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Table 1 Baseline characteristics

From: The influence of timing of coronary angiography on acute kidney injury in out-of-hospital cardiac arrest patients: a retrospective cohort study

Characteristics All patients (N = 2375) Early CAG (N = 1148) Deferred/no CAG (N = 1227) P value
Patient characteristics
 Male sex 1652 (69.6) 791 (47.9) 861 (52.1) 0.50
 Age in years 63.3 ± 13.8 62.7 ± 12.5 64.0 ± 14.9 0.02
 Hypertension 839/2041 (41.1) 411/966 (42.5) 428/1075 (39.8) 0.21
 Diabetes mellitus 379/2219 (17.1) 180/1109 (16.2) 199/1110 (17.9) 0.29
 Hypercholesterolemia 288/1211 (23.8) 128/530 (24.2) 160/681 (23.5) 0.88
 Previous cardiac arrest 21/1003 (2.1) 9/577 (1.6) 12/426 (2.8) 0.17
 Previous myocardial infarction 495/2189 (22.6) 231/1100 (21.0) 264/1089 (24.2) 0.07
 Previous CVA or TIA 43/690 (6.2) 24/357 (6.7) 19/333 (5.7) 0.64
 Chronic kidney disease 69/1141 (6.0) 20/586 (3.4) 49/555 (8.8) < 0.001
 Previous renal replacement therapy 15/1009 (1.5) 7/579 (1.2) 8/430 (1.9) 0.40
Pre-hospital characteristics
 Arrest witnessed 981/1227 (80.0) 495/608 (81.4) 486/619 (78.5) 0.20
 First rhythm < 0.001
  VF/VT 1009/1193 (84.6) 572/614 (93.2) 437/579 (75.5)  
  PEA 57/1193 (4.8) 12/614 (2.0) 45/579 (7.8)  
  Asystole 127/1193 (10.6) 30/614 (4.9) 97/579 (16.8)  
 Time from arrest to BLS in minutes 3 [1–5] 3 [1–5] 3 [1–5] 0.40
 Time from arrest to ROSC in minutes 15 [10–23] 15 [10–23] 15 [10–23] 0.69
Characteristics on hospital arrival
 Glasgow Coma Scale < 8 1374/1533 (89.6) 639/735 (86.9) 735/798 (92.1) 0.001
 Signs of STEMI on ECG 543/1965 (27.6) 410/969 (42.3) 133/996 (13.4) < 0.001
 CT scan performed 320/751 (57.4) 205/378 (54.2) 115/373 (30.8) < 0.001
Laboratory values upon admission
 pH 7.2 [7.1–7.3] 7.2 [7.1–7.3] 7.2 [7.1–7.3] 0.05
 Lactate, mmol/L 5.9 [3.5–9.1] 5.5 [3.5–8.8] 6.2 [3.7–9.4] 0.01
 Hemoglobin, mmol/L 8.4 ± 1.3 8.5 ± 1.2 8.3 ± 1.3 0.001
 Hematocrit 0.40 ± 0.06 0.41 ± 0.1 0.39 ± 0.1 0.001
 Leukocytes, ·109/L 12.5 [9.8–16.7] 12.6 [10.0–17.0] 12.2 [9.4–16.1] 0.07
 CRP, mg/L 5 [3–17] 4 [3–16] 5 [3–19] 0.15
 Creatinine, µmol/L 98 [82–117] 96 [81–114] 100 [82–120] 0.001
 Creatinine > 130 µmol/L 366/2342 (15.6) 148/1134 (12.9) 218/1208 (17.8) 0.001
  1. All data are expressed in proportions of the population with known data and percentages (%). Plus–minus (±) values are classified as mean and standard deviation (SD). Brackets are classified as median and interquartile ranges (IQR)
  2. CAG coronary angiography, CVA cerebrovascular accident, TIA transient ischemic attack, VF ventricular fibrillation, VT ventricular tachycardia, PEA pulseless electrical activity, BLS basic life support, ROSC return of spontaneous circulation, STEMI ST-segment elevation myocardial infarction, CT computed tomography, CRP C-reactive protein