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#Hypothermia<ref name="pmid12475451">{{cite journal| author=Dixon SR, Whitbourn RJ, Dae MW, Grube E, Sherman W, Schaer GL et al.| title=Induction of mild systemic hypothermia with endovascular cooling during primary percutaneous coronary intervention for acute myocardial infarction. | journal=J Am Coll Cardiol | year= 2002 | volume= 40 | issue= 11 | pages= 1928-34 | pmid=12475451 | doi= | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12475451  }} </ref>
#Hypothermia<ref name="pmid12475451">{{cite journal| author=Dixon SR, Whitbourn RJ, Dae MW, Grube E, Sherman W, Schaer GL et al.| title=Induction of mild systemic hypothermia with endovascular cooling during primary percutaneous coronary intervention for acute myocardial infarction. | journal=J Am Coll Cardiol | year= 2002 | volume= 40 | issue= 11 | pages= 1928-34 | pmid=12475451 | doi= | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12475451  }} </ref>
#Hyperoxemia, the delivery of supersaturated oxygen after PCI (Studied in the AMIHOT II trial<ref name="pmid20031745">{{cite journal| author=Stone GW, Martin JL, de Boer MJ, Margheri M, Bramucci E, Blankenship JC et al.| title=Effect of supersaturated oxygen delivery on infarct size after percutaneous coronary intervention in acute myocardial infarction. | journal=Circ Cardiovasc Interv | year= 2009 | volume= 2 | issue= 5 | pages= 366-75 | pmid=20031745 | doi=10.1161/CIRCINTERVENTIONS.108.840066 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20031745  }} </ref>).
#Hyperoxemia, the delivery of supersaturated oxygen after PCI (Studied in the AMIHOT II trial<ref name="pmid20031745">{{cite journal| author=Stone GW, Martin JL, de Boer MJ, Margheri M, Bramucci E, Blankenship JC et al.| title=Effect of supersaturated oxygen delivery on infarct size after percutaneous coronary intervention in acute myocardial infarction. | journal=Circ Cardiovasc Interv | year= 2009 | volume= 2 | issue= 5 | pages= 366-75 | pmid=20031745 | doi=10.1161/CIRCINTERVENTIONS.108.840066 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20031745  }} </ref>).
#Bendavia studied in the EMBRACE STEMI trial


==Therapies Associated with Improved Clinical Outcomes==
==Therapies Associated with Improved Clinical Outcomes==

Revision as of 15:14, 19 August 2015


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Editors-In-Chief: Anjan K. Chakrabarti, M.D. [1]; C. Michael Gibson, M.S., M.D. [2]

Overview

While many pharmacotherapies are successful in limiting reperfusion injury in animal studies or ex-vivo, many have failed to improve clinical outcomes in randomized clinical trials in patients.

Therapies Associated with Limited Success

Pharmacotherapies that have either failed or that have met with limited success in improving clinical outcomes include: [1]

  1. Beta-blockade
  2. GIK (glucose-insulin-potassium infusion) (Studied in the Glucose-Insulin-Potassium Infusion in Patients With Acute Myocardial Infarction Without Signs of Heart Failure: The Glucose-Insulin-Potassium Study (GIPS)-II [2] and other older studies[3][4][5][6][7][8][8][9][10][11][12][13][14][15][16]
  3. Sodium-hydrogen exchange inhibitors such as cariporide (Studied in the GUARDIAN [17] [18] and EXPIDITION [19] [20] trials)
  4. Adenosine (Studied in the AMISTAD I [21] and AMISTAD II [22] trials as well as the ATTACC trial [23]). It should be noted that at high doses in anterior ST elevation MIs, adenosine was effective in the AMISTAD trial. Likewise, intracoronary administration of adenosine prior to primary PCI has been associated with improved echocardiographic and clinical outcomes in one small study. [24]
  5. Calcium-channel blockers
  6. Potassium–adenosine triphosphate channel openers[25][26]
  7. Antibodies directed against leukocyte adhesion molecules such as CD 18 (Studied in the LIMIT AMI trial [27])
  8. Oxygen free radical scavengers/anti-oxidants, including Erythropoietin[28][29][30][31][32], estrogen[33][34], heme-oxygenase 1[35], and hypoxia induced factor-1 (HIF-1)[36].
  9. Pexelizumab, a humanized monoclonal antibody that binds the C5 component of complement (Studied in the Pexelizumab for Acute ST-Elevation Myocardial Infarction in Patients Undergoing Primary Percutaneous Coronary Intervention (APEX AMI) trial [37] )
  10. KAI-9803, a delta-protein kinase C inhibitor (Studied in the Intracoronary KAI-9803 as an adjunct to primary percutaneous coronary intervention for acute ST-segment elevation myocardial infarction trial or DELTA AMI trial)[38].
  11. Human atrial natriuretic peptide (Studied in the Human atrial natriuretic peptide and nicorandil as adjuncts to reperfusion treatment for acute myocardial infarction (J-WIND): two randomised trials.)[39]
  12. FX06, an anti-inflammatory fibrin derivative that competes with fibrin fragments for binding with the vascular endothelial molecule VE-cadherin which deters migration of leukocytes across the endothelial cell monolayer (studied in the F.I.R.E. trial (Efficacy of FX06 in the Prevention of Myocardial Reperfusion Injury)[40]
  13. Magnesium, which was evaluted by the Fourth International Study of Infarct Survival (ISIS-4)[41] and the MAGIC trial[42].
  14. Hypothermia[43]
  15. Hyperoxemia, the delivery of supersaturated oxygen after PCI (Studied in the AMIHOT II trial[44]).
  16. Bendavia studied in the EMBRACE STEMI trial

Therapies Associated with Improved Clinical Outcomes

Therapies that have been associated with improved clinical outcomes include:

  1. Post conditioning (short repeated periods of vessel opening by repeatedly blowing the balloon up for short periods of time).[45][46]
    • Mechanisms of protection include formation and release of several autacoids and cytokines, maintained acidosis during early repercussion, activation of protein kinases, and attenuation of opening of the mitochondrial permeability transition pore (MPTP)
    • One study in humans demonstrated an area under the curve (AUC) of creatine kinase (C) release over the first 3 days of reperfusion (as a surrogate for infarct size) was significantly reduced by 36% in the postconditioned versus control group[47]
    • Infarct size reduction by PCI postconditioning persisted 6 months after AMI and resulted in a significant improvement in left ventricular (LV) function at 1 year[45]
  2. Inhibition of mitochondrial pore opening by cyclosporine. [48]
    • Specifically, the study by Piot et al demonstrated that administration of cyclosporine at the time of reperfusion was associated with a reduction in infarct size
    • Infarct size was measured by the release of creatine kinase and delayed hyperenhancement on MRI
    • Patients with cardiac arrest, ventricular fibrillation, cardiogenic shock, stent thrombosis, previous acute myocardial infarction, or angina within 48 hours before infarction were not included in the study #*Occlusion of the culprit artery (TIMI flow 0) was part of the inclusion criteria.

Limitations to applying strategies that have demonstrated benefit in animal models is the fact that reperfusion therapy was administered prior to or at the time of reperfusion. In the management of STEMI patients, it is impossible to administer the agent before vessel occlusion (except during coronary artery bypass grafting). Given the time constraints and the goal of opening an occluded artery within 90 minutes, it is also difficult to administer experimental agents before reperfusion in STEMI.

There are several explanations for why trials of experimental agents have failed in this area:

  1. The therapy was administered after reperfusion and after reperfusion injury had set in
  2. The greatest benefit is observed in anterior ST elevation myocardial infarctions (as demonstrated in the AMISTAD study), and inclusion of non anterior locations minimizes the potential benefit
  3. There are uninhibited redundant pathways mediating reperfusion injury
  4. Inadequate dosing of the agent

References

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  2. Timmer JR, Svilaas T, Ottervanger JP; et al. (2006). "Glucose-insulin-potassium infusion in patients with acute myocardial infarction without signs of heart failure: the Glucose-Insulin-Potassium Study (GIPS)-II". J. Am. Coll. Cardiol. 47 (8): 1730–1. doi:10.1016/j.jacc.2006.01.040. PMID 16631017. Unknown parameter |month= ignored (help)
  3. "Potassium, glucose, and insulin treatment for acute myocardial infarction". Lancet. 2 (7583): 1355–60. 1968. PMID 4177929. Unknown parameter |month= ignored (help)
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