Table 2.

Patient characteristics of dialysis unit cardiac arrests according to whether AED use was initiated by dialysis staff

CharacteristicEMS/First Responder First Application of AED, n=188Bystander Dialysis Staff–Initiated Application of AED, n=208P Value
Demographics
 Mean age (SD)64.2 (12.8)64.2 (11.6)0.86
 Women100 of 188 (53)93 of 208 (44)0.09
 Race0.25
  White60 of 188 (32)59 of 208 (28)
  Black102 of 188 (54)128 of 208 (62)
  Other7 of 188 (4)8 of 208 (4)
  Missing data19 of 188 (10)13 of 208 (6)
Cardiac arrest characteristics
 Witnessed arrest159 of 188 (85)181 of 208 (87)0.58
 First monitored rhythm0.001a
  Shockable rhythm47 of 188 (25)85 of 208 (41)
   Ventricular fibrillation31 of 188 (16)21 of 208 (10)
   Ventricular tachycardia3 of 188 (2)1 of 208 (0)
   Unknown shockable rhythm13 of 188 (7)63 of 208 (31)
  Nonshockable rhythm140 of 188 (75)123 of 208 (69)
   Asystole40 of 188 (21)26 of 208 (12)
   Idioventricular/PEA57 of 188 (30)48 of 208 (23)
   Unknown nonshockable rhythm43 of 188 (23)49 of 208 (23)
   Missing1 of 188 (1)0 of 208 (0)
CPR characteristics
 CPR first initiated by<0.001
  EMS/first responder61 of 188 (32)13 of 208 (6)
  Dialysis staff bystander127 of 188 (68)195 of 208 (94)
 AED shock delivered72 of 188 (38)112 of 208 (54)0.002
  Missing data1 of 188 (1)0 of 208 (0)
 First AED shock delivered by<0.001
  EMS/first responder64 of 188 (34)20 of 208 (10)
  HD staff0 of 188 (0)88 of 208 (43)
  Missing data8 of 188 (4)4 of 208 (2)
Dialysis clinic characteristics
 Dialysis ownership0.43
  Nonprofit nonchain4 of 188 (2)5 of 208 (2)
  Nonprofit chain15 of 188 (8)15 of 208 (8)
  Profit nonchain13 of 188 (7)7 of 208 (3)
  Profit chain156 of 188 (83)181 of 208 (87)
 Clinic Medicare star rating<0.01
  1–230 of 188 (16)32 of 208 (15)
  379 of 188 (42)119 of 208 (57)
  4–573 of 188 (39)55 of 208 (26)
  Missing data6 of 188 (3)2 of 208 (1)
 Clinic location
  Atlanta metropolitan area88 of 188 (47)58 of 208 (28)<0.001
  NC100 of 188 (53)150 of 208 (72)
  Mean number of dialysis chairs (SD)23.4 (8.4)29.1 (11.5)<0.001
Post–cardiac arrest outcomes
 Return of spontaneous circulation85 of 188 (45)108 of 208 (52)0.18
  Missing data0 of 188 (0)0 of 208 (0)
 Survival to hospital admission89 of 188 (47)103 of 208 (50)0.57
  Missing data1 of 188 (1)4 of 208 (2)
 Overall Survival to hospital discharge42 of 188 (22)62 of 208 (30)0.08
  Missing data1 of 188 (1)4 of 208 (2)
 Cerebral performance category score >2 at discharge36 of 188 (19)50 of 208 (24)0.23
  Missing data1 of 188 (1)2 of 208 (1)
  • Data are provided as n (%), except where indicated otherwise. PEA, pulseless electrical activity; HD, hemodialysis; NC, North Carolina.

  • a P value is for comparison of shockable versus nonshockable rhythms.