Dyspnea (shortness of breath).
Cardiac dyspnea is exertional.
Establish limitations e.g.: walking one block.

Dyspnea
Exertional.
Paroxysmal nocturnal dyspnea (attacks of shortness of breath, usually awakening the patient in the middle of the night).
Orthopnea (dyspnea in the supine position).
Trepopnea (dyspnea in the lateral decubitus position).
Platypnea (dyspnea in the upright position).