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Table 1 Baseline characteristics of the patients in the overall cohort and in the propensity-matched cohort

From: An observational study of surface versus endovascular cooling techniques in cardiac arrest patients: a propensity-matched analysis

 

Baseline characteristics

After propensity matching

 

Total

Surface group

Endovascular group

P value

STDa

Total

Surface group

Endovascular group

P value

STDb

( N = 803)

( n = 559)

( n = 244)

  

( N = 360)

( n = 180)

( n = 180)

Demographic characteristics

          

 Male

561 (69.9)

391 (70.0)

170 (69.7)

0.94

−0.65

244 (67.8)

119 (66.1)

125 (69.4)

0.50

7.06

 Age (years)

56.9 ± 16.1

57.2 ± 16.1

56.0 ± 16.0

0.32

6.10

55.7 ± 16.9

56.0 ± 17.2

55.5 ± 16.6

0.78

2.40

Underlying disease

          

 Ischemic heart disease

102 (12.7)

71 (12.7)

31 (12.7)

1.00

0.00

48 (13.3)

23 (12.8)

25 (13.9)

0.76

3.23

 Cerebrovascular disease

33 (4.1)

24 (4.3)

9 (3.7)

0.69

−3.06

18 (5.0)

11 (6.1)

7 (3.9)

0.33

−10.11

 Hypertension

270 (33.6)

192 (34.4)

78 (32.0)

0.51

−5.10

119 (33.1)

61 (33.9)

58 (32.2)

0.74

−3.61

 Diabetes mellitus

180 (22.4)

118 (21.1)

62 (25.4)

0.18

10.19

86 (23.9)

44 (24.4)

42 (23.3)

0.81

−2.58

 Lung disease

51 (6.4)

37 (6.6)

14 (5.7)

0.64

−3.75

21 (5.8)

11 (6.1)

10 (5.6)

0.82

−2.13

 Renal disease

52 (6.5)

33 (5.9)

19 (7.8)

0.32

7.53

27 (7.5)

14 (7.8)

13 (7.2)

0.84

−2.28

CPR variables

          

 Witnessed

541 (67.5)

364 (65.2)

177 (72.5)

0.04

15.81

244 (67.8)

122 (67.8)

122 (67.8)

1.00

0.00

 Bystander CPR

245 (31.9)

151 (27.9)

94 (41.2)

<0.01

28.25

88 (26.8)

42 (25.6)

46 (27.9)

0.64

5.20

 Shockable rhythm

199 (24.9)

125 (22.5)

74 (30.6)

0.02

18.42

85 (23.9)

38 (21.4)

47 (26.4)

0.26

11.74

 Anoxic timec (minutes)

32.6 ± 18.4

32.8 ± 18.9

32.1 ± 17.4

0.65

3.10

32.8 ± 19.1

32.7 ± 20.1

32.9 ± 18.1

0.93

−0.84

 Cardiac cause

498 (62.0)

335 (59.9)

163 (66.8)

0.07

14.36

231 (64.2)

114 (63.3)

117 (65.0)

0.74

3.55

Variables after ROSC

          

 STEMI

73 (9.1)

48 (5.6)

25 (10.3)

0.45

5.81

27 (7.5)

14 (7.8)

13 (7.2)

0.84

−2.28

 Spontaneous breathing

325 (41.4)

196 (35.8)

129 (54.2)

<0.01

37.63

182 (51.7)

94 (53.4)

88 (50.0)

0.52

−6.81

 Motor response

135 (17.0)

83 (14.9)

52 (21.9)

0.02

18.14

71 (19.9)

37 (20.7)

34 (19.1)

0.71

−4.01

 Pupil light reflex

343 (43.4)

238 (42.9)

105 (44.7)

0.64

3.63

174 (49.7)

88 (50.0)

86 (49.4)

0.91

−1.20

Hospital variable

          

 TH volume

90.2 ± 61.5

70.4 ± 55.2

135.6 ± 50.0

<0.01

−99.46

129.4 ± 55.9

130.1 ± 58.5

128.6 ± 53.3

0.80

2.16

  1. Continuous variables are presented as the mean ± standard deviation. Parentheses indicate a percentage. CPR, cardiopulmonary resuscitation; ROSC, return of spontaneous circulation; STEMI, ST segment elevation myocardial infarction; TH, therapeutic hypothermia. aStandardized difference between the surface group and endovascular group before propensity score matching.
  2. bStandardized difference between the surface group and endovascular group after propensity score matching. cAnoxic time is the time from cardiac arrest to return of spontaneous circulation.
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