神经调节辅助通气在早产儿呼吸窘迫综合征中的应用

目的观察神经调节辅助通气(neurally adjusted ventilatory assist,NAVA)对于早产儿呼吸窘迫综合征机械通气中触发同步性、气体交换和呼吸力学的影响。方法 10例呼吸窘迫综合征的早产儿先后给予NAVA和同步间歇指令通气(SIMV)模式通气各60 min,在模式选择顺序上采用随机化处理。比较不同通气模式中患儿生命体征、触发同步性和血气指标、呼吸力学参数。结果 NAVA模式下吸气触发延迟时间较SIMV模式明显缩短(P0.05);2种模式下动脉血pH、PaCO2、PaO2、PaO2/FiO2比较差异均无统计学意义;应用NAVA模式时自主呼吸频率、气道峰压、膈肌电活动信号和呼吸做功均较SIMV模式明显降低(P0.05)。结论对早产儿呼吸窘迫综合征进行机械通气治疗时,与SIMV模式相比,NAVA模式能改善触发同步性,降低气道峰压,并减少膈肌负荷和呼吸做功。

Application of neurally adjusted ventilatory assist in preterm infants with respiratory distress syndrome

Objective To observe the effects of neurally adjusted ventilatory assist (NAVA) on the patient-ventilator synchrony, gas exchange, and ventilatory parameters in preterm infants with respiratory distress syndrome (RDS) during mechanical ventilation. Methods Ten preterm infants with RDS received mechanical ventilation in NAVA mode for 60 minutes and in synchronized intermittent mandatory ventilation (SIMV) mode for 60 minutes, and the two modes were given in a random order. The vital signs, patient-ventilator synchrony, blood gas values, and ventilatory parameters were compared between the two ventilation modes. Results Inspiratory trigger delay was significantly shorter with NAVA than with SIMV (P<0.05). There were no significant differences in arterial pH, PaCO₂, PaO₂ and PaO₂/FiO₂ between the two modes. The spontaneous respiratory rate, peak inspiratory pressure (PIP), electrical activity of the diaphragm and work of breathing were significantly lower in NAVA than in SIMV (P<0.05). Conclusions Compared with SIMV, NAVA appears to improve patient-ventilator synchrony, decrease PIP, and reduce diaphragmatic muscle load and work of breathing in preterm infants with RDS during mechanical ventilation.