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A member asked:
I had an ultrasound on my heart and they had me exhale for a long time, after the test they said i was good. why did they have me do that?
4 doctors weighed in across 2 answers
Better clarity : The act of inhaling/exhaling affects the flow of blood to your heart. By emphasizing a particular activity such as exhaling valve function in your heart can be better evaluated.
Answered 2/1/2015
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Ultrasound: When you inhale your lungs fill with air which scatters the ultrasound beam. We have folks exhale to minimize the beam interference that more air in the lungs causes.
Answered 3/20/2013
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