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The article discusses the relevance of percutaneous coronary intervention (PCI), which is performed in about 600,000 cases in the U.S. per year and costs a total of 12 billion U.S. dollars. In a study conducted by the authors to understand the need for the procedure, they use data from the National Cardiovascular Data Registry between July 1, 2009 and September 30, 2010 with an aim of finding the proportion of appropriate, uncertain or inappropriate PCI. They conclude that most PCIs done in the U.S. were appropriate with only 12% being tagged as inappropriate.

Evaluates which element of the Braunwald classification independently contribute risk for major cardiac complications. Method of combining predictive factors into an overall odds ration for complications; Identification of four clinical factors used in the Braunwald classification.