A study of 4,078 patients who underwent angioplasty found that more than half of those who died within 30 days of the procedure did so because of complications unrelated to the intervention. Patients whose deaths were unrelated to the procedure faced higher likelihood of presenting in cardiac arrest or cardiogenic shock, had a higher incidence of heart failure and were more likely to die during admission, according to the study. The study also found that death certificates were less accurate than patient charts in noting the cause of death. The research raises questions about the use of 30-day mortality as a quality metric.

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