(This is an excerpt of the Health Rounds newsletter, where we present latest medical studies on Tuesdays and Thursdays.)

By Nancy Lapid

(Reuters) -A new testing protocol identifies patients whose chest pain is heart-related even though their main heart arteries look normal during typical exams, according to results of a new study.

During the usual coronary angiography testing procedure, patients lie on a table while doctors inject dye into the arteries that carry blood to the heart, looking for places in the larger vessels where flow of the dye is impaired or blocked.

“People may have real angina even when the main arteries appear wide open,” study leader Dr. Colin Berry of the University of Glasgow said in a statement.

When angiography is negative, doctors should consider using MRI t

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