What does "platypnea" mean?

Shortness of breath that occurs when the patient is upright, that is, sufficient breathing only when lying flat.

Platypnea

noun

noun ·Rare ·Advanced level

Noun

1
Shortness of breath that occurs when the patient is upright, that is, sufficient breathing only when lying flat. uncountable

From platy- + -pnea, from Ancient Greek πλατύς (platús, “flat”) and πνοή (pnoḗ, “breath, breathing”).