Dyspnoea-Cardiac or Respiratory?

The best way is to see your medical professional...a cardiologist or pulmonologist.

I am myself a medical student and i got a presentation on breathlessness and i am expecting these questions to be asked

Wouldn't your professors or medical journals be the place to look for those answers?

We don't really have a large medical community here at a2k. So you shouldn't expect any legitimate answers here regarding that arena of topics.

I have been asked specifically to find out the answer by the professors!

thanks i am new to able2know so i wasnt aware of that thought i would give try... appreciate you for this info.

Just out of curiosity, did they ask you to try this forum, forums in general, or was the assignment to look up the answer on the Internet?

If the assignment was to look it up on the Internet, I'd look on Mayo Clinic's website or in a medical journal online such as JAMA.
http://www.mayoclinic.org/