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Table 2 Patient characteristics in the matched cohort

From: In-hospital extracorporeal cardiopulmonary resuscitation for patients with out-of-hospital cardiac arrest: an analysis by time-dependent propensity score matching using a nationwide database in Japan

 

Initial shockable rhythm

Initial non-shockable rhythm

Characteristics

ECPR (N = 913)

Control (N = 913)

SMD

ECPR (N = 370)

Control (N = 370)

SMD

Sex (men)

784 (86%)

778 (85%)

0.02

284 (77%)

278 (75%)

0.04

Age

59 (48, 68)

59 (48, 70)

− 0.04

60 (47, 69)

58 (45, 69)

0.08

Witnessed

714 (78%)

717 (79%)

− 0.01

285 (77%)

296 (80%)

− 0.07

Bystander CPR

506 (55%)

510 (56%)

− 0.01

160 (43%)

178 (48%)

− 0.10

Initial cardiac rhythm

  

0.00

  

0.01

 Initial VF/VT

913 (100%)

913 (100%)

 

–

–

 

 PEA

–

–

–

237 (64%)

239 (65%)

 

 Asystole

–

–

–

133 (36%)

131 (35%)

 

Bystander AED

77 (8.4%)

74 (8.1%)

0.01

20 (5.4%)

20 (5.4%)

0.00

Physician-staffed heli/ ambulance

237 (26%)

246 (27%)

− 0.02

86 (23%)

105 (28%)

− 0.12

Shock by paramedic

907 (99%)

896 (98%)

0.11

133 (36%)

114 (31%)

0.11

Advanced airway

  

0.08

  

0.09

 Intubation

121 (13%)

126 (14%)

 

35 (9.5%)

41 (11%)

 

 None

349 (38%)

379 (42%)

 

151 (41%)

160 (43%)

 

 SGA

443 (49%)

408 (45%)

 

184 (50%)

169 (46%)

 

Number of IV adrenaline

  

0.02

  

− 0.05

 0

533 (58%)

538 (59%)

 

226 (61%)

212 (57%)

 

 1

121 (13%)

135 (15%)

 

38 (10%)

56 (15%)

 

 2

99 (11%)

93 (10%)

 

44 (12%)

48 (13%)

 

 3

91 (10.0%)

72 (7.9%)

 

36 (9.7%)

22 (5.9%)

 

 4

33 (3.6%)

34 (3.7%)

 

21 (5.7%)

10 (2.7%)

 

 ≥ 5

36 (3.9%)

41 (4.5%)

 

5 (1.4%)

22 (5.9%)

 

Pre-hospital ROSC

70 (7.7%)

67 (7.3%)

0.01

30 (8.1%)

25 (6.8%)

0.05

Time from call to hospital

31 (26, 39)

31 (25, 38)

0.06

33 (27, 40)

34 (27, 41)

− 0.03

Initial cardiac rhythm on arrival

  

0.09

  

0.11

 Asystole

151 (17%)

133 (15%)

 

110 (30%)

104 (28%)

 

 PEA

162 (18%)

143 (16%)

 

169 (46%)

188 (51%)

 

 VF/VT

600 (66%)

637 (70%)

 

91 (25%)

78 (21%)

 

Shock in hospital

472 (52%)

551 (60%)

− 0.17

133 (36%)

133 (36%)

0.00

Adrenaline in hospital

776 (85%)

838 (92%)

− 0.21

332 (90%)

346 (94%)

− 0.14

Intubation in hospital

711 (78%)

761 (83%)

− 0.14

303 (82%)

323 (87%)

− 0.15

ECPR case volume

  

0.12

  

0.19

 High volume

668 (73%)

664 (73%)

 

269 (73%)

277 (75%)

 

 Middle volume

202 (22%)

181 (20%)

 

85 (23%)

64 (17%)

 

 Low volume

43 (4.7%)

68 (7.4%)

 

16 (4.3%)

29 (7.8%)

 
  1. Continuous variables are expressed as medians and interquartile ranges, and categorical variables are expressed as numbers and percentages (%)
  2. SMD, standardized mean difference. ECPR, Extracorporeal cardiopulmonary resuscitation; CPR, Cardiopulmonary resuscitation; VF, Ventricular fibrillation; VT, Ventricular tachycardia; PEA: Pulseless electrical activity; ROSC, Return of spontaneous circulation; AED, Automated external defibrillator; SGA, Supraglottic airway; IV, intravenous. Variables were included in the model to generate propensity scores
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