Week Four Modules Flashcards
why would you perform an EKG on a patient pre-operatively?
if there is a rhythm change in the patient or if the patient is having chest pain
a normal electrical impulse begins in the _____ which is located in the _____ near the entrance of the vena cava
sinoatrial (SA) node; upper right atrium
the SA node is known as the ______ of the heart
pacemaker
what is happening during the “P-Wave”? of an ECG?
atrial depolarization (the two atria are contracting)
the ___ is the second pacemaker of the heart and can initiate a _____ if the SA node does not fire
atrioventricular (AV) node; heartbeat
the _____ transmit an electrical impulse to the ventricles causing them to ____ which is known as the ______
purkinje fibers; contract; QRS complex
p wave = _____
p-r interval = ______
qrs complex = ______
atrial depolarization;
represents the movement of the impulse through the atria, AV node, and bundle of His/Purkinje fibers
represents ventricular depolarization of both ventricles
st segment = _____
t wave = ______
qt interval = ______
represents time between ventricular depolarization and repolarization
represents time for ventricular repolarization
represents the time for the entire ventricular depolarization and repolarization
how long should the p-r interval last?
how long should the QRS complex last?
how long should the ST segment last?
.12-.20 seconds;
usually between .04-.06, but less than 0.12 seconds;
.12 seconds
how long does the T wave usually last?
.12 seconds
if the QRS complex is wide what might this suggest?
it’s important to remember that the ST segment should always be _____ (on the baseline)
right or left bundle branch block;
isoelectric
a prolonged QT interval could trigger a ________ also known as torsades de pointes
polymorphic ventricular tachycardia
what are the seven steps of rhythm analysis?
determine the rate; is the rhythm regular/irregular; analyze the p-waves; measure the PR interval; measure the QRS complex; measure the QT interval; then interpret the rhythm
how can you determine if the rate is regular/irregular in a ECG strip?
you can do this by counting the number of small boxes between the start of one R wave to the next R wave
for it to be considered “regular” the distance from one R wave to the other needs to be the same
what are the requirements for a patient who has a basic sinus rhythm?
hr is within normal limits, p wave is present, pr interval is within normal limits; qrs complex is within normal limits; and qt wave is within normal limits
what are the requirements that need to be met in order for the patient to have sinus bradycardia?
hr is <60 bpm, regular rhythm, p waves present, pr interval within normal limits, and qrs within normal limits
what are signs and symptoms of a patient who has bradycardia?
patient may have symptoms of inadequate perfusion like fatigue, dizziness, chest pain, hypotension, or syncope
something to remember is that some patients may have asymptomatic bradycardia if they are ____, who often “brady down” during sleep
trained athletes
bradycardia can also happen if the patient is taking a _____. if the patient is showing symptomatic signs of bradycardia due to the drug then their dosage may need to be ______
beta blocker; reduced
if you’re on the telemetry floor and you notice that your patient is is showing signs of symptomatic bradycardia what would you do?
assess the patient; go into the patient’s room and say “hi there. i came to see how you’re doing since your heart rate is a little low. are you feeling lightheaded or dizzy?”; afterwards, you’ll take a set of VS and if the BP is low/patient is experiencing symptoms, you’ll want to call the provider
if you’re on the telemetry floor and one of your patients is stable and asymptomatic but they are experiencing bradycardia what would you do?
text/page the provider and let them know what’s going, especially if this is a change from their normal heart rate.
what are some treatment options for bradycardia?
sometimes atropine is used to increase the HR if the patient is symptomatic
transcutaneous pacing, where there is an electrode that is placed on the patient’s skin which can capture the patient’s HR
it’s important to remember that transcutaneous pacing is a ______ until the patient can have a permanent pacemaker placed
temporary fix
what are the requirements the patient needs to meet in order to be diagnosed with sinus tachycardia?
HR is somewhere between 101 - 180, regular rhythm, p wave is within normal limits, pr is within normal limits, qrs is within normal limits
what are signs and symptoms of tachycardia?
fever, pain, hypotension, hypovolemia, or hypoglycemia
medications like _____ or ______ are also known to cause tachycardia
epinephrine; pseudoephedrine
tachycardia can also result from things like _____, _____, and ______
exercise; anxiety; fear
if the patient on your telemetry floor is experiencing sinus tachycardia what would you do?
go to the room and assess the patient; ask them if they’re feeling dizzy or short of breath; take a set of VS and call the provider
what are some treatment options for sinus tachycardia?
first thing first, you want to treat the underlying cause
for example, if the patient has a fever, place a cool cloth on their forehead, use ice bags, and look for a PRN order of acetaminophen (325-650mg)
sometimes, young _____ patients will have unexplained tachycardia and have a HR in the ___
why does this happen?
male trauma; 120s
because the patient is already in a hypermetabolic state as the body is trying to heal from its wounds
once all other causes have been ruled out in sinus tachycardia, only then will the doctors prescribe a medication such as _____, a _____ to help reduce the metabolic demand of a high heart rate
propranolol; beta blocker
premature atrial contractions are contractions that come from an ______ (a place other than the AV node) in the atrium _____ than ____
ectopic focus; sooner; expected
when looking at an ECG you’ll be able to see premature atrial contractions where?
premature atrial contractions will display themselves on the R waves
often times, you’ll see that each R wave will come earlier than expected
what are some signs and symptoms of premature atrial contractions?
PACs can result from emotional or physical stress, caffeine/nicotine use, or alcohol use
patients will often report feelings of palpitations or a “skipped” heart beat
what are some treatment options for premature atrial contractions?
withdrawal of stimulants such as caffeine can help to reduce PACs
use of beta blockers can also help decrease PACs
how are premature junctional contractions treated?
the same way as PACs are treated
withdrawing any stimulants or using medications such as beta blockers
what causes premature junctional contractions?
they happen due to the SA node not firing so the AV node has to become the pacemaker
what causes an atrial flutter?
atrial flutter is an atrial tachydysrhythmia that results from a single ectopic foci in the atrium
what are some signs and symptoms of atrial flutter?
this will typically occur in patients who have coronary artery disease, COPD, or cor pulmonale
can also happen if the patient is taking digoxin or quinidine
patient may complain of things like lightheadedness or low blood pressure
patients who have a-flutter are also at a high risk of developing _____ that form in the atria
blood clots
often times, patients with a-flutter will be prescribed _____ to prevent clot formation
warfarin/coumadin
what is the primary treatment goal for patients who have a-flutter?
slow down the ventricular rate by increasing the AV block
what kinds of medications are known to increase the AV block?
calcium channel blockers and beta blockers are known to increase the AV block
_____ tends to be the treatment of choice for a-flutter patients which involves inserting a ___ into the right atrium
a _____ of electricity is then used to “ablate” or destroy the ectopic foci
ablation; catheter
low voltage
what causes atrial fibrillation to occur?
results from total disorganization of atrial electricity activity from MULTIPLE ectopic foci
a-fib is one of the most _____ dysrhythmias
common
a-fib is an ____ rhythm
irregular
what are some underlying causes that can also cause atrial fibrillation to occur?
a-fib can also result due to things like heart disease, heart failure, electrolyte imbalances, and stress
what is considered “controlled” a-fibrillation?
what is considered “uncontrolled” a-fibrillation?
when the patient has a HR between 60 and 100
when the patient has a HR that is greater than 100
a-fib is similar to a-flutter as it results in loss of an atrial kick which can cause decreased cardiac output and can manifest itself as ______, _____, _____, and ____
hypotension, weakness, palpitations, and fatigue
patients who are prescribed coumadin/warfarin will need to have PT/INR drawn in order to titrate Coumadin
what is considered a “therapeutic level” of INR?
INR is considered to be therapeutic when it is between 2-3 seconds
can coumadin be prescribed to help treat patients with A-fib?
yes
what is one of the first treatment goals when it comes to treating a-fib?
control the HR, meaning the rate needs to decrease and be around 100 bpm
if a-fib is treated in the hospital, the patient may receive _____ for a total of 3 doses that are five minutes apart
5 mg IVP metoprolol
in order to receive metoprolol in the hospital, the patient must be on a ______
telemetry (heart) monitor
if a-fib is resistant to the med pushes of metoprolol and the heart rate remains high, the patient will then be placed on _____ or ______ drip, that will run continuously
amiodarone; diltiazem
what is the maximum dose of diltiazem that can be given?
20 mg/hr
remember: diltiazem _____ works; whereas, amiodarone _____ works
sometimes; almost always
if the patient is suffering from a-fib, vital signs should be done at least once every ____ hours
4
if the patient has decreased tolerance for medications, what would be the next best solution?
placing the patient on cardioversion or ablation