- Poster presentation
- Open Access
Continuous elevation of lung sound amplitudes, recorded at fixed flow rate, may indicate an increase in lung water content
© Lev et al. 2011
- Published: 1 March 2011
- Pulmonary Edema
- Endotracheal Tube
- Breath Sound
- Extravascular Lung Water
- Water Index
Vibration response imaging (VRI) is a bedside lung sound monitoring system. We previously reported that vibration intensity can be significantly elevated in patients with congestion, as opposed to pleural effusion, atelectasis, or normal lung . We hypothesized that changes in lung water content (that is, pulmonary edema) may influence breath sound amplitude and explored the possibility of using continuous digitalized lung sound monitoring as a means to track changes in extravascular lung water (EVLW).
EVLW was increased in three pigs: in two animals by installation of saline into the endotracheal tube, and in one animal with sepsis-induced edema. In both models the increase in extravascular lung water index (EVLWi) was evaluated by the PiCCO system, and lung sound amplitude was monitored with the VRI. Animals were ventilated at a fixed flow rate.
These preliminary results suggest that continuous elevation of lung sound amplitudes, recorded at fixed flow rate, may indicate an increase in lung water content.
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