Table 1.
Prehospital characteristics of the study populationa
| Characteristics | Overall population | Group 1 (< 45 yr) | Group 2 (45 to 54 yr) | Group 3 (55 to 64 yr) | Group 4 (65 to 74 yr) | Group 5 (≥75 yr) |
|---|---|---|---|---|---|---|
| (N = 111) | (n = 22) | (n = 27) | (n = 22) | (n = 23) | (n = 17) | |
| Age, yr* | 58 [47 to 70] | 40 [36 to 43] | 50 [47 to 52] | 59 [58 to 61] | 70 [67 to 72] | 78 [76 to 83] |
| Males, n (%) | 87 (78) | 20 (91) | 22 (81) | 19 (86) | 16 (70) | 10 (59) |
| Medical history, n (%) | ||||||
| Hypertension* | 46 (41) | 3 (14) | 10 (37) | 8 (36) | 15 (65) | 9 (53) |
| CHD* | 27 (24) | 2 (9) | 4 (15) | 3 (14) | 10 (44) | 8 (47) |
| NYHA classification III or IV* | 29 (26) | 1 (5) | 5 (19) | 5 (23) | 12 (52) | 6 (35) |
| Location of cardiac arrest* | ||||||
| Home, n (%) | 43 (39) | 8 (36) | 8 (30) | 5 (24) | 11 (48) | 11 (65) |
| Workplace, n (%) | 18 (16) | 4 (18) | 12 (44) | 2 (10) | 0 | 0 |
| Public place, n (%) | 50 (45) | 10 (45) | 7 (26) | 15 (67) | 12 (52) | 6 (35) |
| No-flow duration, minutes | 5 [1 to 10] | 4 [1 to 8] | 5 [1 to 10] | 5 [1 to 10] | 5 [1 to 10] | 6 [1 to 10] |
| Time to ROSC, minutes | 30 [16 to 45] | 27 [14 to 44] | 33 [19 to 48] | 21 [19 to 50] | 32 [16 to 45] | 31 [19 to 41] |
| Epinephrine dose, mg | 2 [0 to 8] | 1.5 [0 to 7.5] | 5 [0 to 10.5] | 2 [0 to 5] | 2 [0 to 4.5] | 3 [0 to 6.25] |
| ECG, n (%) | ||||||
| ST elevation | 50 (45) | 9 (41) | 16 (59) | 11 (50) | 6 (26) | 8 (47) |
| LBBB | 10 (9) | 0 | 2 (7) | 3 (14) | 4 (17) | 1 (7) |
aCHD: coronary heart disease; NYHA: New York Heart Association; ROSC: return of spontaneous circulation; epinephrine dose: cumulative dose of epinephrine required during initial resuscitation; ECG: electrocardiogram; LBBB: left bundle branch block. *P < 0.05 between-group comparisons. Numbers between brackets are percentages or 25th to 75th percentiles.