Extravascular lung water measurement

Standard methods of assessing pulmonary oedema are indirect. The CXR allows qualitative assessment only and is slow to change in response to clinical treatment. Assessment of cardiac filling pressures does not take into account the degree of capillary permeability or lymphatic adaptation. Consequently, a relatively low CVP or PAWP may be associated with pulmonary oedema formation and high filling pressures in chronic heart failure may be associated with no oedema and be entirely appropriate. Extravascular lung water (EVLW) measurement provides a technique for quantifying pulmonary oedema and monitoring the response to treatment.

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