The Association of Extreme Tachycardia and Sustained Return of Spontaneous Circulation after Nontraumatic Out-of-Hospital Cardiac Arrest

Table 1

Baseline characteristics and the outcomes of the patients.

	Total	Bradycardia	Normal HR	Tachycardia	Extreme tachycardia	p
	(n = 330)	(n = 26)	(n = 67)	(n = 176)	(n = 61)
Age (years)	72 (59–79)	73 (66–77)	74 (62–79)	72 (60–79)	69 (49–76)	0.094
Male	194 (58.8)	17 (65.4)	44 (65.7)	98 (55.7)	35 (57.4)	0.470
Witnessed arrest	264 (80.0)	20 (76.9)	57 (85.1)	141 (80.1)	46 (75.4)	0.565
Public place	52 (15.8)	5 (19.2)	11 (16.4)	23 (13.1)	13 (21.3)	0.451
Shockable initial rhythm	41 (12.4)	3 (11.5)	7 (10.4)	21 (11.9)	10 (16.4)	0.757
Bystander CPR	105 (31.8)	10 (38.5)	18 (26.9)	55 (31.3)	22 (36.1)	0.611
MAP at ROSC (mmHg)	93 (68–114)	81 (43–94)	89 (67–105)	89 (68–113)	111 (85–137)	<0.001
HR at ROSC (beats/min)	120 (98–144)	47 (32–51)	84 (76–94)	124 (113–136)	161 (155–175)	<0.001
No-flow time (min)	4 (0–12)	4 (1–14)	5 (0–12)	4 (0–11)	1 (0–9)	0.194
Low-flow time (min)	26 (17–36)	37 (18–46)	27 (18–36)	25 (17–34)	24 (15–32)	0.047
Total epinephrine dose (mg)	3 (2–4)	3 (2–7)	4 (2–5)	3 (2–4)	2 (1–3)	<0.001
Sustained ROSC	281 (85.2)	18 (69.2)	54 (80.6)	149 (84.7)	60 (98.4)	0.002^‡
One-month survival	58 (17.8)	4 (15.4)	11 (16.1)	26 (15.1)	17 (27.9)	0.153
Good neurologic outcome	23 (7.0)	2 (7.7)	4 (6.0)	5 (6.0)	5 (6.0)	0.965

Data are expressed as median (interquartile range) or number (%) as appropriate. Bradycardia, HR < 60 beats/min; normal, 60 ≤ HR ≤ 100 beats/min; tachycardia, 100 < HR < 150 beats/min; extreme tachycardia, HR ≥ 150 beats/min; HR, heart rate; CPR, cardiopulmonary resuscitation; MAP, mean arterial pressure; ROSC, return of spontaneous circulation. Statistically significant after Bonferroni correction. Statistically not significant after Bonferroni correction. Statistically significant.