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Table 3 Linear association among pCO2 and serum electrolytes in groups of patients according to ABG analysis values and in the entire cohort

From: Acid–base balance, serum electrolytes and need for non-invasive ventilation in patients with hypercapnic acute exacerbation of chronic obstructive pulmonary disease admitted to an internal medicine ward

Variables

 

Mixed respiratory acidosis – metabolic alkalosis (N = 36)

Compensated respiratory acidosis (N = 51)

Mixed respiratory - metabolic acidosis (N = 23)

Hypercapnic COPD, entire group (N = 110)

Na+

R2

0.10

0.01

0.16

0.002

Slope

0.67

1.06

−1.33

−0.02

p

0.06

0.03

0.06

0,62

K+

R2

0.001

−0.02

−0.001

0.003

Slope

−1.53

−0.66

−8.08

1.45

p

0.58

0,84

0.33

0.58

HCO3

R2

0.84

0.90

0.49

0.24

Slope

1.26

2.18

2.20

1.14

p

0.001

0.001

0.001

0.001

Cl

R2

0.30

0.32

0.21

0.20

Slope

−1.28

−1.45

−1.24

−1.37

p

0.001

0.001

0.04

0.001

Anion Gap

R2

0.20

0.11

0.08

0.04

Slope

−0.71

−1.39

−0.82

−0.67

p

0.006

0.01

0.23

0.03

Lactate

R2

0.10

0.02

0.01

0.01

Slope

−5.54

−3.42

−0.95

1.58

p

0.06

0.30

0.65

0.25