<prompt> Most sensitive investigation for air embolism isDecreased tidal volume of CO2Decreased tidal volume of NO2Doppler ultrasoundCentral venous presure  <response>: Although transesophageal echocardiography TEE is the most sensitive method for venous air embolism VAE detection and is considered the gold standard, it is costly and more invasive. When properly placed, a precordial Doppler is capable of identifying VAE at an air infusion rate as low as 0.015 mlkg min and consistently at a rate of 0.021 mlkg min. 