There is now more evidence that drugs should be tried first and often are just as effective in patients with chronic chest pain who are not in big danger of a heart attack. The slim early advantage for angioplasty at relieving pain in these nonemergency cases starts to fade within six months and vanishes after three years, according to a report from a landmark heart study. That is sooner than the five years doctors estimated in 2007 after their first analysis of the study.