Acute Coronary Syndrome Flashcards
For 12 Lead EKG, just note that how many leads are actually being placed ?
6
what is at the fifth intercostal space at the midclavicular line ?
apical pulse
what is the function of an EKG?
electrical activity/conduction that is going through the heart at the moment
what is the most useful EKG?
having a baseline EKG, usually starting at 50 years old because if you have chest pain coming in at an older age, then compare the baseline and today of having chest pain
does a normal EKG means that your heart is perfect?
yes or no and why ?
no
it just shows that a the very moment, a normal electrical conduction is being sent through your heart
how long is the EKG strip?seconds wise?
6 second
having a 6 second EKG strip, if the heart is normal, what can you estimate?
a pulse
multiple this by 10
what does the P wave mean?
atrial depolarization
what does the QRS complex mean?
ventricular depolarization
what does T wave mean?
ventricular repolarization
can we tell where in the heart a heart attack is happening through an EKG?
yes or no and why ?
yes
we can see through an EKG that if the person if having a heart attack, the respected lead will show abnormality in that certain section of the heart
what is ischemia ?
when there is not enough oxygen getting into your heart ; doesn’t mean you have tissue death currently unless
we dont fix it, there will be tissue death
what conditions have ischemia issues ? (3)
acute coronary syndrome
heart attack
unstable angina
what are we doing to see in ischemia on an EKG?
ST-segment depression & T wave inversion
ST-segment depression is significant if it is at least 1mm ( one small box ) below the isoelectric line
does ST-segment depression and T wave inversion for ischemia ever go back to normal and if it can, how can it?
it can change back to normal when we fix the adequate blood flow and oxygen back to the myocardium
( heart )
If there is an injury( usually necrosis is going on) to the heart, what can we see in an EKG?
ST-segment elevation occurs
- significant if >1mm above the isoelectric line
ST-segment elevation happens when there is damage/injury to the heart, what do most people call it when looking at the EKG?
tombstones
if we treat the injury of the heart causing ST-segment elevation promptly and effectively, what are we avoiding?
infarction
if the injury of the heart causing ST-segment elevation has absence of _____markers confirms that ____didnt happen
serum cardiac markers
no infarction didn’t happen
Sometimes with ST-segment elevation we can have pathologic Q wave, what does it mean ?
there is probably ischemia to the cardiac muscle
How do we know when an infarction is happening or has happened in the EKG?
Physiologic Q wave is the first negative deflection following the P wave
What is acute coronary syndrome ?
Prolonged Ischemia to the heart muscle, that may or not been reversible ;
not reversible immediately
Acute coronary syndrome is a underbelly term that covers what two subjects?
Unstable & stable angina
myocardial infarction
what are some characteristic of stable angina ?
narrowing but not completely blocked of the blood flow
if someone has stable angina when do they feel the pain ?
when they are moving around
what happens when someone who has stable angina stops moving around ?
the pain stops
what is so great about stable angina?
its reproducible, every time they walk they will have chest pain but once they stop walking, get rids of the pain
what is unstable angina ?
not a complete blockage, but enough blockage that when a patient has high need of oxygen, oxygen and blood flow is not being able to pass through
I know I am in the middle of this flashcards, but a good review back to what we were learning was
ischemia on an EKG looks like ?
injury on an EKG looks like ?
infarction on an EKG looks like ?
sometimes after an ST-segment elevation happens, what can occur?
ST-segment depression and T wave inversion
ST-segment elevation occurs
Physiologic Q wave is the first negative deflection following the P wave
Pathologic Q wave
when someone has unstable angina, when do they feel the pain ?
at rest
does unstable angina ever go away ?
nope, it takes longer to go away, and even become more frequent
what is myocardial infarction ?
heart attack
you can have 2 types of myocardial infarction, which are?
unstable angina and non-st segment elevation myocardial infarction ( NSTEMI )
ST-segment-elevation myocardial infarction (STEMI)
which one is worse, stemi or nonstemi and why?
stemi
- complete blockage
is stemi an emergency and why so?
yes because perfusion is completely blocked!!
is nstemi an urgency and why?
yes because its not completely blocked but like some things are going through
To re-emphaise
NSTEMI VS STEMI
which is worse ?
which one is urgency ?
which one is emergency ?
Which one is total blockage?
Which one is narrowing ?
STEMI
NSTEMI
STEMI
STEMI
NSTEMI
What is the goal for patients of STEMI?
they are back in the Cath lab for revascularzation within 30mins when they walked in the door to the ER
presentation of chest pain
of stem vs NSTEMI
ST elevations they are more likely to be a what?
ST segment depression and T wave inversion, they are more likely to be what?
STEMI ( tombstones! )
UA or NSTEMI
If ST-segment depression and T wave inversion is present or not for NSTEMI, what else can we use to evaluate ?
Serum cardiac biomarkers
Dr. Brooks mentions how labs are not always going to come back quick for patients in critical care, it’s very important to always assume the worst and treat it like it’s the worst thing happening.
Lets think outside the box here, lets see the patient walks into the ER and complains about left sided Chest pain, what other than heart attack can it be ?
Heart failure
anxiety
pulmonary embolism
Pneumothorax
Pneumonia
Bronchitisis
Stress ulcers
GERD
Muscle pain
What are some questions we are going to ask patients when they have chest pain ?
describe the pain
do you smoking
shortness of breath
do you have a cough
when was the last time you ate
palpitations
any medications
any movement with pain
usually in the ER, patients who come in, we have standing labs and medications for patients who come in with Chest pain.
what are some times we are going to do ?
lab wise ? (4)
medication wise ? (2)
troponin levels = heart attack
potassium levels
vital signs
EKG
aspirin and nitroglycerin
what does aspirin do for patients who have chest pain ?
describe the patho
if you are having narrowing in your blood, the aspirin will help thin your platelets and prevent clumping so its easier for the blood to get through that narrow artery
most of the time patients who have stable angina, so the angina that happens when you are moving and stops at rest can develop ____?
unstable angina
to re-emphaize again, what Is unstable angina ?
chest pain that occurs at rest with an increase frequency, duration or less effort to cause than stable angina patterns
unstable angina can be the first clinical sign of what?
CAD
most of the time patients who have unstable angina have pain durations of longer than ?
10 minutes
what does unstable angina show on the EKG and mean?
ST depression and T wave inversion
meaning there is some ischemic changes, so lack of blood flow and oxygen is being able to make it through to the heart
does unstable angina need immediate treatment?
yes
is unstable angina predictable ?
nope
Something very important to restate again is that when patients come into the ER and says they were having Chest pain like yesterday and request and EKG, what happens ?
however what if they are having Chest pain now, what can we see on the EKG?
nothing will show, remember EKG shows the electrical conduction that is being sent to your heart at this VERY MOMENT.
- so if the patient says it happen yesterday the EKG will be normal
so if they are having chest pain now, the EKG will be able to pick it up
to restate again, what does myocardial infarction (MI), heart attack mean?
result of abrupt stoppage of blood flow through a coronary artery with a thrombus caused by platelet aggregation
causing irreversible myocardial cell death ( necrosis )
short
when there is no blood getting to the heart
what are some examples of patients causing/getting an myocardial infarction ?
anemia
losing a lot of blood
high cholesterol
hypertension
family history
heart failure
obesity
males, elderly
its very important to know that most of the time women are less likely to develop a heart attack at a young age for what reason ?
estrogen is protective of the heart!
just to split it up and be able to match, you are going to see which ones are which
STEMI vs NSTEMI
occlusive thrombus
Non-occlusive thrombus
PCI within 12-72hours
ST elevations
Emergency
urgency
PCI or trhombolytic 30-90mins
ST depression and T wave inversion
STEMI
NSTEMI
NSTMI
STEMI
STEMI
NSTEMI
STEMI
NSTEMI
its important to know that if the hospital doesn’t have a Cath lab, if there is a Cath lab that is ______away the patient will be transported.
however if there is not the next thing to do is give the patient ____
120minutes (2hours)
thrombolytic ( clot busting medication )
what is the first line of treatment for STEMI?
cardiac Cath and putting in a stent to help improve blood flow (perfusion)
what is the first line of treatment of NSTEMI?
Cath lab within 3 days, depending on things are going, remember this is urgent but not emergency
what are the 3 main coronary arteries?
right coronary artery
left anterior descending coronary artery
circumflex coronary artery
what are the 4 consequences of total artery occlusion?
O2 and glucose deprivation
heart muscle hypoxic within 10 secs
anaerobic metabolism -> lactic acid -> cellular death
heart cells only viable for 20mins then damage is irreversible
something I want to emphasize a lot on, your heart cells are only alive for ____ if you do now reperfused the body within that time frame, permentaly damage will happen as a consequence of total artery occlusion
20 minutes
if reperfused, aerobic metabolism and contractility restored and cellular repair will begin
what is the side effect of hypertension ?
how does this apply to myocardial infarction ?
left sided ventricular hypertrophy
so your body is already struggling to get blood through the small artery, so your perfusion will be decreased, putting you at a higher risk of developing a myocardial infarction
cardiac output is decreased !!
what is the time Frame that myocardial infarction can happen in ?
takes hours to a few days for a myocardial infarction to occur
what is the first step of the evolution of a myocardial infarction pathophysiology?
ischemia goes from inner to outer layers of the heart and necrosis can occur
what is the time frame of full occlusion of necrosis ?
what is the time frame of partical occlusion of necrosis?
4-6hours
up to 12 hours
how is Myocardial infarction described by ?
location
severity of myocardial infarction is influenced by ?
collateral circulation
the reason why this is important is because as mentioned in the next flashcards, your body will compensate by making collateral circulation, so the more you have these “side roads” the less likely you are to develop permenanet damage because its taking the small vessels instead of the really huge vessels
what is collateral circulation?
when you have heart disease, you typically have some form of narrowing or blockage.
your body will try to grow new vessels and expand to other sides of the heart in order to be able to perfuse well.
she uses a great anagram here
normally you drive on i66 highway, however lets say its 8am with massive traffic, this is your blockage, so what you think will be better is taking the side roads to be able to get to school faster to avoid that traffic.
additional notes regarding this
women are typically often ___and have worse ___
underrated
outcomes
what is the MAIN/classical clinical manifestations of pain of cardiac?
1 then 4 apart of it
crushing chest pain that is left sided or substernal and radiates to the left arm and jaw, accompanied by nausea, sweating, dizziness and shortness of breath.
most of the time clinical manifestation of pain happens during what point of day and for how long ?
early morning and greater than 20mins
if a patient has diabetes, what is the most important thing to know about them when regarding cardiac?
they can have cardiac neuropathy, they won’t even feel a heart attack/ chest pain
lets talk about the SNS stimulation that occurs when patients are having a heart attack
what are we going to see
skin wise?
and why is the skin like this ^
- explain the patho behind and apply it to skin
skin: ashy, clammy and cold to the touch
because of vasoconstriction of peripheral blood vessels. the body is going to be in a flight or fight mode so everything is going to constrict and focus on the core of your body, your organs, so blood is not going to go into your hands and feet as much as your chest area, so thats why your skin around your feet and hands will be presented that way