english: This is a condition in which the heart fails, and instead of being able to pump all the blood forward, some of the blood backs up into the lung, the lungs fill up with blood, and that's why you have shortness of breath.
non_english: U tom stanju srce prestane da radi, i umesto da ispumpava krv u sistemski krvotok, deo krvi se vraća u pluća koja se pune krvlju, i zato imate kratak udisaj.