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Chinese Journal of Lung Diseases(Electronic Edition) ›› 2024, Vol. 17 ›› Issue (06): 942-947. doi: 10.3877/cma.j.issn.1674-6902.2024.06.016

• Original articles • Previous Articles    

Prognostic significance of dead space fraction in acute respiratory distress syndrome

Li Chen1, Juntai Guo1, Hongmei Ma1, Zunji Liu,1()   

  1. 1.Department of Critical Care Medicine, People's Hospital of Xinjiang Uygur Autonomous Region,Urumqi, Xinjiang 830001, China
  • Received:2024-09-13 Online:2024-12-25 Published:2025-01-23
  • Contact: Zunji Liu

Abstract:

Objective

To analyze the prognostic significance of dead cavity score (VD/VT) in acute respiratory distress syndrome (ARDS).

Methods

A total of 86 ARDS patients admitted to our hospital from March 2021 to March 2024 were selected.49 of them died in hospital in the observation group and 37 survived in the control group.Acute physiological and chronic health score Ⅱ(APACHEⅡ),positive end-expiratory pressure (PEEP) and oxygenation index (PaO2/FiO2) were recorded on the 1st and 3rd day after admission.in-hospital mortality was recorded.Blood gas tests were performed every 6 hours,and VD/VT was calculated using the Harris-Benedict formula (VD/VTHB) and the direct physiological variable estimation formula (VD/VTphys).The association between VD/VTphys,VD/VTHB and mortality was analyzed using restricted cubic splines (RCS).Receiver operating characteristic (ROC) curve was drawn to analyze the area under the curve(AUC) for predicting in-hospital observation in ARDS.

Results

VD/VTphys(0.56±0.04) and (0.59±0.06) on day 1 and day 3 in the death group,VD/VTHB(0.57±0.07),(0.59±0.08) were higher than those of control group (0.60±0.05),(0.63±0.05),VD/VTHB(0.62±0.08),(0.66±0.08) on day 1 and day 3(P<0.05).On day 3,VD/VTphys(0.63±0.05) and VD/VTHB(0.66±0.08) in the observation group were higher than those on day 1,compared with (0.60±0.05) and(0.62±0.08).VD/VTphys on day 3 (0.59±0.06) was higher than that on day 1(0.56±0.04) in control group.Multivariate Logistic regression analysis showed that third dVD/VTphys and VD/VTHB were associated with in-hospital death in ARDS patients (P<0.001).RCS analysis showed that the relationship between VD/VTphys or VD/VTHB and mortality risk at day 3 was non-linear,with a negative correlation when VD/VTHB was below 0.58.After admission,dVD/VTphys and VD/VTHB were added on the basis of dAPACHEⅡ,PEEP and PaO2/FiO2 to improve the predictive value of ARDS hospital death (P<0.05).

Conclusion

Estimation of VD/VT value on the 3rd day after admission can predict the prognosis of ARDS in hospital,which has clinical significance.

Key words: Acute respiratory distress syndrome, Estimation of dead cavity score, Mortality, VD/VTphys, VD/VTHB

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