Cardiology 7.11 Flashcards
HOw wide QRS is tells you
QRS looking at how wide it is - reflection of how long it took signal to propegate through ventricles
if wave front moves other direction what does that do to polarity of QRS
flip it over
if wave front moves other direction what does that do to wave of QRS
widens the QRS
in intensive care or emergency room what is top of list for what you look for
ST segment and T wave
normal sinus rhythm
look at HR: 60 BPM (pg 147)
every p wave followed by QRS
first degree AV block
something is blocking AV node and making signal go slower
draw out example of first degree AV block
pg 147
third degree AV block
can be medical emergency - signal doesn’t get through AV node at all
BP goes way down and CO goes way down
draw out example of first degree AV block
pg 148
CO =
stroke volume x heart rate
what is most dangerous arrhythmia
ventricular fibrillation
draw example of ventricular fibrillation
pg 149
ST elevation
myocardial ischemia: dying cells but might be able to recover them (pg 150)
the electrodes closest to ischemic area do what
give you the most information on what is happening
arrhythmia symptoms
palpitations lightheadedness and presyncope chest pain shortness of breath sudden cardiac arrest: syncope (fainting) & death
what is palpitations
awareness of one’s own heart beat
what is presyncope
what happens before you pas out when you feel light headed and maybe nauseated
most people who die from heart attack die from
ventricular fibrillation
what is bradyarrythmia
decreased firing rate
what is tachyarrhytmia
increased firing rate
how do you get bradyarrhytmia or tachyarrhytmia
altered action potential and altered action potential conduction
tachyarrhythmia HR:
over 100 BPM
bradyarrhytmia HR:
less than 60 BPM
different categoreis for tachyarrhytmia
supraventricular
ventricular
examples of supraventricular arrhytmia
SA node
atria
AV node
examples of ventricular tachyarrhymia
His-Purkinje system, ventricles
general cause of tachyarrhytmia
one or more ectopic foci firing rapidly
re-entrant circuits
ectopic
diferent plave than normal pacemaker and random
re-entrant circuits
the AP is chasing itself like a dog chasing tail - and can happen anywhere in heart
general cause of bradyarrhytmia
impaired automaticity of SA node
escape rhythms involving AV node or ventricles
SVT stands for
supraventricular tachycardia
specific examples of supraventricular tachycardia
sinus tachycardia
atrial fibrillation
atrial flutter
atrioventricular reentrant tachycardia
specific examples of ventricular tachyarrhytmias
ventricular tachycardia
ventricular fibrillation
draw out example of second degree AV block
148
draw out eample of third degree Av block
148
