Cardiovascular Flashcards
What two structures does the truncus arteriosus give rise to?
ascending aorta and pulmonary trunk
What does the bulbus cordis give rise to?
smooth muscle outflow tract of left and right ventricles
What does the primitive atria give rise to?
trabeculated part of left and right atria
What does the primitive ventricle give rise to?
trabeculated part of left and right ventricle
What does the primitive pulmonary vein give rise to?
smooth muscle part of left atrium
What does the left horn of the sinus venosus give rise to?
coronary sinus
What does the right horn of the sinus venosus give rise to?
smooth muscle part of right atria
What two structures make up the superior vena cava?
right common cardinal vein
right anterior cardinal vein
By how many weeks into embryological development does the heart begin beating?
4 weeks
What protein is defective in Kartagener Syndrome?
Dynein
What is the name of the structure that embryologically connects the left and right atria?
foramen primum
What structure originally separates the left from the right atria?
foramen primum
What structure forms in the septum primum?
foramen secundum
What develops as the foramen secundum maintains the left to right shunt?
septum secundum
What structure is left over after the septum secundum covers the foramen secundum?
foramen ovale
What structure forms the valve of the foramen ovale?
septum primum
What two structures fuse to form the atrial septum?
septum primum and septum secundum
What causes a patent foramen ovale?
failure of septum primum and septum secundum to fuse
What can a patent foramen ovale lead to?
paradoxical emboli
Does a VSD most commonly occur in the muscular or membranus septum?
membranus
What two ridges fuse to form the aorticopulmonary septum?
bulbar ridges and truncal ridges
What are the aortic and pulmonary valves derived from?
endocardial cushions of the outflow tract
What are the mitral and tricuspid valves derived from?
fused endocardial cushions of the AV canal
What is Ebsteins Anamoly?
tricuspid valve leaflets are attached to RV
What weeks does hematopoiesis occur in the yolk sac?
3-8 week
What weeks does hematopoiesis occur in the liver?
6th week to birth
What weeks does hematopoiesis take place in the spleen?
10th - 28 weeks
What weeks does hematopoiesis occur in the bone marrow?
18 weeks to adult
What is the PO2 of blood in the umbilical vein?
30 mm Hg
What would a pulse oximeter of fetal blood read?
80%
What vessel supplies oxygenated blood to the fetus? What vessel does it join?
ductus venosus
IVC
Upon reaching fetal circulation, where does most of the oxygenated blood go? Via what structure?
head
foramen oale
Upon reaching fetal circulation, where does most of the de-oxygenated blood go?
RA –> RV –> patent Ductus arteriosus
Why does blood preferentially flow through the PDA rather than pulmonary vein?
fetal lungs are high pressure
What is a closed foramen ovale called?
fossa ovalis
What drug is used to keep the PDA open?
Indomethacin
What prostaglandins keep the PDA open?
E1 and E2
What does the umbilical vein become?
ligamentum teres hepatis
What does the umbilical artery become?
medial umbilical ligaments
What does the ductus arteriosus become?
ligamentum arteriosum
What does the ductus venosum become?
ligamentum venosum
What does the allantois become?
urachus/median umbilical ligament
What does the notochord become?
nucleus pulposus
Would coronary blood flow peak during early or late diastole?
early
Enlargement of the left atria can cause what two mediastinal symptoms?
dysphagia
hoarseness of voice
What is Ficks equation?
CO = O2 consumption/arterial O2 - venous O2
What is the equation for MAP?
(2/3 diastolic)(1/3 systolic)
Would hyperthyroidism increase or decrease pulse pressure?
increase
Would aortic regurgitation increase or decrease pulse pressure?
decrease
Would aortic stenosis increase or decrease pulse pressure?
decrease
Would obstructive sleep apnea increase or decrease pulse pressure?
increase
Would cardiogenic shock increase or decrease pulse pressure?
decrease
Would tamponade increase or decrease pulse pressure?
decrease
What would decreased extracellular sodium do to contractility?
increase contractility
What would acidosis do to contractility? By what mechanism?
decrease
protons inhibit ca2+ influx
What would hypoxia do to contractiltiy?
decrease
What would hypercapnia do to contractiltiy?
decrease
What is the equation for LaPlace’s Law on wall tension?
(pressure)(radius)/(two)(wall thickness)
What is the Y-axis on Starlings Curve?
cardiac output
What is the X-axis on Starlings Curve?
preload/EDV
What is the Y-axis of the cardiac/vascular function curve?
CO/venous return
What is the X-axis of the cardiac/vascular function curve?
Right atrial pressure/EDV
What does the intersecting point of the cardiac/vascular curve mean?
CO = Venous return
Would a positive inotrope produce a left-shift or right-shift of the Cardiac/Vascular function curve?
left shift
Would HFor Digoxin OD produce a left-shift or right-shift of the Cardiac/Vascular function curve?
right shift
What would fluid infusion do to venous return? Would this produce a left-shift or right-shift on the Cardiac/Vascular function curve?
increase venous return
left-shift
What would fluid loss do to venous return? Would this produce a left-shift or right-shift on the Cardiac/Vascular function curve?
decrease
left-shift
What would spinal anesthesia do to venous return? Would this produce a left-shift or right-shift on the Cardiac/Vascular function curve?
decrease
left-shift
Do changes in TPR change RA pressure on a Cardiac/Vascular function curve? What does this mean?
no
X-intercept doesnt change
Would vasopressors produce an upward or downward shift of the Cardiac/Vascular function curve?
downward
Would vasodilators produce an upward or downward shift of the Cardiac/Vascular function curve?
upward
What valve closes before isovolumic contraction?
mitral
What valve opens as the end of isovolumic contraction?
aortic
What is the Y-axis on the pressure/volume curve?
LV pressure
What is the X-axis on the pressure/volume curve?
LV volume
In the left heart, what action produces an S1?
mitral valve closing
In the left heart, what action produces an S2?
aortic valve closing
In the left heart, what action produces an S3? When does an S3 occur?
mitral valve opening
beginning of diastole
What makes an S1 heart sound?
mitral and tricuspid valve closing
What makes an S2 heart sound?
aortic and pulmonic valve closing
What is an S3 heart sound associated with?
increased filling pressures
In what two patient populations is an S3 heart sound normal?
pregnant women and children
What makes an S4 heart sound?
atrial kick
What is an S4 associated with?
ventricular hypertrophy
What is the a-wave of the JVP?
atrial contraction
What causes a c-wave?
RV pushing into tricuspid valve
What causes the x–wave?
atrial relaxation
In what disease state is the X-wave present?
tricuspid regurgitation
What causes a v-wave?
RA filling with blood
What causes a y-wave?
blood filling RV from RA
Delayed closure of what valve occurs during splitting of S2 sounds?
pulmonic
What causes a wide splitting of S2?
anything that delays RV emptying
What causes a paradoxical splitting? What is the order of valve closing?
anything that delays LV emptying
pulmonic closes before aortic in this situation
Inspiration would increase the intensity of sounds from what side of the heart?
right side
What does the hand grip manuever accomplish?
increases vascular resistance
Does the hand grip manuever increase or decrease the intensity of left-sided heart pathologies?
increase
Would the hand grip manuever make a MVP occur earlier or later?
later
What does standing do to venous return?
decrease it
What does the valsalva manuever do to venous return?
decrease it
What does standing/valsalva manuever do to most murmurs?
weaken their intensity
What murmur can standing/valsalva manuever increase the intensity of?
hypertrophic cardiomyopathy
What does rapid squatting do to preload?
increase
What does rapid squatting do to venous return?
increase
What murmur can rapid squatting increase the intensity of?
aortic stenosis
Would rapid squatting increase or decrease the intensity of an MVP?
increase
What are the three presentations of aortic stenosis upon exertion?
syncope
Angina
Dyspnea
Woud mitral/tricuspid regurgitation be a systolic or diastolic murmur?
systolic murmur
Where does an aortic stenosis murmur radiate?
carotids
Where is a VSD murmur the loudest?
at the tricuspid valve
Would an MVP occur during diastole or systole? Early or late?
systole
late
Name three conditions that may cause an MVP?
myxomatous degeneration
rheumatic fever
papillary muscle rupture
Would an aortic regurgitation murmur be heard in diastole or systole? Early or late?
diastole
early
What are two presentations of aortic regurgitation that could be seen on physical exam?
head bobbing
bounding pulses
What murmur produces an opening snap?
mitral stenosis
What is the most common cause of mitral stenosis?
chronic rheumatic fever
What is the most common cause of a PDA?
congenital rubella
Where is a PDA best heard?
left infraclavicular area
What voltage is the action potential for a cardiac myocyte?
-85 mV
What voltage is the action potential for a cardiac nodal cell?
-40 mV
Why dont nodal cells have a Phase 0 similar to myocytes? Results in?
high RMP permanently inactivates fast sodium channels
slower conduction times
How does sympathetic stimulation speed HR?
increases opening of funny channels
What is the Mnemonic to remember the drugs that can increase QT?
Some Risky Meds Can Prolong QT
What is the S of Some Risky Meds Can Prolong QT?
Sotalol
What is the R of Some Risky Meds Can Prolong QT?
Risperidone
What is the M of Some Risky Meds Can Prolong QT?
Macrolides
What is the C of Some Risky Meds Can Prolong QT?
Chloroquine
What is the P of Some Risky Meds Can Prolong QT?
Protease Inhibitors (-navir)
What is the Q of Some Risky Meds Can Prolong QT?
quinidine
What is the T of Some Risky Meds Can Prolong QT?
Thiazides
Which Arrhythmia can kill a person with Long QT Syndrome?
Torsades
What are the two syndromes that can produce congenital long QT syndrome?
Romano-Ward
Jervell and Lange-Nielsen
Which congential long QT syndrome only produces cardiac defects? What is the inheritance pattern of this disease?
Romano-ward
autosomal dominant
Which congential long QT syndrome produces deafness in addition to cardiac defects? What is the inheritance pattern of this disease?
Jervall and Lange-Nielsen
autosomal recessive
What is the bypass pathway of WPW called?
bundle of Kent
What type of heart pathology can lyme disease create?
3rd degree
What 2nd messenger is activated by ANP?
cGMP
Where is BNP released from? When?
ventricular myocytes
increased stretch
What can BNP be used to rule out?
acute heart failure
What is synthetic BNP? What is it used to treat?
Nesiritide
acute heart failure
What does the aortic baroreceptor project to?
nucleus tractus solitarius
What does the aortic baroreceptor respond to?
increased pressure only
What nerve does the aortic baroreceptor respond to?
vagus
What nerve does the carotid receptor use?
glossopharyngeal
What does the carotid baroreceptor respond to?
increases and decreases in blood pressure
What is the normal pressure in the right atria?
less than 5 mm Hg
What is the normal pressure in the right ventricle?
25/5
What is the normal pressure in the left atria?
less than 12 mm Hg
What is the normal pressure in the LV?
130/10
What is the normal pressure in the pulmonary artery?
25/10
What is the only organ where CO2 causes vasoconstriction?
lung
What two ions cause vasodilation in skeletal muscle?
potassium and hydrogen ions
What chamber does pulmonary capillary wedge pressure measure?
left atria
What is the Starling Equation?
(Pc-Pi) - (πc-πi)
What does Pc represent?
capillary hydrostatic pressure
What does Pi represent?
capillary oncotic pressure
What does πc represent?
capillary oncotic