Bonow says he expects the new findings could "put the brakes" on current enthusiasm for the test.

CNN: Newer heart test may not be better

Growing new hearts for human beings "is still a ways off, " said Dr. Robert Bonow, a past president of the American Heart Association.

CNN: New hope may lie in lab-created heart

Dr. Robert Bonow, chief of cardiology at Northwestern University's Feinberg School of Medicine, notes that about 10 percent of study participants with a positive test had normal coronary arteries, and 17 percent of those with a normal test had coronary disease.

CNN: Newer heart test may not be better