Table 1. Perioperative characteristics of study population, percent or mean (95% confidence interval).
| Patient variables of interest | Total (n=109) | U-RATS (n=29) | B-RATS (n=80) | P |
|---|---|---|---|---|
| Age, years | 60.18 (58.05–62.31) | 58.93 (54.73–63.13) | 60.74 (58.23–63.25) | 0.439 |
| Patients ≥70 years | 21 (19.26%) | 6 (20.68%) | 15 (18.75%) | 0.789 |
| Sex (male) | 65 (59.63%) | 19 (65.52%) | 46 (57.75%) | 0.512 |
| BMI (kg/m2) | 24.58 (23.89–25.27) | 24.38 (23.18–25.59) | 25.31 (23.8–25.53) | 0.711 |
| Cardiovascular diseases | ||||
| Hypertension | 44 (40.36%) | 11 (37.93%) | 33 (41.25%) | 0.827 |
| Diabetes mellitus | 37 (33.94%) | 8 (27.58%) | 29 (36.25%) | 0.495 |
| Coronary artery disease | 13 (11.93%) | 4 (13.79%) | 9 (11.25%) | 0.743 |
| Smoking | 54 (49.54%) | 15 (51.72%) | 39 (48.75%) | 0.831 |
| Pulmonary function | ||||
| FEV1 | 2.48 (2.35–2.61) | 2.45 (2.22–2.67) | 2.49 (2.33–2.65) | 0.754 |
| FEV1 (% predicted) | 97.23 (93.65–100.8) | 94.46 (88.22–100.7) | 98.46 (94.02–102.9) | 0.307 |
| DLCO (% predicted) | 110.3 (105.3–115.2) | 104.1 (96.73–111.5) | 113.0 (106.6–119.4) | 0.101 |
| Gas exchange | ||||
| PaO2 (mmHg) | 88.69 (86.98–90.40) | 87.33 (84.67–89.99) | 89.30 (87.09–91.50) | 0.294 |
| PaCO2 (mmHg) | 40.64 (39.93–41.35) | 40.12 (38.95–41.29) | 40.87 (39.97–41.77) | 0.333 |
| SaO2 (%) | 97.30 (97.13–97.47) | 97.27 (96.99–97.54) | 97.31 (97.09–97.53) | 0.807 |
| Size of the lesions (cm) | 2.25 (1.98–2.52) | 2.4 (1.88–2.91) | 2.18 (1.85–2.50) | 0.455 |
| Duration of surgery (min) | 109.1 (99.9–118.2) | 124.1 (106.2–141.8) | 103.6 (93.1–114.2) | 0.049* |
| Intra-op blood loss (mL) | 140.1 (116.8–163.4) | 131.7 (86.17–177.3) | 143.1 (115.5–170.8) | 0.669 |
| Thoracic drainage (1st day) | 213.4 (183.6–243.3) | 230.9 (164.7–297.0) | 207.1 (173.4–240.9) | 0.489 |
| Blood transfusion% | 6 (5.51%) | 1 (3.44%) | 5 (6.25%) | – |
| Conversion (U-VATS) | 7 (6.42%) | 2 (6.89%) | 5 (6.25%) | – |
| Hospital length of stay (days) | 3.25 (2.93–3.58) | 3.83 (3.08–4.56) | 3.05 (2.69–3.41) | 0.037* |
*, P<0.05, compared U-RATS and B-RATS. U-RATS, uniportal robotic-assisted thoracic surgery; B-RATS, biportal-robotic-assisted thoracic surgery; BMI, body mass index; FEV, forced expiratory volume; DLCO, diffusing capacity of the lungs for carbon monoxide; U-VATS, uniportal video-assisted thoracic surgery.