The prognosis post myocardial infarction varies greatly, depending on a person's health, the extent of the heart damage and the treatment given. For the period 2005 - 2008 in the United States the median mortality at 30 days was 16.6% with a range from 10.9% to 24.9% depending on the hospital.[80] Using variables available in the emergency room, people with a higher risk of adverse outcome can be identified. One study found that 0.4% of patients with a low risk profile died after 90 days, whereas in high risk people it was 21.1%.[81]
Some of the more reproduced risk stratifying factors include: age, hemodynamic parameters (such as heart failure, cardiac arrest on admission, systolic blood pressure, or Killip class of two or greater), ST-segment deviation, diabetes, serum creatinine, peripheral vascular disease and elevation of cardiac markers.[81][82][83] Assessment of left ventricular ejection fraction may increase the predictive power.[84] The prognostic importance of Q-waves is debated.[85] Prognosis is significantly worsened if a mechanical complication such as papillary muscle or myocardial free wall rupture occur.[86] Morbidity and mortality from myocardial infarction has improved over the years due to better treatment.[87]
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