Individualized positive end-expiratory pressure following alveolar recruitment manoeuvres in lung-healthy anaesthetized dogs: a randomized clinical trial on early postoperative arterial oxygenation

被引:4
作者
Garcia-Sanz, Virginia [1 ]
Aguado, Delia [1 ]
Gomez de Segura, Ignacio A. [1 ]
Canfran, Susana [1 ]
机构
[1] Univ Complutense Madrid, Vet Teaching Hosp, Vet Fac, Dept Anim Med & Surg, Avda Puerta de Hierro S-N, Madrid 28040, Spain
关键词
anaesthesia; arterial oxygenation; controlled mechanical ventilation; dog; postoperative period; recruitment manoeuvre; LOW-TIDAL-VOLUME; INSPIRED OXYGEN; GENERAL-ANESTHESIA; GAS-EXCHANGE; MECHANICAL VENTILATION; ATELECTASIS; FRACTIONS; SURGERY; MULTICENTER; HYPOXEMIA;
D O I
10.1016/j.vaa.2021.03.019
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Objective To assess and compare the effect of intraoperative stepwise alveolar recruitment manoeuvres (ARMs), followed by individualized positive end-expiratory pressure (PEEP), defined as PEEP at maximal respiratory system compliance + 2 cmH(2)O (PUPmaxCrs+2), with that of spontaneous ventilation (SV) and controlled mechanical ventilation (CMV) without ARM or PEEP on early postoperative arterial oxygenation in anaesthetized healthy dogs. Study design Prospective, randomized, nonblinded clinical study. Animals A total of 32 healthy client-owned dogs undergoing surgery in dorsal recumbency. Methods Dogs were ventilated intraoperatively (inspired oxygen fraction: 0.5) with one of the following strategies: SV, CMV alone, and CMV with PEEPmaxCrs+2 following a single ARM (ARM1) or two ARMs (ARM2, the second ARM at the end of surgery). Arterial blood gas analyses were performed before starting the ventilatory strategy, at the end of surgery, and at 5, 10, 15, 30 and 60 minutes after extubation while breathing room air. Data were analysed using Kruskal-Wallis and Friedman tests (p < 0.050). Results At any time point after extubation, PaO2 was not significantly different between groups. At 5 minutes after extubation, PaO2 was 95.1 (78.1-104.0), 93.8 (88.3-104.0), 96.9 (86.6-115.0) and 89.1 (87.6-102.0) mmHg in the SV, CMV, ARM1 and ARM2 groups, respectively. PaO2 decreased at 30 minutes after extubation in the CMV, ARM1 and ARM2 groups (p < 0.050), but it did not decrease after 30 minutes in the SV group. Moderate hypoxaemia (PaO2, 60-80 mmHg) was observed in one dog in the ARM1 group and two dogs each in the SV and ARM2 groups. Conclusions and clinical relevance Intraoperative ARMs, followed by PEEPmaxCrs+2, did not improve early post-operative arterial oxygenation compared with SV or CMV alone in healthy anaesthetized dogs. Therefore, this ventilatory strategy might not be clinically advantageous for improving postoperative arterial oxygenation in healthy dogs undergoing surgery when positioned in dorsal recumbency.
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收藏
页码:841 / 853
页数:13
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