Table 1.
Comparison Between Bispectral Index (BIS) and End-Tidal Anesthetic Concentration (ETAC) Groups
| BIS (149 patients) | ETAC (161 patients) | P value | ||
|---|---|---|---|---|
| Age | 62±14 | 61±14 | 0.55 (2) | |
| Sex | Male | 93 | 101 | 0.95(1) |
| Female | 56 | 60 | ||
| Race | Caucasian | 122 | 132 | |
| African-American | 18 | 20 | 0.98 (1) | |
| Other/Unknown | 9 | 9 | ||
| Alive at last follow-up | 132 | 137 | 0.36 (1) | |
| Duration of surgery (minutes) | 311±88 | 319±92 | 0.43 (2) | |
| Surgery with CPB | 119 | 126 | 0.73 (1) | |
| ICU length of stay (days) | 3 (1-6) | 4 (2-8) | 0.006 (3) | |
| Hospital length of stay (days) | 8 (6-13) | 9 (5-16) | 0.36 (3) | |
| Proportion of intraoperative time with BIS <20 | 0 (0 – 0.036) | 0 (0 – 0.024) | 0.88 (3) | |
| Ever experienced BIS<20 | 64 (43.0%) | 69 (42.9%) | 0.99 (1) | |
| Type of surgery | CABG only | 40 | 38 | 0.89 (1) |
| >1 of CABG, valve, Maze | 13 | 17 | ||
| Aortic aneurysm | 19 | 21 | ||
| Valve only | 39 | 37 | ||
| Other cardiac | 22 | 25 | ||
| Thoracic | 16 | 23 | ||
(1)
Chi square.
(2)
T-test.
(3)
Mann-Whitney U test.
Parametric data presented as mean ± standard deviation, nonparametric as median (interquartile range).
CPB, cardiopulmonary bypass. ETAC, end-tidal anesthetic concentration. ICU, intensive care unit