Venous air embolism (VAE) is the air bubble accumulation in the right side of the heart. or in the pulmonary region. Pre-cordial Doppler allows a real-time monitoring of heart sound and is used to detect VAE episodes through changes in cardiac sound. Sometimes these changes are not detected by the operator. https://www.chiggate.com/chromatics-6nn-6-0-natural-ultra-rich-cheap/