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| Study on avoiding spurious triggering of ventilator during mechanical chess compression |
| Huang Xing-wei, Su Ya-yan, Chen Mao-guang |
| Fujian Medical University Affiliated Mindong Hospital, Ningde 355000, China |
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Abstract Objective To use cardiopulmonary resuscitation machine for chest external pressure, such as mechanical ventilation (MV) according to normal parameters, easily trigger the ventilator to cause excessive ventilation and cause adverse consequences. The purpose of this experiment is to study how to avoid the spurious triggering of the ventilator in the process of using the cardiopulmonary resuscitation machine. Methods Eighty-three patients with respiratory cardiac arrest were randomly divided into two groups. V-SIMV plus 0 PSV and V-A/C plus -20 cm H2O pressure trigger sensitivity were used for ventilation respectively. The initial setting of ventilator high pressure alarm was 60 cm H2O. Then adjust according to the Peak airway pressure. Due to the significant differences in the time of onset, starting pressing time, and basic diseases between different patients, the comparison of physiological and biochemical indicators, oxygenation indicators, ROSC, and survival rates between the two groups was not statistically significant and did not include statistics. Due to the urgency of rescue, no esophageal pressure was measured. Results There was no spurious triggering between the two groups, and there was no difference in the incidence of high pressure alarm and the level of peak airway pressure between the two groups ［2.3% vs.2.5%,(46.74±4.12)cm H2O vs.(47.33±3.48)cm H2O, P＞0.05］. The ratio of minute ventilation volume to ideal body weight (MV/kg) was higher than expected in the two groups, and there was a significant difference in the MV/kg comparison between the two groups［(152.55±6.25)mL/(kg·min) vs.(70.98±1.07)mL/(kg·min)，P<0.01］. However, the MV shown on the ventilator when the chest is pressed is not a response to the patient′s real situation. Conclusion When using cardiopulmonary resuscitation machine with CPR, selecting V-SIMV plus 0 PSV or selecting V-A/C plus maximum negative pressure trigger sensitivity can avoid the ventilator being spurious triggered. Raising the upper limit of the pressure alarm and adjusting it according to the patient′s peak airway pressure can reduce the incidence of high pressure alarm.
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| About author:: Huang Xing-wei, E-mail： 423835286@qq.com |
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