| Autor: |
Zhao, Zhanqi, Chen, Tsai-Fen, Teng, Hui-Chen, Wang, Yi-Chun, Chang, Mei-Yun, Chang, Hou-Tai, Frerichs, Inéz, Fu, Feng, Möller, Knut |
| Předmět: |
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| Zdroj: |
Physiological Measurement; Jun2022, Vol. 43 Issue 6, p1-6, 6p |
| Abstrakt: |
Objective. The aim of the present study was to evaluate the variation of tidal volume-to-impedance ratio (V T/ Z T) during positive end-expiratory pressure (PEEP) titration with electrical impedance tomography (EIT) measurement. Approach. Forty-two patients with acute respiratory distress syndrome were retrospectively analyzed. An incremental and subsequently a decremental PEEP trial were performed with steps of 2 cm H2O and duration of 2 min per step during volume-controlled ventilation with decelerating flow. EIT measurement was conducted in the 5th intercostal space and V T was recorded simultaneously. The variation of V T/ Z T (RatioV) was defined as the changes in percentage to average ratio per cm H2O PEEP change. A z-score > 1 was considered as a significant variation and an implication that the measurement plane was inadequate. Main results. The RatioV of 42 patients was 1.29 ± 0.80%·cm H2Oâ'1. A z-score of 1 corresponded to the variation of 2.09%·cm H2Oâ'1. Seven patients (16.7%) had a z-score > 1 and showed either positive or negative correlation between the volume-to-impedance ratio and PEEP. Significance. Electrode placement at 5th intercostal space might not be ideal for every individual during EIT measurement. Evaluation of volume-to-impedance ratio variation is necessary for patients undergoing maneuvers with wide alteration in absolute lung volume. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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