Characteristics of OHCA emergency dispatch records of Suzhou EMS from 2014 to 2015
| All cases (n=151) | CPR performed (n=110) | CPR not performed* (n=41) | P value | |
| OHCA victims’ age (years), median (IQR) | 72 (60–82) | 72 (60–82) | 71 (60–82) | 0.88 |
| 18–34, n (%) | 6 (4.0) | 4 (3.6) | 2 (4.9) | 0.94 |
| 35–59, n (%) | 36 (23.8) | 27 (24.5) | 9 (22.0) | |
| 60–79, n (%) | 58 (38.4) | 43 (39.1) | 15 (36.6) | |
| ≥80, n (%) | 51 (33.8) | 36 (32.7) | 15 (36.6) | |
| OHCA victims’ gender, male, n (%) | 87 (57.6) | 64 (58.2) | 23 (56.1) | 0.81 |
| Callers’ gender, male, n (%) | 82 (54.3) | 59 (53.6) | 23 (56.1) | 0.79 |
| Location, n (%) | ||||
| Residence | 119 (78.8) | 87 (79.1) | 32 (78.0) | 0.89 |
| Public | 33 (21.2) | 23 (20.9) | 10 (22.0) | |
| Callers’ chief complaint to the presence of arrest, n (%)† | 0.76 | |||
| Coma/no awareness | 47 (31.1) | 34 (34) | 13 (33.3) | |
| No breathing/abnormal breathing | 34 (22.5) | 28 (28) | 6 (14.6) | |
| Almost dying | 31 (20.5) | 24 (24) | 7 (17.1) | |
| Fall/faint | 7 (4.6) | 2 (2) | 5 (12.2) | |
| Heart disease | 7 (4.6) | 5 (5) | 2 (4.9) | |
| No heartbeat/no pulse | 3 (2.0) | 3 (3) | – | |
| Shock | 4 (2.6) | 3 (3) | 1 (2.4) | |
| Death | 2 (1.3) | 1 (1) | 1 (2.4) | |
| Time of the arrest, n (%) | 0.37 | |||
| 08:00–17:59 | 70 (46.4) | 49 (44.5) | 21 (51.2) | |
| 18:00–22:59 | 31 (20.5) | 21 (19.1) | 10 (24.4) | |
| 23:00–7:59 | 50 (33.1) | 40 (36.4) | 10 (24.4) | |
| Time intervals, median (IQR) | ||||
| Time interval from collapse of the patient to the EMS call, minutes‡ | 30 (20–60) | 30 (16.5–60.0) | 30 (20–60) | 0.57 |
| Time interval from the call to dispatch recognise OHCA (s) | 46 (32.75–64.0) | 30 (25.1–43.0) | 43.25 (31.0–60.5) | <0.001 |
| Time interval from the call to provision of CPR instructions (s)§ | 115 (90–153) | 113.5 (86.5–150.75) | 130 (105.5–163.5) | <0.001 |
| Time to EMS response (min) | 16.1 (12.1–22.7) | 15.6 (11.8–23.1) | 16.4 (12.3–23.6) | 0.62 |
| Time interval from the call to the first chest compression (min) | _ | 3.7 (2.9–4.7) | _ | |
| Time interval from the call to the first ventilation (min) | _ | 9.3 (4.8–12.1) | _ | |
Expressed as mean (SD), counts (percentage) or median (IQR).
*CPR not performed include 14 cases in which CPR instruction was not given and 27 cases in which CPR instruction was given but not performed.
†Callers’ chief complaint recorded in 135 cases, refer to the question ‘tell me exactly what happened’, 100 cases in CPR performed group and 35 cases in CPR not performed group.
‡Time interval from collapse of the patient to the EMS call recorded in 118 cases, 85 in CPR performed group and 33 in CPR not performed group.
§ CPR instruction taken in 139 patients, 110 in CPR performed group and 29 in CPR not performed group.
CPR, cardiopulmonary resuscitation; EMS, emergency medical service; OHCA, out-of-hospital cardiac arrest.