dyspnea is exaggragated in lying down position with heart failure. what is the physiological basis

Hi Anon,

Thank you for sharing your question with the EmpowHER community.

For starters, any difficulty breathing when lying down should be reported to your doctor right away.  

Dyspnea also known as shortness of breath, breathlessness or breathing discomfort, is a sign of serious disease of the airway, lungs or heart. Dyspnea has many causes and the explanation for the symptom may differ largely among each person.  It's 

Here is some additional information:

Definition of Dyspnea

What Causes Difficulty Breathing When Lying Down?

I hope this helps.

Be well.

~Gillette