

       

Functional health status Prior to Surgery

X

X

          

Ventilator dependent

 

X

  

X

       

Current pneumonia

 

X

  

X

  

X

    

Coma > 24 h

X

X

          

Paraplegia

X

           

Quadraplegia

X

           

Bilirubin

 

X

          

Hematocrit

 

X

 

X

        

PTT

        

X

   

Duration of Anesthesia

 

X

 

X

X

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