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Carteaux, Guillaume; Tuffet, Samuel; Mekontso Dessap, Armand
Critical care, 06/2021, Letnik: 25, Številka: 1Journal Article
To the Editor, Continuous anterior chest compression (CACC) may have protective effects in patients with the Acute Respiratory Distress Syndrome (ARDS) by decreasing the anterior chest wall compliance, thus decreasing the anterior transpulmonary pressure and the resulting risk of overdistension 1 along with promoting redistribution of ventilation through the dependent regions. Regional effects of CACC were the followings: * A decrease in anterior (ventral) lung regions distension: the positive stress index pattern disappeared, the end-inspiratory transpulmonary pressure decreased and the regional lung compliance in the anterior half increased. * A recruitment of the posterior (dorsal) lung regions: the number of pixels showing positive ∆Z in the posterior half of EIT matrix increased by 10% and the regional lung compliance in the posterior half increased. * A homogenization of tidal ventilation: the ratio between ventilation distributions of the anterior and posterior halves went from 60%/40% to 50%/50%. Discussion The dramatic increase in respiratory system compliance during CACC in this ARDS patient may result from several combined mechanisms: 1-In the part of the lung already aerated but subject to intra-tidal overdistension, the noticeable decrease in the end expiratory lung volume resulted in a leftward shift of the pressure–volume curve below the upper inflexion point 3, 2-the concomitant recruitment in the posterior regions resulted in an increase in the number of aerated lung units 4.
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