Table 3.
Comparison of demographic data, intraoperative haemodynamic characteristics, estimated blood loss, and needs for blood transfusion between patients using different blood pressure monitoring techniques
| Total bimax | IABP | NIBP | P |
|---|---|---|---|
| (269) | (119) | (150) | |
| Sex | 0.282 | ||
| Male | 62 (52.1%) | 88 (58.7%) | |
| Female | 57 (47.9%) | 62 (41.3%) | |
| Age (yr) | 23.5±4.7 | 23.6±5.2 | 0.813 |
| Weight (kg) | 61.7±12.7 | 62.3±10.8 | 0.658 |
| BMI | 21.8±3.4 | 22.0±3.2 | 0.609 |
| ASA | 0.178 | ||
| I | 82 (68.9%) | 113 (75.3%) | |
| II | 35 (29.4%) | 37 (24.7%) | |
| III | 2 (1.7%) | 0 (0.0%) | |
| Surgery duration (min) | 376.3±87.4 | 371.3±104.2 | 0.667 |
| Anaesthesia methods | 0.238 | ||
| TIVA | 16 (13.4%) | 14 (9.3%) | |
| VA w. remifentanil | 102 (85.7%) | 131 (87.3%) | |
| VA only | 1 (0.8%) | 5 (3.3%) | |
| Hypotensive anaesthesia (Average MAP<60 mmHg) achieved | 23 (19.3%) | 25 (16.7%) | 0.06 |
| <49.9 | 0 | 0 | |
| 50-54.9 | 1 | 2 | |
| 55-59.9 | 22 | 23 | |
| 60-64.9 | 50 | 60 | |
| 65-69.9 | 29 | 52 | |
| 70-74.9 | 11 | 12 | |
| 75-79.9 | 4 | 1 | |
| >80 | 2 | 0 | |
| Hypotensive technique | |||
| GTN | 7 (5.9%) | 3 (2.0%) | 0.113 |
| Beta-blocker | 56 (47.5%) | 39 (26.0%) | 0 |
| Hydralazine | 8 (6.7%) | 7 (4.7%) | 0.594 |
| Pulse rate (per min) | 76.3±8.3 | 77.0±9.7 | 0.484 |
| Preop Hb (g/dL) | 13.8±1.6 | 14.0±1.4 | 0.213 |
| Postop Hb (g/dL) | 11.6±1.6 | 11.6±1.4 | 0.817 |
| IV. Fluids (mL) | 2595.8±813.9 | 2685.3±924.9 | 0.400 |
| EBL (mL) | 911.7±486.0 | 1029.2±488.7 | 0.050 |
| No. who required transfusion | 77 (64.7%) | 92 (61.3%) | 0.612 |
| Autologous blood transfusion | 60 (50.4%) | 73 (48.7%) | 0.775 |
| Volume of transfusion (mL) | 307.2±277.8 | 320.6±312.7 | 0.710 |
| Length of hospital stay (h) | 62.8±15.1 | 61.5±15.7 | 0.505 |
* TIVA - total intravenous anesthesia, VA - inhalational anesthesia, BMI - body mass index, ASA - American Society of Anesthesiologists (ASA) physical status classification system, GTN - glyceryltrinitrate, SBP - systolic blood pressure, DBP - diastolic blood pressure, Hb - haemoglobin, EBL - estimated blood loss, Bimax - bimaxillary surgery, preop-preoperative, postop-postoperative, IABP-intraarterial blood pressure, NIBP-non invasive blood pressure. Data presented as mean±standard deviation (SD) or number (proportion). P<0.05 means statistically significant