ST elevation myocardial infarction prognosis

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Myocardial infarction
Classification and external resources
Diagram of a myocardial infarction (2) of the tip of the anterior wall of the heart (an apical infarct) after occlusion (1) of a branch of the left coronary artery (LCA, right coronary artery = RCA).
ICD-10 I21.-I22.
ICD-9 410
DiseasesDB 8664
MedlinePlus 000195
eMedicine med/1567  emerg/327 ped/2520

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Prognosis

The prognosis for patients with myocardial infarction varies greatly, depending on the patient, the condition itself and the given treatment. Using simple variables which are immediately available in the emergency room, patients with a higher risk of adverse outcome can be identified. For example, one study found that 0.4% of patients with a low risk profile had died after 90 days, whereas the mortality rate in high risk patients was 21.1%.[1]

Although studies differ in the identified variables, some of the more reproduced risk factors for higher mortality include:

  1. Advanced age
  2. Sinus tachycardia
  3. Reduced systolic blood pressure
  4. Heart failure or Killip class of two or greater
  5. Anterior myocardial infarction location

Other risk factors include diabetes, serum creatinine concentration, and peripheral vascular disease.[1][1][1]

Assesment of left ventricular ejection fraction may increase the predictive power of some risk stratification models.[1] The prognostic importance of Q-waves is debated.[1] Prognosis is significantly worsened if a mechanical complication (papillary muscle rupture, myocardial free wall rupture, and so on) were to occur.

There is evidence that case fatality of myocardial infarction has been improving over the years in all ethnicities.[1]

The Thrombolysis in Myocardial Infarction TIMI Risk Score [1] and TIMI Risk Index [1] are two prognostic indices that have been validated in clinical trials and epidemiologic studies to predict 30-day mortality among patients with STEMI.

The TIMI Risk Score incorporates eight clinical variables (age, systolic blood pressure [SBP], heart rate [HR], Killip class, anterior ST elevation or left bundle branch block on electrocardiogram, diabetes mellitus, history of hypertension or angina, low weight and time to treatment >4 hours) and assigns them a point value based on their odds ratio for mortality.

The TIMI Risk Score was developed and validated in clinical trials of fibrinolytic therapy, but it has also been reported to be prognostic in community-based real-world registries [1] as well as elderly patients [1].

The TIMI Risk Index incorporates age, HR and SBP (HR x [age/10] x 2/SBP), and has been validated in unselected patients [1], registries [1] and population-based cohorts [1]

Interestingly, although tobacco abuse is a risk factor for CAD and STEMI, smoking is associated with a lower risk of mortality among patients who present with STEMI [1] [1] This is due, at least in part, to the finding that smokers who present with STEMI are, on average, at least a decade younger than non-smokers. Smokers more often have involvement of the right coronary artery rather than the left anterior descending artery as well. Smokers paradoxically have better myocardial perfusion following reperfusion therapy than non smokers (Kirtane et al).

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

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