Introduction
Methods
Patient and data collection
All (n = 100) | Continuous CO2 (n = 50) | One-shot CO2 (n = 50) | P-value | |
---|---|---|---|---|
Age (years) | 66 (62–76) | 65 (62–78) | 69 (67–79) | < 0.001 |
Male sex | 52.5% | 43.9% | 38.7% | < 0.001 |
Body mass index (kg/m2) | 25.8 (22.2–28.8) | 26.8 (23.4–29.0) | 24.3 (21.7–28.4) | 0.191 |
Arterial hypertension | 32.2% | 33.3% | 36.1% | 0.789 |
Diabetes mellitus | ||||
Oral antidiabetic drugs | 8.9% | 7.2% | 5.5% | 0.006 |
Insulin | 2.3% | 2.8% | 2.6% | 0.530 |
Hypercholesterolemia | 77.4% | 38.1% | 39.3% | 0.899 |
Renal dysfunction* | 1.4% | 2.3% | 2.1% | 0.254 |
Respiratory or lung disease | 2.1% | 2.3% | 1.9% | 0.187 |
Previous disabling stroke | 1.5% | 1.5% | 1.3% | 0.687 |
History of cancer | 1.4% | 1.9% | 2.5% | 0.030 |
Atrial fibrillation | 9.4% | 8.3% | 11.2% | < 0.001 |
Peripheral vascular disease | 1.8% | 1.6% | 1.9% | 0.556 |
Coronary artery disease | 0.9% | 0.8% | 1.1% | 0.81 |
LVEF | 0.347 | |||
>50% | 93.0% | 92.0% | 91.2% | |
30–50% | 6.3% | 7.5% | 7.5% | |
<30% | 0.7% | 0.5% | 1.3% | |
Previous surgery | 2.3% | 1.7% | 1.9% | 0.211 |
EuroSCORE II (%) | 1.2 (1.1–2.8) | 1.2 (1.1–2.7) | 1.2 (1.1–2.8) | 0.87 |
Surgical technique
CO2 insufflation management and CPB de-airing
Statistical analysis
Results
Continuous CO2 (n = 50) | One-shot CO2 (n = 50) | P-value | |
---|---|---|---|
Cardiopulmonary bypass time (min) | 79 (65–85) | 74 (63–79) | 0.98 |
Cross-clamp time (min) | 41 (37–45) | 43 (36–47) | 0.89 |
Mitral valve pathology | Right thoracotomy (n = 100) | Continuous CO2 (n = 50) | One-shot CO2 (n = 50) |
---|---|---|---|
Degenerative | 60 (60%) | 26 (52%) | 34 (68%) |
Functional | 28 (28%) | 17 (34%) | 11 (22%) |
Rheumatic | 12 (12%) | 7 (14%) | 5 (10%) |
Time period/area of interest | No. of microemboli | P-value | |
---|---|---|---|
Continuous CO
2
(n = 50)
|
One-shot CO
2
(n = 50)
| ||
From release of cross-clamp until 20 min after end of CPB | |||
LA | 59 (43–79) | 98 (39–129) | < 0.001 |
LV | 49 (45–74) | 87 (59–112) | < 0.001 |
Ao | 42 (34–58) | 76 (32–88) | < 0.001 |
LA + LV + Ao | 154 (84–195) | 261(146–299) | < 0.001 |
First 15 min after release of cross-clamp | |||
LA | 46 (38–96) | 139 (99–159) | < 0.01 |
LV | 65 (58–93) | 96 (81–109) | < 0.001 |
Ao | 25 (19–39) | 75 (42–89) | < 0.001 |
LA + LV + Ao | 113 (86–157) | 310(290–343) | < 0.001 |
Last 10 min of CPB | |||
LA | 17 (11–43) | 27 (9–41) | < 0.01 |
LV | 19 (11–29) | 48 (9–59) | < 0.001 |
Ao | 16 (12–37) | 36 (25–56) | < 0.01 |
LA + LV + Ao | 52 (42–87) | 141(122–156) | < 0.001 |
First 20 min after end of CPB | |||
LA | 8 (4–21) | 48 (19–54) | < 0.01 |
LV | 13 (5–25) | 34 (15–41) | 0.01 |
Ao | 16 (8–28) | 83 (68–98) | < 0.01 |
LA + LV + Ao | 37 (27–58) | 165(120–197) | < 0.01 |
Continuous CO2 (n = 50) | One-shot CO2 (n = 50) | P-value | |
---|---|---|---|
Microemboli after CPB fell to zero (min) | 9 ± 5 | 19 ± 3 | 0.01 |
Agitation at anesthesia discontinuation (no. of patients) | 1 | 9 | 0.022 |
Mechanical ventilation (h) | 14 ± 3 | 27 ± 4 | 0.016 |
ICU length of stay (h) | 33 ± 4 | 42 ± 5 | 0.029 |