Table 2. Comparison of respiratory and hemodynamic parameters at each time point between the two groups [n=30, M (P25–P75)].
| Indicator | Group | T0 | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|---|---|
| TV (mL) | SV | – | 412 [400–454] | 310 [300–372]c | 200 [180–225]bc | 285 [155–388]bc | 312 [179–417]c | 443 [335–453] |
| MV | – | 439 [394–450] | 350 [324–375]c | 350 [296–353]c | 350 [300–369]c | 350 [300–360]c | 450 [425–450] | |
| RR (beats/min) | SV | – | 13 [12–14] | 12 [10–14]b | 12 [8–16] | 11 [7–14]b | 11 [8–15]b | 14 [11–16] |
| MV | – | 14 [12–15] | 14 [12–15] | 14 [12–15] | 14 [12–15] | 14 [12–15] | 14 [12–15] | |
| MV (mL/min) | SV | – | 5,765 [4,875–6,300] | 3,900 [3,397–4,500]bc | 2,400 [1,580–3,438]bc | 2,365 [1,600–4,506]bc | 3,330 [2,195–4,624]bc | 5,613 [3,998–6,750] |
| MV | – | 5,400 [4,937–6,750] | 4,550 [4,200–5,250]c | 4,500 [4,089–5,250]c | 4,550 [4,103–5,250]c | 4,655 [4,132–5,250]c | 6,080 [5,100–6,750] | |
| HR (times/min) | SV | 77 [72–81] | 70 [60–81] | 65 [57–79]a | 72 [65–84] | 76 [69–80]b | 77 [70–85]b | 77 [68–84]b |
| MV | 72 [66–78] | 69 [66–73] | 66 [56–71]a | 67 [63–75] | 68 [62–73] | 66 [61–75] | 63 [55–71]a | |
| SBP (mmHg) | SV | 134 [122–155] | 113 [104–127]a | 110 [101–126]a | 101 [93–122]ab | 95 [89–107]a | 104 [93–119]a | 118 [107–132] |
| MV | 146 [131–161] | 119 [109–125]a | 115 [109–129]a | 115 [99–130]a | 102 [90–119]a | 102 [90–112]a | 112 [103–121]a | |
| DBP (mmHg) | SV | 79 [72–85] | 71 [64–79] | 70 [64–75] | 62 [59–70]a | 58 [53–65]a | 65 [55–70]a | 69 [63–80] |
| MV | 83 [74–90] | 68 [62–74]a | 68 [63–80]a | 67 [54–76]a | 61 [53–68]a | 61 [54–71]a | 67 [59–75]a | |
| MAP (mmHg) | SV | 99 [89–108] | 83 [77–93] | 83 [77–95] | 74 [69–83]ab | 71 [65–78]a | 77 [69–85]a | 86 [79–96] |
| MV | 103 [91–114] | 83 [80–92]a | 84 [78–96]a | 82 [70–94]a | 73 [64–85]a | 75 [66–89]a | 82 [75–90]a | |
| SpO2 (%) | SV | 96 [95–97] | 100 [100–100]a | 100 [100–100]ab | 100 [100–100]ab | 100 [100–100]ab | 100 [99–100]a | 100 [100–100]a |
| MV | 96 [95–98] | 100 [100–100]a | 100 [99–100]a | 100 [96–100] | 98 [95–100] | 100 [96–100] | 100 [100–100]a |
a, P<0.05, compared to T0; b, P<0.05, compared to group MV; c, P<0.05, compared to T1. SV group, spontaneous ventilation group; MV group, mechanical ventilation group; TV, tidal volume; RR, respiratory rate; MV, minute ventilation; HR, heart rate; SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; SpO2, pulse oxygen saturation; T0, preoperative; T1, anesthesia induction intubation; T2, beginning of operation; T3, 15 min after the operation began; T4, 30 min after the operation began; T5, 45 min after the operation began; T6, the end of operation.