Acute coronary syndrome (main): Difference between revisions

(Amended the background of ACS)
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==Background==
==Background==
[[File:MI types.png|thumbnail|Myocardial Infarction types]]
[[File:MI types.png|thumbnail|Myocardial Infarction types]]
ACS or acute coronary syndrome is the term that is applied to a spectrum of conditions compatible with acute myocardial ischemia and/or infarction that are usually due to an abrupt reduction in coronary blood flow.  
*Abbreviation: ACS
*Refers to a spectrum of conditions compatible with acute myocardial ischemia and/or infarction that are usually due to an abrupt reduction in coronary blood flow.  


ACS is thus spectrum of conditions involving the coronary arteries:
===Clinical Categories===
*[[ST-Elevation Myocardial Infarction (STEMI)]] (30%)
#[[ST-Elevation Myocardial Infarction (STEMI)]] (30%)
*[[Non ST-Elevation Myocardial Infarction (NSTEMI)]] (25%), [[Unstable Angina]] (38%)
#[[Non ST-Elevation Myocardial Infarction (NSTEMI)]] (25%)
**The new title, “Non-ST-Elevation Acute Coronary Syndromes,” emphasizes the continuum between UA and NSTEMI<ref>AHA ACA - NSTEMI ACS Guidelines 2014 [http://circ.ahajournals.org/content/130/25/e344 View Online]</ref>
#[[Unstable Angina]] (38%)
**NSTEMI myocardium is damaged enough to increase biomarkers, UA is not.
#*The new title, “Non-ST-Elevation Acute Coronary Syndromes,” emphasizes the continuum between UA and NSTEMI<ref>AHA ACA - NSTEMI ACS Guidelines 2014 [http://circ.ahajournals.org/content/130/25/e344 View Online]</ref>
#*NSTEMI myocardium is damaged enough to increase biomarkers, UA is not.


===MI Types by Causation<ref>Third Universal Definition of Myocardial Infarction http://circ.ahajournals.org/content/126/16/2020.full.pdf</ref>===
===MI Types by Causation<ref>Third Universal Definition of Myocardial Infarction http://circ.ahajournals.org/content/126/16/2020.full.pdf</ref>===
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===Evaluation===
===Evaluation===
*HEART Pathway: https://www.mdcalc.com/heart-pathway-early-discharge-acute-chest-pain
*[[ACS - Risk Stratification]]
*[[ACS - Risk Stratification]]


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==Disposition==
==Disposition==
*Admit all ACS patients
*Admit
**Ischemic ECG changes
**Pacemakers
**LBBB
**Positive troponins
**Abnormal vital signs
*ACC/AHA rec need for provocative testing withing 72 hrs, consider admitting
*For low risk (HEART) pts, may be better off discharge home with follow up<ref> Weinstock MB, Weingart S, Orth F, VanFossen D, Kaide C, Anderson J, Newman DH. Risk for Clinically Relevant Adverse Cardiac Events in Patients With Chest Pain at Hospital Admission. JAMA Intern Med. 2015 Jul;175(7):1207-12. </ref>
**Risk of MACE after neg ED work up 1/2422 vs Risk of preventable adverse event in hospital is 1/164


==External Links==
==External Links==
*[https://www.mdcalc.com/heart-pathway-early-discharge-acute-chest-pain  MDCalc - HEART Pathway]
*[http://www.mdcalc.com/framingham-coronary-heart-disease-risk-score/ MDCalc - Framingham Coronary Heart Disease Risk Score]
*[http://www.mdcalc.com/framingham-coronary-heart-disease-risk-score/ MDCalc - Framingham Coronary Heart Disease Risk Score]
*[http://www.mdcalc.com/sgarbossa-criteria-for-mi-in-left-bundle-branch-block/ MDCalc - Sgarbossa’s Criteria for MI in Left Bundle Branch Block]
*[http://www.mdcalc.com/sgarbossa-criteria-for-mi-in-left-bundle-branch-block/ MDCalc - Sgarbossa’s Criteria for MI in Left Bundle Branch Block]
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*[[ACS - Anatomical Correlation]]
*[[ACS - Anatomical Correlation]]
*[[ACS - Stress Testing]]
*[[ACS - Stress Testing]]
*[[ST-Elevation Myocardial Infarction (STEMI)]]
*[[ST-segment elevation myocardial infarction (STEMI)]]
*[[NSTEMI]]
*[[Non ST-Elevation Myocardial Infarction (NSTEMI)]]
*[[Unstable Angina]]
*[[Unstable angina]]
*[[Unstable Angina - NSTEMI Guidelines]]
*[[Cocaine Chest Pain]]  
*[[STEMI equivalents]]
*[[STEMI equivalents]]
*[[Myocardial infarction complications]]


==References==
==References==

Revision as of 14:02, 6 April 2019

For risk stratification see ACS - Risk Stratification

Background

Myocardial Infarction types
  • Abbreviation: ACS
  • Refers to a spectrum of conditions compatible with acute myocardial ischemia and/or infarction that are usually due to an abrupt reduction in coronary blood flow.

Clinical Categories

  1. ST-Elevation Myocardial Infarction (STEMI) (30%)
  2. Non ST-Elevation Myocardial Infarction (NSTEMI) (25%)
  3. Unstable Angina (38%)
    • The new title, “Non-ST-Elevation Acute Coronary Syndromes,” emphasizes the continuum between UA and NSTEMI[1]
    • NSTEMI myocardium is damaged enough to increase biomarkers, UA is not.

MI Types by Causation[2]

  • Type 1 - Spontaneous Myocardial Infarction
    • Atherosclerotic plaque rupture or intraluminal thrombus in one or more of the coronary arteries
  • Type 2 - Myocardial Infarction Secondary to an Ischaemic Imbalance
    • Condition other than CAD contributes to an imbalance between myocardial oxygen supply and/or demand
  • Type 3 - Cardiac Death Due to Myocardial Infarction
    • Suffer cardiac death with symptoms suggestive of myocardial ischaemia without elevated biomarkers
  • Type 4 - Myocardial Infarction Associated With Revascularization Procedure
    • 4a: Related to PCI
    • 4b: Related to Stent Thrombosis
  • Type 5 - Myocardial Infarction Related to CABG Procedure

Prognosis

Clinical Features

Risk of ACS

Clinical factors that increase likelihood of ACS/AMI:[3][4]

Clinical factors that decrease likelihood of ACS/AMI:[5]

  • Pleuritic chest pain
  • Positional chest pain
  • Sharp, stabbing chest pain
  • Chest pain reproducible with palpation

Gender differences in ACS

  • Women with ACS:
    • Less likely to be treated with guideline-directed medical therapies[6]
    • Less likely to undergo cardiac catheterization[6]
    • Less likely to receive timely reperfusion therapy[6]
    • More likely to report fatigue, dyspnea, indigestion, nausea or vomiting, palpitations, or weakness,[6] although some studies have found fewer differences in presentation[7]
  • More likely to delay presentation[6]
  • Men with ACS:
    • More likely to report central chest pain

Factors associated with delayed presentation[6]

  • Female sex
  • Older age
  • Black or Hispanic race
  • Low educational achievement
  • Low socioeconomic status

Differential Diagnosis

Chest pain

Critical

Emergent

Nonemergent

Elevated Troponin

True Positive

False (Non-CAD) Positives

Evaluation

Workup

Evaluation

ACS Anatomical Correlation Chart

Ischemic Changes Location Coronary Artery
STE V1-V3, TWI

Q waves in V1-V3 over time

Septal Septal branch
STE V2-V4 Anterior LAD
STE I, aVL, V5, V6

STD inf leads

Lateral Circumflex
STE I, aVL, V2-6 Anterolateral LAD + circumflex = Left main or 2 critical lesions
STE II, III, aVF

STD in aVL (most common lead to see reciprocal change)

Inferior RCA

STE V1 (only lead looking at RV)
STE III > II (III more R facing)
STE V1 > V2, STE V1 + STD V2

Right ventricle RCA

STD in V1, V2, V3;
R>S in V1
Tall R waves in V1-V3 (Q waves on back of heart) w/ upright TWs

Posterior aka Inferolateral RCA (90%), LCA (10%)
STE avR>V1

Doesn't apply in SVT

Anterolateral Left Main

Management

Intensity of treatment should be based on ACS likelihood

Disposition

  • Admit
    • Ischemic ECG changes
    • Pacemakers
    • LBBB
    • Positive troponins
    • Abnormal vital signs
  • ACC/AHA rec need for provocative testing withing 72 hrs, consider admitting
  • For low risk (HEART) pts, may be better off discharge home with follow up[8]
    • Risk of MACE after neg ED work up 1/2422 vs Risk of preventable adverse event in hospital is 1/164

External Links

See Also

References

  1. AHA ACA - NSTEMI ACS Guidelines 2014 View Online
  2. Third Universal Definition of Myocardial Infarction http://circ.ahajournals.org/content/126/16/2020.full.pdf
  3. Body R, Carley S, Wibberley C, et al. The value of symptoms and signs in the emergent diagnosis of acute coronary syndromes. Resuscitation. 2010;81(3):281–286. PMID: 20036454
  4. Panju AA, Hemmelgarn BR, Guyatt GH, et al. The rational clinical examination. Is this patient having a myocardial infarction? JAMA. 1998;280(14):1256–1263. PMID: 9786377
  5. Swap CJ, Nagurney JT. Value and limitations of chest pain history in the evaluation of patients with suspected acute coronary syndromes. JAMA. 2005;294(20):2623–2629. PMID: 16304077
  6. 6.0 6.1 6.2 6.3 6.4 6.5 Mehta LS, et al. Acute myocardial infarction in women: A scientific statement from the American Heart Association. Circulation. 2016; 133:916-947.
  7. Gimenez MR, et al. Sex-specific chest pain characteristics in the early diagnosis of acute myocardial infarction. JAMA Intern Med. 2014; 174(2):241-249.
  8. Weinstock MB, Weingart S, Orth F, VanFossen D, Kaide C, Anderson J, Newman DH. Risk for Clinically Relevant Adverse Cardiac Events in Patients With Chest Pain at Hospital Admission. JAMA Intern Med. 2015 Jul;175(7):1207-12.