Table 2 Event characteristics by survival to hospital discharge (Enrolled Index Events)

Characteristics of cardiac arrest event

Location of CPR Event

0.734^b

 PICU

10 (16%)

4 (13%)

6 (18%)

 CICU

54 (84%)

27 (87%)

27 (82%)

CPR time^a

1.000^b

 Weekday

35 (55%)

17 (55%)

18 (55%)

 Weeknight

12 (19%)

6 (19%)

6 (18%)

 Weekend

17 (27%)

8 (26%)

9 (27%)

First documented rhythm

0.563^b

 Pulseless electrical activity / asystole

21 (33%)

9 (29%)

12 (36%)

 Ventricular fibrillation / tachycardia

4 (6%)

3 (10%)

1 (3%)

 Bradycardia with poor perfusion

38 (59%)

19 (61%)

19 (58%)

 Unknown

1 (2%)

0 (0%)

1 (3%)

 Duration of CPR (minutes)

6.5 [2.0,30.0]

6.0 [2.0,14.0]

8.0 [2.0,33.0]

0.402^c

Duration of CPR (minutes)

0.071^b

 <6

29 (45%)

15 (48%)

14 (42%)

 6–15

12 (19%)

9 (29%)

3 (9%)

 16–35

10 (16%)

2 (7%)

8 (24%)

 >35

13 (20%)

5 (16%)

8 (24%)

 Sternum open at start of CPR event

9 (14%)

3 (10%)

6 (18%)

0.476^b

 Sternum opened during CPR event

3 (5%)

1 (3%)

2 (6%)

1.000^b

 Minutes to sternum opening

22.5 [18.0,27.0]

18.0 [18.0,18.0]

27.0 [27.0,27.0]

 Days since last cardiac surgery

18.0 [2.0,387.0]

18.0 [2.0,387.0]

20.5 [9.5,983.5]

0.377^c

Immediate cause(s) of event

 Arrhythmia

9 (14%)

5 (16%)

4 (12%)

0.729^b

 Cyanosis without respiratory decompensation

3 (5%)

2 (7%)

1 (3%)

0.607^b

 Hypotension as immediate cause of event

37 (58%)

16 (52%)

21 (64%)

0.448^b

 Respiratory decompensation

38 (59%)

19 (61%)

19 (58%)

0.803^b

Pharmacologic interventions during arrest

 Epinephrine

58 (91%)

29 (94%)

29 (88%)

0.673^b

 Number of doses

2.0 [1.0,5.0]

2.0 [1.0,2.0]

3.0 [2.0,7.0]

0.021^c

 Atropine

6 (9%)

2 (7%)

4 (12%)

0.673^b

 Calcium

29 (45%)

12 (39%)

17 (52%)

0.327^b

 Sodium bicarbonate

32 (50%)

12 (39%)

20 (61%)

0.133^b

 Vasopressin

5 (8%)

1 (3%)

4 (12%)

0.356^b

 Amiodarone

6 (9%)

1 (3%)

5 (15%)

0.198^b

 Lidocaine

1 (2%)

0 (0%)

1 (3%)

1.000^b

 Fluid bolus

15 (23%)

6 (19%)

9 (27%)

0.560^b