Table 1.

Comparison of baseline characteristics between survivors and non‐survivors among Japanese patients with coma after cardiac arrest (n = 46)

	Total (n = 46)	Survivors (n = 33)	Non‐survivors (n = 13)	P‐value
Age, years	62.0 (48.5–71.3)	59.0 (39.0–71.0)	64.0 (60.5–73.0)	0.113
Sex, male	38 (83)	26 (79)	11 (85)	0.182
BMI	22.2 (18.4–24.2)	21.7 (17.9–23.5)	23.2 (20.2–28.1)	0.054
Initial rhythm of VT/VF	26 (57)	19 (58)	7 (54)	0.818
Time from collapse to ROSC, min	30.5 (18.0–50.0)	24.0 (14.0–45.0)	47.5 (28.3–57.0)	0.018
Witnessed cardiac arrest	43 (94)	30 (91)	13 (100)	0.261
Adrenaline dose at resuscitation, mg	3 (0.0–4.0)	1 (0.0–3.5)	4 (3.0–5.0)	0.004
Provision of defibrillation	25 (54)	19 (58)	6 (46)	0.484
Prehospital ROSC	14 (30)	13 (39)	1 (8)	0.035
In‐hospital cardiac arrest	11 (24)	6 (18)	5 (38)	0.147
Bystander CPR	19 (41)	23 (70)	5 (38)	0.051
Cardiac origin of arrest	32 (70)	23 (70)	9 (69)	0.975
Coronary disease	15 (33)	9 (27)	6 (46)	0.206
CAI
Day 1	5.00 (2.00–12.48)	5.00 (1.00–12.00)	8.00 (2.00–21.25)	0.087
Day 2	4.50 (1.23–9.25)	3.70 (5.00–8.00)	6.00 (2.50–12.50)	0.053
Day 3	3.00 (0.25–8.00)	2.50 (0.00–7.50)	8.00 (1.50–8.00)	0.053
Day 4	2.00 (0.00–5.63)	2.00 (0.00–5.00)	4.00 (0.00–8.00)	0.269
Day 5	1.10 (0.00–4.13)	0.00 (0.00–3.00)	4.00 (0.00–11.50)	0.025
Day 6	0.00 (0.00–3.00)	0.00 (0.00–1.65)	3.00 (0.00–9.50)	0.022

Data are shown as median (range) or n (%).

Catecholamine index (CAI) = hourly doses (μg/kg/min) of dopamine + dobutamine + (adrenaline + noradrenaline) × 100 (μg/kg/min).

CAI of each day was calculated at the highest point of the day.

BMI, body mass index; CPR, cardiopulmonary resuscitation; ROSC, return of spontaneous circulation; VF, ventricular fibrillation; VT, ventricular tachycardia.