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Table 2 Cox proportional hazards regression model analysis for prognostic factors of emergency ECMO use

From: The modified SAVE score: predicting survival using urgent veno-arterial extracorporeal membrane oxygenation within 24 hours of arrival at the emergency department

Variables

Univariate analysis

Multivariate analysis

Hazard ratio (95 % CI)

p value

Hazard ratio (95 % CI)

p value

SAVE score

0.92 (0.90-0.95)

<0.001

0.92 (0.88–0.96)

0.001

SOFA score

1.11 (1.04–1.17)

0.001

0.96 (0.89–1.05)

0.37

Age (yr)

1.02 (1.01–1.03)

<0.001

NEa

 

OHCA

1.77 (1.19–2.64)

0.005

1.13 (0.69–1.86)

0.62

Laboratory findings

 PaCO2 (mmHg)

1.02 (1.01–1.03)

0.001

1.00 (0.99–1.01)

0.93

 HCO3 - (mmol/L)

0.94 (0.91–0.97)

0.001

NEa

 

 Lactate (mg/dL)

1.01 (1.01–1.01)

<0.001

1.01 (1.01–1.01)

<0.001

 Platelet (x103/μL)

1.00 (0.99–1.00)

0.007

1.00 (1.00–1.00)

0.11

 pH

0.07 (0.02–0.21)

<0.001

NEb

 
  1. CI confidence interval, ECMO extracorporeal membrane oxygenation, IHCA in-hospital cardiac arrest, OHCA out-of-hospital cardiac arrest, SAVE score Survival After Veno-arterial ECMO score, SOFA score Sequential Organ Failure Assessment score,
  2. aNot entered into the multivariate analysis because age and HCO3 - are involved in SAVE score
  3. bNot entered into the multivariate analysis because of pH and lactate with high collinearity