What Would Cause Shadows In A Stress Test And The

What would cause shadows in a stress test and the area to not light up in a stress test?!my son is 38 and overworked and under a lot of stress and had been having chest pain and exhaustion. He has not gotten the cautherization yet they wanted to do but is still hurting in his chest and short of breath, tired and some pain under his armpit. And pain in his Achilles' tendon... He wanted to wait and get a second opinion Piedmont Hispital in Atlanta by a heart specialist which is 80 miles north of Columbus Ga. But is not feeling and thinks maby he should skip the 2nd. Opinion and ahead with the procedure. 10'years ago he was having pain in chest but stress test was normal. show dowry areas and not lighting up in areas where light should be in stress test. Is this something serious?