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Chinese Journal of Critical Care & Intensive Care Medicine(Electronic Edition) ›› 2018, Vol. 04 ›› Issue (02): 147-152. doi: 10.3877/cma.j.issn.2096-1537.2018.02.009

Special Issue:

• Critical Neurology • Previous Articles     Next Articles

Low tidal volume ventilation in severe brain injury patients: a retrospective observational study

Yu Wang1, Jingran Chen2, Yumei Wang2, Zhonghua Shi2, Jianxin Zhou2,()   

  1. 1. Department of Critical Care Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China; Intensive Care Unit, Xingtai People′s Hospital, Xingtai 054001, China
    2. Department of Critical Care Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China
  • Received:2018-02-12 Online:2018-05-28 Published:2018-05-28
  • Contact: Jianxin Zhou
  • About author:
    Corresponding author: Zhou Jianxin, Email:

Abstract:

Objective

To investigate application of small tidal volume (VT) ventilation in severe brain injury patients.

Methods

Data of mechanical ventilation were retrospective collected in brain injury patients who were admitted to the general and neurological intensive care unit of Beijing Tiantan Hospital affiliated to the Capital Medical University and mechanically ventilated over 48 hours. Daily ventilation parameters at 8 o′clock am and 7 o′clock pm were collected from electronic medical and nursing information systems. VT per predicted body weight was calculated and averaged during the entire mechanically ventilated period using a time-weighted method.

Results

From Sep. 2015 to Sep. 2017, 185 patients were enrolled and data at 2082 time points were collected. The median (interquartile range) VT was 7.9 (7.0, 9.1) ml/kg PBW. There were 1027 (49.3%) time points at which VT was higher or equal to 8 ml/kg PBW. VT settings were significantly lower in volume-targeted modes [7.3 (6.8, 8.4) ml/kg PBW] than those in pressure-targeted modes [8.2 (7.0, 9.7) ml/kg PBW] (Z=-10.098, P<0.001). There were 77 (41.6%) patients whose time-weighted average VT were lower than 8 ml/kg PBW and 108 (58.4%) patients higher than or equal to 8 ml/kg PBW. Compared to patients with lower time-weighted average VT, more patients were post-operative for brain tumor [82 (75.9%) vs 41 (53.2%), χ2=10.376, P=0.001], ventilated with pressure support mode[58 (53.7%) vs 28 (36.4%), χ2=5.433, P=0.02] and with higher initial VT in higher time-weighted average VT [8.8 (8.2,11.0) ml/kg vs 7.6 (6.7,8.8) ml/kg, Z=-7.345, P<0.001].

Conclusion

Approximately half of the severe brain injury patients in this trial received non-protective VT. More attention should be paid to this population.

Key words: Brain injury, Mechanical ventilation, Mode, Tidal volume

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