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. 2009 Dec;35(12):2130-4.
doi: 10.1007/s00134-009-1663-5. Epub 2009 Sep 23.

Effect of closed endotracheal suction in high-frequency ventilated premature infants measured with electrical impedance tomography

Mariëtte B van Veenendaal  1 , Martijn Miedema, Frans H C de Jongh, Johanna H van der Lee, Inez Frerichs, Anton H van Kaam
Affiliations

Effect of closed endotracheal suction in high-frequency ventilated premature infants measured with electrical impedance tomography

Mariëtte B van Veenendaal et al. Intensive Care Med. 2009 Dec.

Abstract

Objective: To determine the global and regional changes in lung volume during and after closed endotracheal tube (ETT) suction in high-frequency ventilated preterm infants with respiratory distress syndrome (RDS).

Design: Prospective observational clinical study.

Setting: Neonatal intensive care unit.

Patients: Eleven non-muscle relaxed preterm infants with RDS ventilated with open lung high-frequency ventilation (HFV).

Interventions: Closed ETT suction.

Measurements and results: Changes in global and regional lung volume were measured with electrical impedance tomography. ETT suction resulted in an acute loss of lung volume followed by spontaneous recovery with a median residual loss of 3.3% of the maximum volume loss. The median stabilization time was 8 s. At the regional level, the lung volume changes during and after ETT suction were heterogeneous in nature.

Conclusions: Closed ETT suction causes an acute, transient and heterogeneous loss of lung volume in premature infants with RDS treated with open lung HFV.

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Figures

Fig. 1
Fig. 1
Representative tracing of global (a), ventral (b) and dorsal (c) impedance changes during endotracheal tube suction (infant 1). The lines in a indicate the mean pre-suction impedance, the maximum negative impedance level during suctioning and the mean post-suction impedance after stabilization. With this information the maximum impedance loss (M) and the residual impedance loss after suctioning (R) are calculated
See this image and copyright information in PMC

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