Final Exam Flashcards
meningitis
infection of the meninges contacted through blood stream; crosses through blood stream
manifestations of meningitis
nuchal rigidity, positive kernigs signs, brodzinskis sign
diagnosing meningitis
CT scan/MRI, lumbar puncture for bacterial culture and gram staining of CSF
CSF aspiration during meningitis
cloudy, low glucose, high protein, high WBC
preventative treatment of meningitis
meningococcal vaccine during high school and college, prophylaxis treatment when in contact with rifampin or ciprofloxacin w/in 24 hours
management of meningitis
antibiotics like vancomycin and cephalosporin, steroids, fluids, seizure precautions with phenytoin
nursing management of meningitis
neuro checks, VS, IOs, labs, daily weights, electrolytes, infection prevention, seizure precautions, pressure ulcer precautions, pneumonia, pt/family education
brain abscess
collection of infectious material within brain tissue; want to prevent otitis media and rhinosinusitis from progressing
findings of brain abscess
headache that is worse in the morning, fever, vomiting, signs of increased ICP
diagnosing brain abscess
MRI and CT scan
nursing management of brain abscess
neuro assessment, meds like antibiotics and steroids, supportive care
3 types of traumatic brain injry
concussion- mild; contusion- moderate to severe; diffuse axonal injury- severe
concussion
mild TBI; sudden trauma induced alteration at alert state; may or may not lose consciousness; small fx, bleed, or swelling may or may not occur
contusion
moderate to severe TBI; bruising of the brain; LOC with stupor and confusion; injury may be present at site of injury or at opposite side; damage to cortex; larger contusions may need to be surgically removed
diffuse axonal injury
severe TBI; deceleration injury with differential movement of brain and skull causing axonal shearing; high mortality rate; immediate onset with no lucid interval; posturing
decorticate posturing
damage to corticospinal tract (cortex lesion); interrupts pathway between brain and spinal cord; rigid extended legs, pointed and turned in toes, arms bent toward center of body, curled wrists and balled hands against chest
decerebrate posturing
severe injury to the brain at the level of brain stem; poor prognosis; rigid extended legs, pointed and turned in toes, flexed wrists, curled fingers, straight tense arms parallel to body
brain death
absence of brainstem reflexes and apnea; irreversible condition; coma is different due to distinguishable presence of brain stem response such as spontaneous breathing and reflexes
spinal shock
occurs immediately after injury (24hrs-6 weeks following); complete but temporary loss of motor function, sensation, and autonomic activity; brain unable to transmit signals to muscle and organs
treatment of spinal shock
spinal stabilization, maintain ABCs, PT, OT
clinical manifestations of spinal shock
flaccid paralysis, clonus is fist sign, no DTR, low visceral and somatic sensations, anhidrosis, paralytic ileus
cushings triad
HTN/widened pulse pressures, bradycardia, irregular breathing pattern; sign of brain injury
neurogenic shock
acute injury to brain, cervical, or thoracic spine; causes distributive shock d/t loss of autonomic nervous system and control of blood vessel
patho of neurogenic shock
loss of SNS tone, massive vasodilation and venous pooling, hypotension, low perfusion, cell death; occurs 30 minutes up to 6 weeks after injury
clinical manifestations of neurogenic shock
hypotension, bradycardia, poikilothermia (irregular temp), anhidrosis
treatment of neurogenic shock
spinal stabilization, vasopressors, atropine, pacemaker
mitral and aortic valve stenosis
valves do not completely open reducing blood flow through valve; thickened and stenotic valve leaflets
mitral and aortic valve regurgitation
valves do not completely close causing backflow of blood through valve
effects of mitral valve stenosis
reduced cardiac output; rising pressure in left atrium; left atrium hypertrophy and pulmonary congestion
effects of aortic valve stenosis
left ventricle hypertrophys
effects of mitral valve regurgitation
allows blood from left ventricle to left atria; reduced cardiac output; hypertrophy of left ventricle d/t pumping harder
mitral valve prolapse
part of one or both valve leaflets collapse back into the left atrium
symptoms of mitral valve prolapse
palpitations, chest pain, fatigue, dizziness, shortness of breath
types of valve repairs
valvuloplasty- valve repair and reconstruction done minimally invasive; commissurotomy- repair to stenosed mitral valve, fused commissures are incised
types of valve replacements
prosthetics consist of mechanical- long term disability, risk for thrombi/emboli, risk for infection, require lifelong antibx; biologic- durability <10yrs; homograft- human but limited availability; all procedures done if valvuloplasty cannot be done
cardiac tamponade
compression on the heart due to excessive fluid in pericardium; auscultate at PMI; treat with pericardiocentesis
assessment of valve disorders
decreased cardiac output and decreased cerebral perfusion; syncope with exertion; pulmonary edema; dyspnea; tachypnea; tachycardia; chest pain
diagnosing valvular disorders
TEE, echocardiogram, murmur auscultated d/t turbulent blood flow
treatment of valvular disorders
want NSR and avoid AFib; control HR with BB and CCB; valve repair
treatment of Afib
amiodarone and cardioversion
treatment of HF
diuretics and sodium restriction
heart failure
aka dilated cardiomyopathy; prone to dysrhythmias, valve dysfunction; causes sns stimulation to increase BP and narrow arteries and increase workload
signs and symptoms of dilated/HF
SOB on exertion, fatigue, weakness, cough while lying, orthopnea, chest pain, cardiomegaly, fluid retention, nausea. palpitations, syncope with exertion, S3 heart sound
diagnosing HF
echo to visualize and calculate ejection fraction, EKG, stress test, CXR, MRI, CT scan, cardiac cath lab, B natriuretic peptide (BNP)
treating HF
diet- sodium restriction; telemetry- monitor rhythms; meds like anticoagulants and antiplatelets; biventricular pacing; surgery
anticoagulants used for cardiac treatments
apixaban (eliquis), warfarin, rivaroxaban (xarelto)
antiplatelets used for cardiac treatments
aspirin, clopidogrel (plavix)
order of electrodes
salt pepper meat lettuce tomato; white pt top right, black pt top left, brown in middle sternum, green pt bottom right, red pt bottom left
electrical conduction system within heart
SA node is primary pacemaker and initiates atrial contraction, travels to AV node which is backup pacemaker and acts to depolarize atria and slow impulse, then atrial contraction begins and conduction travels to heart apex, then travels to bundle of his and bundle branches, then travels to purkinje fibers and through ventricular myocardium, causing ventricular contraction
moving from negative to positive (top to bottom)
causes positive deflections on 12 lead
P wave
atrial contraction (depolarization)
PR interval
from beginning of P wave to beginning of QRS; should be 0.12-0.2 sec
PR segment
from end of P wave to beginning of QRS complex; movement of electrical activity from atria to ventricles; impulse is held in AV node leading to isoelectric line
QRS complex
ventricular contraction (depolarization); should be 0.06-0.12 sec
ST segment
end of S wave to beginning of T; time between ventricular depolarization and repolarization
T wave
ventricular relaxation (repolarization)
QT interval
from beginning of QRS to end of T wave; time from beginning of ventricular contraction until ventricular repolarization; should be <0.4 sec
TP interval
end of t wave to beginning of P wave; ventricles are relaxing and filling
absolute refractory period
time where tissue cannot conduct any electrical impulse; QRS to T
EKG measurements
each box is 0.04s, each big box is 0.2 s, 5 large boxes is 1s, each strip is 6s
method of interpreting EKG
- measure the rate; 2. examine R-R interval to see if regular or irregular; 3. examine the p wave (constant, one for every QRS, upright); 4. measure PR interval; 5. is P wave followed by QRS; 6. Examine and measure QRS complex (wide or short); 7. measure QT interval; 8. identify the rhythm
sinus bradycardia
less than 60 bpm, regular R-R, upright regular and matching P wave; P wave precedes QRS
treatment for sinus bradycardia
speed up heart; atropine 0.5mg, dopamine, pacemaker
types of pacemakers
temporary- transcutaneous, transvenous, epicardial; permanent- pacemaker, implantable cardioverter defribrillator, biventricular pacemaker
atrial pacemaker spikes and ventricle pacemaker spike
atrial PM pacer spike occurs before P wave; ventricle pacer spike occurs before QRS (QRS will be wider if paced and that is normal)
sinus tachycardia
rate > 100 and <140; R-R interval is regular; P wave is regular upright and matching; P wave precedes QRS
treating sinus tachycardia
fluids, O2, fever, pain, rest; meds like beta blockers (metoprolol)
atrial fibrillation
irregular R-R interval; P wave is undistinguishable; unable to calculate PR interval; cannot identify if P wave precedes each QRS; QT interval cannot be determined
concern/problem with atrial fibrillation
loss of atrial kick which causes hypotension and blood stasis
atrial fibrillation RVR
rate greater than 110
treating atrial fibrillation
beta blockers, calcium channel blockers, digoxin, amiodarone (not as commonly used); all used to slow conduction from SA to AV node
atrial flutter
regular R-R interval; P wave cannot be distinguished but can see flutter “sawtooth”; cannot calculate PR interval; cannot identify if P wave precedes each QRS; QT interval cannot be determined
concern with atrial flutter
loss of atrial kick and blood stasis; not as bad as Afib; one spot of atria is misfiring
supraventricular tachycardia
rate is > 140; regular R-R interval; unable to identify P wave; cannot calculate PR interval; cannot identify if P wave precedes each QRS; unable to identify QT interval; fast and skinny; cannot distinguish between P and T waves
treating SVT
want to convert and slow; vagal maneuver, carotid massage, medications or cardioversion; adenosine
adenosine
1st line therapy for SVT when vagal does not work; given rapidly over 1-2 sec; temporarily inhibits AV node conduction and blocks to reset HR
ventricular tachycardia
extremely widened QRS; R-R interval is regular; P wave is undistinguishable; no PR interval; P wave does not precede each QRS; unmeasurable QT interval
cardiac tamponade on EKG
crescendo then decrescendo then crescendo; types of Vtach; treat with magnesium and peridcardial centesis
treating Vtach
stable with pulse- O2 therapy, antiarrhythmics like amiodarone, synchronized cardioversion; unstable without pulse- CPR, ACLS protocol for defib., possible intervention, drug therapy like epi vaso and amiodarone
ventricular fibrillation
complete loss of contraction; R-R interval is undeterminable; no p wave; PR interval is not calculable; P wave does not precede each QRS; no QT interval;
treating ventricular fibrillation
defibrillate; meds like epi and amiodarone
asystole
complete cessation of hear electrical impulses in heart; pt is pulseless and unconscious; treat with CPR and meds (no defib)
pulseless electrical activity
electrical activity shown on EKG but no pulse present; need to reverse underlying cause; treat with CPR and epinephrine
etiology of PEA
H’s and T’s; hypovolemia, hypoxia, hydrogen ion (acidosis), hypo/hyperkalemia, hypoglycemia, toxins, tamponade, tension pneumo, thrombosis, trauma
premature ventricular contraction
can be completely normal; 3 in a row is considered Vtach; can be electrical or actual contraction; does not add to cardiac output; treat by monitoring and if frequent notify physician
elective cardioversion
admin electrical current synchronized with patients heart rhythm; ised to treat SVT, AF, Aflutter, Vtach with pulse that is med resistant; 50-150 joules x3
R on T phenomenon
administering cardioversion on T wave tat can cause and lead to lethal arrhythmias
digoxin
+ inotropic effect to increase squeeze; - dromotropic effect that slows impulses in AV node; - chronotropic effect causing to beat slower
mechanical circulatory support for HF
ventricular assist device, intra-aortic balloon pump
acute respiratory distress syndrome
severe form of respiratory failure; rapidly progressive hypoxemia; alveolar capillary injury; damage to endothelia lining of alveolar membrane increasing permeability; plasma and proteins leak from capillaries into interstitial spaces and alveoli that causes damage, reduces lung compliance, lung volume, and normal gas exchange; most fatal within 24-48 hrs
common etiology of ARDS
aspiration of gastric contents, pneumonia, covid, shock of any etiology, sepsis