1. Acute myocardial infarction (AMI) or heart attack results from prolonged ischemia of cardiac myocytes due to occlusion of a coronary artery by thrombus or plaque.
2. Diagnosis is based on symptoms, electrocardiogram changes showing ST elevation or depression, and elevated cardiac troponin or CK-MB levels.
3. Treatment depends on whether ST elevation is present on ECG, with ST elevation MI treated with percutaneous coronary intervention or thrombolysis to restore blood flow, while non-ST elevation MI may be treated medically or with coronary angiography.
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This presentation is made to help students prepare for EDIC exam. this is board review for any exam for critical care examining acute MI, myocardial infarction, acute coronary syndrome.
Acute coronary syndrome for critical care examDr fakhir Raza
This presentation is made to help students prepare for EDIC exam. this is board review for any exam for critical care examining acute MI, myocardial infarction, acute coronary syndrome.
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4. Definitio
n
• Acute myocardial infarction
(MI) is a clinical syndrome
that results
occlusion of a
coronary
with resultant death of
from
artery,
cardia
c
myocytes in the
region
supplied by that artery.
• У
даан хугацааны миокардын ишемийн
улмаасүхжлийн голомт үүсэхийг ЗЦШгэнэ
Defined by “Current diagnosis and treatment in Cardiology -
2013”
5. Definitio
n
• Acute Coronary Syndrome is
following disruption of a
vulnerable plaque, patients
experience ischemic discomfort
resulting from a reduction of
flow through the affected
epicardial coronary artery.
– STEMI
– NSTEMI
– Unstable angina
7. Causes of Acute
Coronary
Syndromes
• Atherosclerotic plaque rupture with
superimposed thrombus/95%/
• Vasculitic syndromes
• Coronary embolism (e.g., from endocarditis, artificial
heart valves)
• Congenital anomalies of the coronary arteries
• Coronary trauma or aneurysm
• Severe coronary artery spasm (primary or cocaine-
induced)
• Increased blood viscosity (e.g.,
polycythemia vera, thrombocytosis)
• Spontaneous coronary artery dissection
• Markedly increased myocardial oxygen demand (e.g.,
severe
aortic stenosis)
8. Risk
factors
• American Heart Association guide to risk
factors for coronary artery disease.
• Resource:“Cardiology explained”
9. Risk
factors
European Society of Cardiology table of lifestyles and characteristics
associated with an increased risk of a future coronary heart disease
event.
19. By necrotic
area:
• Micro size of MI
• Small size of MI (LV muscle
damage
<10%)
• Moderate size of MI (LV
muscle damaged 10-30%)
• Large size of MI (LV muscle
>30%)
22. Anamnesi
s:
• Complains
• Onset of disease
• Time
– initial of disease - calling 103
– Initial of disease – arrive of a
Doctor
• Risks/HTN, Smoking,
Diabetes, stress,
hereditary/
• Whether having MI, AP,
23. Symptom
s
• By CHEST PAIN:
Typical or classical type of
MI
Atypical type of MI
Asthmatic
Abdominal
Low blood pressure
Arrhythmatic
Brain’s
24. Chest pain of
MI
Pain
indicato
rs
Description
Location Behind side of sternum, left side of chest
Radiation Left arm, jaw, neck
Characterizes Pressure, dull, squeezing, aching,
crushing, burning /elephant sitting in
the chest/
Duration >10-20mins
Relieving
factor
No abatement of nitroglycerin, relieved
with analgesic/morphine/
Associate
d
symptom
s
Weakness, dyspnea, fainting
fit/syncope/ Cold sweat,
apprehensive.
Dyspnea, orthopnea, cough,
wheezing, nausea and vomiting, or
Occurs at rest, more commonly in the early
morning
25. Painless
infarction
• One-third of patients with acute
myocardial infarction present without
chest pain, and these patients tend to
be undertreated and have poor
outcomes.
• Older patients, women, and patients
with diabetes mellitus are more likely to
present without classic chest pain. As
many as 25% of infarctions are
detected on routine ECG without any
recallable acute episode.
27. General
signs
• Patients may appear anxious and
sometimes are sweating
profusely.
• The heart rate may range from
bradycardia (most
commonly
infarction)
to
tachycardi
a,
marked
in inferior
low
cardia
c
output, or arrhythmia.
• The BP may be high, especially in former
hypertensive patients, or low in patients
with shock.
• Respiratory distress usually indicates
heart failure.
• Fever, usually low grade, may appear
after 12
28. Che
st
• The Killip classification is the standard way to classify
heart failure in patients with acute myocardial infarction
and haspowerful prognosticvalue.
• Killip class I is absence of rales and S3
• Class II is rales that do not clear with
coughing over one-third or less of the lung
fields or presence of an S3
• Class III is rales that do not clear with
coughing over more than one-third of the
lung fields
• Class IV is cardiogenic shock (rales,
hypotension, and signs of hypoperfusion).
29. Hear
t
• Jugul
ar
venous distention reflects
RA
hypertension, and a Kussmaul sign (failure
of decrease of jugular venous pressure
with inspiration) is suggestive of RV
infarction. Soft heart sounds may indicate
LV dysfunction.
• Atrial gallops (S4) are the rule, whereas
ventricular gallops (S3) are less common
and
indicate
significan
t
LV dysfunction. Mitral
regurgitation murmurs are not uncommon
and may indicate papillary muscle
dysfunction or, rarely, rupture. Pericardial
friction rubs are uncommon in the first 24
hours but may appear later.
30. EC
G
• It should be performed as soon
as possible, preferably within
10 minutes, after the patient’s
arrival in the emergency
department or clinician’s office,
since the presence
or
absenc
e
determine
s
of ST
elevation the
preferred
management
strategy.
31. ECG early
changes
• Presence of MI
• QRS complex, ST segment, T
waves are changed
• Tall T wave in contiguous 2 or
more leads
32. MI’s specific
changes
• Pathological Q wave present in
≥2 leads
• Pathological Q wave indicate
cellular necrosis
• It is generated after beginning of
infarction in 8-6 hours
• ST segment’s elevation is
formed after beginning of
infarction in 4-2 hours
33. Ischemic changes in
ECG
• ST segment elevation
• ST segment’s elevation (J-point):
elevated in
– V2-V3: for men ≥2 mm, for women ≥1,5 mm
or
– contiguous 2 leads for another leads
• ST segment depression and T wave
changes
• ST segment
depresse
d downward in
contiguous
by horizontal or
2 leads ≥0,5 cm
depressed from isoelectric line, inverted
and negative poled(≥1 mm) T wave, more
elevated R wave or R/S ratio be >1
• It is positive without LV hypertrophy and LBBB
34. Goal of ECG during
MI
• Confirm or deny DS
• Identify location of infarction
• Identify size of infarction
• Identify time of infarction
• Control outcome of
treatment
38. Serum
analyze
Indicators:
• Troponin T
and I (cTnT,
cTnI)
• CK-MB
(creatinine
phosphokinase
myocardial
bound)
• Myoglobin
• LDH (Lactate
dehydro)
Goal:
• Confirm or deny
DS
• Identify size of MI
• Assess result
of fibrinolytic
treatment
• Diagnosing
relapse of MI
39. Troponin using method
for DS of MI
• Result must be ready within 1
hour
• Make second analysis after
6-12 hours if first result is
negative
• Negative first result is not
enough to reject MI
• Shouldn’t make MI diagnosewith
only Troponin (+)
42. Criteria of
MI
• Troponin or CK-MB increased with
one of these:
– Chest pain
– Positive ischemic change in
ECG (ST segment and Twave’s
changes)
– Pathological Q wave presence in ECG
newly
– Patient had CABG
– Detected pathological changes in
autopsy
44. Formulation of
DS
• Diagnosis must be including
location of infarction, type
and complication.
• DS:Anterior lateral wall of LV’s
transmural MI. Pulmonary
edema.
45. General principle of
DS
• We should take DS as early
as possible. It directly
related to treatment result
and prognosis.
• Use Diagnosis criteria!
• DSmust be including infarction’s
location, type and
complication
46. Assessment of
risk /patient with MI/
Age ≥65 years old
* ≥3 risk factors for coronary disease
Known coronary stenosis of ≥50% by pre-
sentation
At least 2 anginal episodes in prior 24 hours
Use of aspirin in prior 7 days (i.e., implying
resistance to aspirin’s effect)
Elevated serum Troponin or CK-MB
1 score given each question
* - MI’s hereditary anamnesis,HTN,DM, Smoking,Dyslipidemia
47. Assessment of
risk
• Total score is TIMI /Thrombolysis
in myocardial infarction/
assessment’s score
• Total scores:
– 2-1: Low risk
– 4-3: Moderate risk
– 7-5: High risk
• TIMI is important for deciding
esp. NSTEMI prognosis
48. It should be successively staged
Pre-hospital management
Emergency department therapy
Post discharge
As quickly as begin treatment
Correctly choose treatment method
Correctly combine treatment
methods
50. Morphin
e
• Analgesic
• Sedative
• Reducing fear
• Dilate venous
reduce heart
burden (important
in pul.edema)
• Reduce
sympathetic
tonus
• 4-8 mg by IV
• Repeat 2-4 mg by
IV in 5-15 mins
• Vomiting –
Metoclopramide
/5- 10 mg by IV/
• Hypotension,
bradyc ardia –
Atropine
/0,5-1 mg by IV/
• Naloxone /0,1-
0,2 mg by IV/
• The highest dose
of Morphine: 20
mg
51. Improving heart blood
supply
OXYGEN
• 2-8 liter per
minute by
nasotubule
• Saturation: >90%
NITROGLYCERIN
• Dilating
coronary
artery
• 0,3-0,6 mg by
sublingual or
spray
• Repeat 2 times in
5 minute
52. Pre-Hospital
care
Aspirin /ASA/
• 162-325 mg by
chew
• If contraindicated:
Clopidogrel
Fibrinolytic therapy
• Anistreplase/Strept
o kinase/
Urokinase
• Slowly ejecting by
IV
/>5 minutes/
• If Carrying to
hospital
requires
>30 minutes
57. Referenc
e
• “Зүрх судлал” Д.Зулгэрэл, Ө.Цолмон нар, 2012он
• “Зүрхний цочмог шигдээсийн эмнэл зүйнудирдамж”
2013он
• “Cardiology explained” Euan A Ashley and
Josef Niebauer
• “Current diagnosis and treatment in Cardiology”Michael
H. Crawford, 3rd edition
• “Current Medical diagnosis and treatment –2013”
Maxine A. Papadakis, Stephen J. McPhee
• “Harrison’s Cardiovascular medicine” Joseph
Loscalzo, 17th edition
• “Pathophysiology of heart” Leonard S.Lilly, 5th edition
• “Pathophysiology concepts of Altered HealthStates”
Carol Mattson Porth, 7th edition