CSCT Exam Review Flashcards
what conditions can alter ST segment causing false-positive ST changes
body position
hyperventilation
digoxin, quinidine
LVH
pre-exitation
smoking
conduction system abnormalities
what is NOT a frequent or severe side effect of Beta adrenergic blocking agents
thyroid dysfunction
what would be used to treat a pt with nocturnal angina
beta blockers and nitrate therapy
identify the modified chest lead that is most useful in detection of ST segment change due to ischemia
modified lead 5
most common cyanotic congenital heart defect IN infancy
transposition of the great vessels
3 cardiac defects that obstruct LV and RV outflow
aortic stenosis
pulmonary stenosis
coarctation of the aorta
which of the following is not a Class I antiarrhythmic:
quinidine, diltiazem, procainamide, mexeletine, propanolol….
diltiazem
which classification of antiarrhythmics has the primary effect of slowing the AV conduction
Class IV calcium channel blockers
most common side effect of amiodarone
pulmonary toxicity
T/F - by the time a child is 3-8 y/o, the precordial leads will assume the adult QRS pattern
True
T/F - episodes of sinus tachy/brady lasting longer than 15s is abnormal
True
it can be said that most children who develop SVT have…
no associated cardiac disease
the most common form of congenital heart disease
VSD
the most common cyanotic congenital heart disease BEYOND infancy
tetralogy of fallot
the danger of PVC’s in the presence of ischemia heart disease or cardiomyopathy is that they maybe the forerunner to…
sudden death, onset of VT/VFIB
the danger of R on T is the potential of the development of
VT or VFIB
what 3 drugs are associated with the development of torsades
quinidine, disopyramide, and trycilic antidepressants
2 most common rhythm disturbances than can cause onset VFIB are
PVC and VT
T/F - when the ventricles are fibrillating the heart muscle is able to eject only a small volume of blood
False, no circulation or even a small amount of blood
aberrant ventricular conduction may either be RBB or LBB, although most of the time its _______
RBBB
AFIB and PAC’s frequently are conducted w/ aberrancy bc aberrant ventricular conduction occurs due to a _____ cycle length
shortening
T/F - QRS duration of a normal newborn is less than in adults
True
T/F - T waves in V1 are upright throughout childhood as well as adulthood
False, T waves are usually inverted in childhood in V1
T/F - amplitude of the R wave in V1 is usually greater than the S wave in V1 in an infant of less than one month
True, they are more dominant in the RV
mechanism in sinus arrest is depression of impulse _____ and mechanism of sinus block is depression of impulse ______
formation, conduction
if the pause in the rhythm is a multiple of the P-P interval, the diagnosis is
sinus block
the passive rhythm that develops in complete AV block may originate from an _____ focus or a ______ focus
idiojunctional, idioventricular
WPW syndrome can occur if the anomalous accessory pathway called the _______ exists.
bundle of kent
the rapid rate caused by WPW can cause the risk of development of
VFIB
will vagal maneuvers be effective in WPW
No
will WPW respond to cardioversion
Yes
what drug therapies may be used in WPW (8)
quinidine
procainamide
disopyramide
aprinidine
amiodarone
encainide
propaferone
sotalol
AV re-entry tachycardia caused by WPW may be treated with (6)
digitalis
propanolol
diltiazem
amiodarone
verapamil
encainide
structures of the conduction system innervated by the PNS
SA node, AV node, atria
3 methods by which ions may move across a cell membrane
diffusion
osmosis
active transport pumps
what part of the action potential curve represents cell activation or depolarization
phase 0
which cell possess spontaneous diastolic depolarization
SA node, AV junction & purkinje’s
which cell has the LEAST negative RMP
SA node
which cardiac cell has the most perpendicular phase 0 slope
ventricular myocardium
which cardiac cell typically has the steepest rise in phase 4
SA node
which cardiac cell typically has the longest refractory period
purkinje cell
atrial depolarization is
posteriorly, downwards and to the left
depolarization in the ventricular septum is
from left to right, anteriorly to inferiorly
late depolarization of the ventricles
to the left, posteriorly and superiorly
normal septal depolarization is from
left to right
what conditions cause enhanced automaticity
hypokalemia
hypocalcemia
dig toxicity
fever
hypoxia
trauma
MI
atrial flutter is believed to be most commonly due to
intra-atrial re-entry
2 passive escape rhythms
junctional and idioventricular
Name 3 areas of the conduction system where a block can occur
SA node, AV node, bundle branches
has a phasic variation of rate due to changes in vagal tone typically affected by respiratory cycle
sinus arrhythmia
what is the most controllable function of the ECG
output
3 main differences between single and multichannel ECG
- all precoridal leads must be connected at the same time
- when tracing is complete it doesnt need to be mounted
- cost and time effective
define voltage
amount of pressure in an electrical loop which is measured in volts (V)
what can increase when the ECG is subject to corrosive and humid environments
leakage current
what is the function of the fat prong or neutral pin
provides a direct path back to the power source
define bipolar leads
a recording of electrical differences between 2 points of reference
what is einthovens law
sum of amplitude of the recorded complexes in Lead I and Lead III is = to amplitude recorded in Lead II
where is zero potential located
center of the heart
recording the third dimension of the heart is the function of the
chest leads
the small bump felt where the manubrium meets the sternal body is known as the
sternal angle
what are the qualities of a technically and clinically acceptable ECG
standardization - 1mV 10mm High
Clarity - visible deflection
Baseline - constant
Leads - approx. 3-6 complexes
Tracing - centered, coded and labelled
Causes of single artifact
loose electrode connection
lead switch over
operation induces static electricity
metallic particles in skin or in electrode cream
surgical implanted metal plate or screw
causes of wandering baseline
muscle tension
pt. not comfortable
pt. physical or mental condition
tech incomplete patient prep/attitude
Causes of somatic tremor
lack of relaxation
poor electrode contact
loose electrode connection
breathing
conversation
cable swinging/dangling
An invasive procedure using a unipolar lead to identify atrial activity or P waves
esophageal lead
emergency procedure to terminate VFIB or VT
defibrillation
used to diagnose and correct SVT caused by re-entry
vagal maneauvers or carotid massage
Some conditions where it may be impossible to acquire the exact anatomical position of the precordial leads
chest or thoracic surgery
chest trauma
presence of skin growth
monitoring equipment
when should a rhythm strip be obtained for evaluation of arrhythmias
HR below 40BPM
multifocal or frequent ectopy
any pt. who is not in sinus rhythm
when should double standard be used
voltage is too low
conditions associated w/ tamponade
trauma
infection
post CPR
neoplastic dx
myocardial rupture
post cardiac surgery
why is a 15-lead ECG done
posterior & RVMI
define electrocardiography
process of recording the variations of electrical potential produced by the heart
who published the first well known textbook of electrocardiography
thomas lewis
who invented the first sensitive and reliable instrument for measuring and recording cardiac potential
William Einthoven
What decade was the first portable ECG available?
1950
Name 3 basic functions of the ECG
input
output
signal averaging
Electrical signal collected by the ECG is amplified by ____ before it is transmitted to the galvanometer
20 000 000 000
Resting potential of a pacemaker cell
-60mV
resting potential of a cardiac cell
-90mV
Ashmans beat
a premature beat with a RBBB morphology
what BBB has the longest refractory
RBBB
Irregular rhythms
Sinus arrhythmia
WAP
MAT
AFIB
VFIB
Baye’s Theorem
describes the probability of an event, based on conditions that may be related to the event
2 main effects to sodium-channel blocker poisoning are:
seizures
ventricular dysrhythmias
What coronary artery supplies the Sinus node
RCA
what coronary artery supplies the AV node
90% RCA and 10% LCA
what coronary artery supplies the atria
RCA and LCA
what coronary artery supplies the right ventricle
RCA
what coronary artery supplies the left ventricle
LCX and LAD
Layers of the heart
epicardium
myocardium
endocardium
Most common cause of CAD
athlerosclerosis
S1 resembles
tricuspid and mitral valves closing
S2 resembles
semilunar valves closing
Galvanometer
amplifies current
5 nonpathological conditions for ECG changes
less than 30 years
advanced age
large body
athletes
thin women
Bachmans bundle is the _______ conduction system
inter-atrial
State the conduction system in order
SA node
internodal pathways
AV node
Bundle of His
Left bundle
right bundle
Purkinje fibres
Major ECG sign of an anterior wall infarction is
loss of normal R wave progression in the chest leads
SVT and PAT are the same. Treat with _______
Adenosine
What is the more common fasicular block?
LAFB
Fasicular blocks caused the ventricles to be…
innervated asynchronously and aberrantly
Intrinsicoid Deflection
amount of time it takes the electrical impulse to travel from purkinje -> endocardium -> epicardium under an electrode
RCA is dominant in ____ and Cirumflex is dominant in ___
90% and 10%
Hyperkalemia
suppression of SA node
reduces conduction of AV node/HIS system
Causes bradycardia, conduction blocks, cardiac arrest
Treat Prinzmetals angina w/
treat with nitrates and calcium channel blockers
Swelling or edema throughout the body
Anasarca
bifasicular block
RBBB combined with LAFB or LPFB
trifasicular block vs incomplete trifasicular block
Bifascular block + 1st or 2nd degree AV block
incomplete: Bifascicular block + 3rd degree AV block
Takotsubo syndrome
can be triggered by an intense emotional or physical stress. It causes sudden chest pain or shortness of breath. The symptoms of TCM can look like a heart attack.
Dilated cardiomyopathy
ECG changes include atrial and ventricular hypertrophy
Most common
Hypertrophic cardiomyopathy
usually genetic disease, can lead to sudden death bc of VT and VF, needs ICD
Restrictive cardiomyopathy
stiff and fibrotic ventricles, reduced compliance, usually needs transplant
ECG changes include low voltage QRS, Q waves, BBB, AVB
LEAST common
3 Stages of athlerosclerosis
development of fatty streak
plaque progression
plaque distribution
After an MI, go home w/
Beta blockers
ACE inhibitors
ASA (antiplatelet)
Statins
Heparin
inhibits thrombin, antidote is protamine sulphate
Warfarin
antidote is vitamin K
Persantine
anti-anginal agent and anti-platelet agent, antidote is aminophylline
INR
International Normalized Ratio
the time it takes normal blood to clot and coumadin blood to clot. Coumadin should have an INR btw/ 2-3
Alteplase
most effective if administered ASP following indications of a clot
Steptokinase
similar to alteplase but does not have any affinity for clots
If a lead conductor was partially fractured…
Impedance/resistance would inc.
Current would dec.
Battery energy would be conserved.
Complete fracture
infinite impedance and no current flow
Fractured conductor while insulation remains in tact
Resistance/impedance will inc.
Normal lead impedance values
300-1000 ohms.
Unipolar
lead tip to can
Bipolar
lead tip to ring on lead
Programming a lower sensitivity value in mV causes the pacemaker to do what?
become more sensitive to signals
Pacemaker implantation
generally implanted subcutaneously under the pectoral muscle in the infraclavicular region
Uses subclavian, internal/external jugular, and cephalic veins
Magnet response
Prevents sensing, resulting in asynchronous pacemaker operation
Allows assessment of pacemaker function during inhibition
Causes of Loss of Capture (7)
Lead dislodgement
Lead insulation break
lead wire fracture
battery depletion
electrical circuit failure
Pacing/sensing programmed too high/low
Pacemaker/lead connector issues
S3
Associated with CHF
S4
Associated with hypertrophy
What occurs during pulseless electrical activity
it is not palpable
What drugs does someone NOT need after leaving the hospital with a stent
anticoagulant, ace inhibitors, beta blockers and CCB
What phase does the ST segment represent
phase 2
Which stage would torsades be triggered at
Phase 3 (R on T)
Osborn J waves
Hypothermia
What rhythms do we NOT cardiovert?
VF
What MI is most commonly associated with death
Anterior
What 3 things close after birth?
Ductus arteriosus, ductus venosus, foramen ovale
What would happen in arm lead reversal?
P, QRS would be upright in AVR
Negative QRS in Lead I
What artery supplies the LATERAL leads
Circumflex
What artery supplies the INFERIOR leads
Right coronary artery
What artery supplies the ANTERO-SEPTAL leads
Left anterior descending
Long QT
hypocalcemia
hypokalemia
hypomagnesia
class ia and III antiarrhythmics
tricyclic antidepressents
CNS trauma
ischemia, myocarditis
What 2 congenital defects cause long QT
Romano-ward
Jervell-Lange-Nielsen
Hyperacute
ST elevation only
Acute
Significant Q wave and ST elevation
Old
Significant Q waves
Wenckebach & grouping
2nd Degree AV block type I
Requirements for re-entry
2 different pathways for conduction
conduction is slowed in one of the pathways and failure of conduction
conduction is slower than normal in the unblocked pathway
Examples of re-entry arrhythmias
AVRT
AVNRT
SVT
AFlutter
AFIB
VT
VF
What supplies the inferior wall of the left ventricle
RCA
What supplies the septal wall
LCA
What supplies the anterior wall of the LV
LCA - LAD
What supplies the lateral wall of the LV
LCA - Circumflex
Indications for ICD
VT/VF survivors w/ irreversible etiology
Sustained VT w/ structural heart disease
Syncope with VT/VF
LV ejection fraction of <35%
Post MI LV EF of <30%
Post MI LV EF of <40% with VT/VF
What is CHADS
a scoring system used by healthcare professionals to calculate a patient’s risk of having a stroke secondary to atrial fibrillation.
Congestive heart failure
Hypertension
Age
Diabetes
Stroke
Antidromic Tachycardia
Conduction goes down the accessory pathway and back up through the AV-node, causes retrograde conduction - wide QRS
Orthodromic Tachycardia
Conduction goes through the AV node and then back up through the accessory pathway (normal conduction), causes antegrade conduction - narrow QRS
Elevated cardiac enzymes
CPK, SGOT
What is in blood
platelets, serum, plasma (enzymes in plasma)
Subarachnoid Hemorrhage
will have deeply inverted T waves
Atrial flutter
one ectopic site in the atrium is firing, usually right atrium in an area called Crista Terminalis
runs counter clockwise
Stokes Adams Attack
Periods of syncope due to CHB (loss of consciousness)
Pacemaker Class 1 Indications
3RD DEGREE & ADVANCED SECOND DEGREE AVB:
➢ Symptomatic bradycardia due to AV Block
➢ Documented periods of asystole >3 seconds in duration
➢ Escape rate of <40 bpm while awake; symptom free patients
➢ Post AV junction ablation
➢ Post-OP AVB not expected to resolve
➢ 2nd degree AVB regardless of type or site with associated symptomatic bradycardia
Electrical Alternans
Pericarditis
Pericardial effusion
pulmonary embolism
cardiac tamponade
Dobutamine
used to treat shock
Aortic Regurgitation
Can also be called Water Hammer Pulse because the diastolic BP will decrease in the aorta and pulse pressure will widen
4 Components of TOF
VSD
Pulmonary stenosis
Overriding Aorta
RVH
Coronary Perfusion
epicardium to endocardium, ischemia will impair BF to subendocardial layer first
3 Major determinants of O2 Demand
Ventricular wall stress
HR
Contractility
Trendelenburg
the body is lain supine, or flat on the back on a 15–30 degree incline with the feet elevated above the head.
what test is least commonly ordered for CAD in CHF patients
regular gxt (stress test)
Cheyne-strokes
abnormal pattern of breathing characterized by progressively deeper, and sometimes faster, breathing followed by a gradual decrease that results in temporary stop in reaching called apnea. the pattern repeats with each cycle usually taking 30 sec - 2 minutes
Cheyne-strokes is linked to HF + strokes
Sgarbossa Criteria
Concordant ST elevation > 1mm in leads with a positive QRS complex
Concordant ST depression > 1 mm in V1-V3
Excessively discordant ST elevation > 5 mm in leads with a -ve QRS complex
What mode should be used for a pt. with AFIB
VVI or VVIR
Pulseless Electrical Activity
7 H’s
7 T’s
Hyperkalemia
Hypoxia
Hypothermia
Hydrogen Ion access
Hypovolemia
Hypoglycemia
Tamponade
Tension Pseumothorax
Thrombosis (Pulmonary embolus)
Thrombosis (MI)
Toxins
Trauma
ICDS:
What stores energy?
capacitor
Arrhtyhmias caused by re-entry (4)
SVT, VT, Afib, AFlutter
Impulse formation disorders (3)
sinus arrest
sinus brady
brady/tachy
Impulse conduction disorders (2)
exit block, AV block
Causes of LVH
hypertension
aortic valve stenosis
hypertrophic cardiomyopathy
athletic training
RAE causes
COPD
pulmonary embolism
pulmonary hypertension
mitral, tricuspid, pulmonary valve disease
LAE causes
LV failure
restricted cardiomyopathy
HTN
aortic/mitral valve disease
What is seen with LAE
LBBB
LVH
LAFB
What MI is most associate w/ death
Anterior (LAD)