Cardio - General Flashcards
mitral valve prolapse =
Associated w/
mid systolic click
Marfan’s Syndrome
Cardiac output formula
CO=CVxHR
Total peripheral resistance formula
(MAP - R. Arterial pressure ~0)/CO
Resistance formula
R= ∆P/Q
or ∆P=QR
Resistance in series
R total = sum of Rs
Resistance in parallel
1/R total = sum of 1/R
1st line CHF Rx
ACE inhibitor - prevent cardiac remodeling
-Also beta blockers and ARBs
Loop diuretics is symptom management and HF
CO=
flicks equation
oxygen consumption/( arterial O2 content - venous O2 content)
watch units!!
what divides the R and L embryological atrium? (2)
septum primum -> osteum/foramen secundum
Septum secundom -> foramen ovale
How is blood shunted from the R to L atrium in embryo
foramen ovale (in septum secundum ) and osteum secundum (in the septum primum)
3 possible causes of atrial septal defect?
Common genetic abnormality associated>
osteum secundum overlaps foramen secundum
Absence of septum secundum
neither septum secundum nor septum primum develop
Downs syndrome
6 different aorticopulmonary septal(spiral septal) defects
embryological determination
tetralogy of fallout
persisitant truncus aretiosus
transposition of the great vessels
Dextrocardia
VSD
fenestrae
Neural crest derived
Ascending aorta and pulmonary trunk derived from?
Truncus arteriosus
Smooth outflow parts of L and R ventricles derived from
Bulbus cordis
trabeculated L and R ventricle derived from
Primitive ventricle
Trabeculated L and R atrium derived from
Primitive atrium
Coronary sinus derived from
L horn of sinus venosus
Smooth part of R atrium derived from
R horn of sinus venosus
Superior vena cava derived from
R common cardinal vein and R anterior Cardinal vein
1st aortic arch ->
maxillary artery (branch of the external carotid)
2nd aortic arch ->
stapedial artery and hyloid artery
3rd aortic arch ->
Common carotid
AND proximal part of internal carotid
L 4th aortic arch ->
aortic arch
R 4th aortic arch ->
right subclavian artery
6th aortic arch ->
proximal part of pulmonary arteries and ductus arterioles
ductus venosus shunt
shunts blood from the umbilical vein into the IVC (bypassing hepatic circulation)
foramen ovale shunt
shunts blood from the R atrium to the L
Ductus arteriosus shunt
shunts blood from the the pulmonary arteries to the descending aorta
What is the most oxygenated vessel in the developing fetus?
umbilical veins
What closes the foramen ovale
increased L Atria pressure due to decreased pulmonary vasculature and increased flow through the pulmonary system
What closes the ductus arteriosus
What can be given to close?
breathing -> increased O2 -> decreased prostaglandin E2
Indomethacin
What to give to keep ductus arteriosus open?
PGE1 or 2
KEEEEPs open
most common congenital anomaly
presents as?
VSD
Exercise intollerance
Most common cause of early cyanosis
Tetralogy of Fallot
L to R shunts (3)
seen as?
VSD - holosystolic mumor
ASD ( loud S1 and Fixed spit S2)
PDA - machine murmor
late cyanosis (blue kids
R -> Shunts (5)
seen as?
Persistent Truncus Arteriosus Transposition of the great vessels Tricsupid atresia Tetralogy of Fallot Total anomalous pulmonary venous return
Tricuspid atresia is fatal unless
Persistant ASD and VSD to allow mixing of blood (outflow to the pulmonary circuit is impaired)
Persistent truncus arteriosus pathology
neural crest cells of aorticopulmonary septum fail to divide aorta and pumpnary trunk -> one heart
Total anomalous pulmonary venous return pathology
the pulmonary vein does not return oxygenated blood to the L Atrium but instead back to the R circuit -> closed loop
Eisenmenger syndrome steps (4)
1 - L to R shunt
2. Leads to pulmonary hypertension w/ overuse of pulmonary vasculature
3- leads to hypertrophy of vasculature and resistance
4. Resistance builds and L -> R shunt becomes a R to L shunt (Cyanotic)
4 defects in the tetralogy of fallout
leads to
- Pulmonary valve stenosis
- R ventricular hypertrophy
- VSD
- Over riding aorta over the VSD
Leads to periods of R to L Shunting and cyanosis (get spells)
Crouch down to increase Systemic press to have L to R shunt again
Boot shaped heart think?
Tetralogy of Fallot in infants
R ventricle hypertrophy in adults
Infantile coarctation of the heart concerns and location?
the stenosis is PROXIMAL to the ductous arteriosus leading to the PDA being the only way of blood getting to the lower limbs
Adult coarctation of the heart location
stenosis DISTAL to the ductous arteriosus leading to increased pressure above the stenosis and notching of the ribs
Ebstein animal caused by?
Presents as (3)
Lithium use in mothers
Descent of tricuspid valves into the R ventricle. often have patent foramen oval.
See wide S2 split and tricuspid regurgitation
Congenital heart defects w/ digeorge’s syndrome(2)
truncus arteriosus
Tetralogy of Fallot
Down syndrome congenital heart defects?
ASD, VSD or AV septal defect
Congenital Rubella heart defect?
PDA
Pulmonary arterial stenosis as well
Turner syndrome heart defect (2)
Coarctation of the aorta Bicuspid valve (aorta)
Marfans congenital heart concerns
Aortic regurgitation -> dissection
Infantile diabetic mother concerns (2)
Big baby and associated delivery complications
Transpositions of great vessels
MAP =? (2 formulas)
2/3 diastolic pressure + 1/3 systolic pressure
CO x TPR
~P= QR
SV =
CO/HR
EDV - ESV
Why does CO decrease in ventricular tachycardia?
The diastolic filling is incomplete - too fast of HR
Pulse Pressure=
systolic - diastolic BP
Stoke volume is affected by (3)
COntractility
Preload
afterload
Role of Verapamil and contractility?
nondihydropyridine Ca2 channel blocker that lowers Ca intracellularly and contractility
Diltiazem also
Preload is the same as?(3)
Atrial pressure
end diastolic pressure
central venous pressure
hydralazine
decreases afterload w/ arterial dialation
nitrates
decrease preload w/ venous dialation
Ejection fraction =
Normally?
Stroke volume / End Diastolic Volume
> 55%
Viscosity of blood may increase in (3)
leads to?
polycythemia
hyperproteinemic states - multiple myeloma
hereditary spherocytosis
leads to increased resistance
X intercept of cardia venous function curve =
mean systemic filling pressure
normal L Atrial pressure
<12mmHg
Pulmonary wedge pressure measures?
L Atrial pressure
~ diastolic pressure of LV
BNP is released when from where?
Causes what?(2)
released from myocytes when they are stretched (like in CHF)
Leads to
vasodilatation
increased excretion of Na and water
Right sided heart signs (3)
Hepatomegaly (nutmeg liver
peripheral edema
JVD
Left sided Heart failure (5)
Pulmonary edema - with hemosiderin laden macrophage -> crackles and rales
- paroxysmal nocturnal dyspnea
- Othopnea
- DOE -dypnea on exertion
- Cardiac dilation
Renin secretion stimulated by what 3 mechanisms
sympathetic nervous system ( Beta 1 receptors -> CHF and compensation)
macula densa - senses low Na in glomerular filtrate
JG Apparatus - senses low BP
Leads to AT II
- > (vasoconstriction
- > Aldosterone secretion
Chronic CHF Rx (7)
First 4 improve surival and minimize heart remodeling
- ACE inhibitors
- ARBs
- Aldosterone inhibitors - spironolactone, eplereonone,
- beta blockers (metoprolol, carvediol, brisprolol)
Digoxin
Diuretics (loops and thalazides)
Vasodilators (Nitrate and Hydralazine)
Rx for Acute decompensated CHF
NO LIP
Nitrates Oxygen Loop Diuretics Inonotropics (stop beta, give dobutamine or phosphodiesterase) Position - upright
Blurry yellow vision, confusion, bradycardia, N/V and EKG changes?
Think of of Digoxin toxicity
Digoxin decreases conduction through the AV node
3 factors predisposing to Digoxin toxicity?
Renal failure - decreased excretion
Hypokalemia -
Quinidine - displaces digoxin from binding sites
Rx for Digoxin toxicity (3)
normalize the [K]
Mg
anti-digoxin FAB
–Atropine or pacemaker if not available
Examples of increased capillary pressure
leads to ?
heart failure, CHF, Thrombosis, tumor clothing, cast, Na/H2O retention
Edema
decreased plasma proteins examples
leads to ?
nephrotic syndrome, liver failure, protein malnutrition, protein losing enteropathy
edema
Uncreased capillary permeability pathological causes (3)
permeability also known as
burns, sepsis and extotoxins
Kf
increased interstitial fluid colloid osmotic pressure due to ?
Leads to?
blocked lymphatics
nonpitting edema, leaked proteins have no where to go, water mixes leading to a jello like mass
net filtration pressure formula
Pnet = (Pc-Pi) - (Pi c - Pi i)
low cardiac output and increased systemic vascular resistance indicative of what?(2)
Shock
Hypovolumetric or cardiogenic
Rx for Cardiogenic shock
Dobutamine and other ionotropics
Sepsis is characterized by what presentation?(3)
Systemic vascular resistance?
CO?
Rx? (3)
Presents w/ fever and warm to the touch skin
May be lactic acidotic due to low O2 and anaerobic metabolization
DIC
high output shock w/ 1st vasodiation (leak capillaries) -> increased CO (Tachy)
Rx- Abx, NE (pressor) and fluids
Neurogenic shock
CO?
Systemic vascular resistance
Rx?
Decreased systemic vascular resistance and CO w/out sympathetic inveration
IV fluids, steroids maybe
Cold and clammy wet skin w/ bradycardia think of? (2)
Hypovolumetric Shock
Cardiogenic Shock
Causes of hypovolumetric shock? (2)
burns
blood loss - trauma
Causes of cardiogenic shock? (7)
MI PE CHF Arrythmia Cardiac tamponode tension pneumo Cardiac contusion
femoral triangle?
Which are in the sheath?
NAVEL
Nerve Artery* Vein* Empty Lymph
Locations of central Lines (3)
How long ?
Complications?
Femoral
- 5-7 days
- can’t really move
Subclavian
- 3-4 weeks
- risk of pnemo
- bad for COPD and lung tumors
Internal jugular
- 3-4 weeks
- may punch the carotid
Swan Ganz usual done through which central line
Right Internal jug
> left Sub clavian (easy loop)
>right sub clavian (hard angle to drop down)
increase of preload has what effect on SV?
Increased SV
NO change in pressures really seen
Increase in Afterload -> what change in SV and ESV
SV decreases while ESV increases
Heart is working harder to meet increased aortic pressure, can’t contract as much
increase in contractility has what change on SV and ESV
Increase in SV and decerease in ESV. more contraction and excretion of the blood
NO real change in pressures so aortic valve still opens fairly normal
Isometric contraction contraction takes place when?
QRS complex occurs and ventricles are contracting increasing pressure, rich before aortic valve opens
S3 is associated with what pathology(4)
Heard when?
Dialated cardiomyopathy CHF Mitral regurgitation L-> R shunt sloshing ing
Heard right after S2 and the heart starts to fill in diastole
S4 is associated w/ what pathology (4)
Heard when
hypertrophic cardiomyopathy
aortic stenosis
chronic hypertension w/ Left ventricular hypertophy
Post MI
A stiff heart
Heard Right before S1 due to initial filling of the heart against a stiff heart wall followed by AV valve closure
a wave
c wave
v wave
Seen in JVD
a- r atrial contraction
c- r. ventricular contraction and bowing in of tricuspid
v- atrial filling against tricuspid valve
Normal splitting is due to?
Hear what?
drop in aortic pressure -> increase venous return and preload in the R ventricle -> delay in pulmonary valve closure vs aortic valve
heard on inspiration
wide splitting due to?
Pathology associated
Due to delay in R ventricle contraction w/ increase fluids and pulmonic valve closes after aortic
Varies with inspiration
pulmonary stenosis or R bundle branch block
Fixed splitting due to ?
Pathology associated?
due to fixed increased blood volume in the R ventricle from a L -> R shunt that is persistent. Increased volume compared to L ventricle delays closure of pulmonic valve vs tricuspid valve
Does not vary w/ inspiration
Atrial septal defect
Paradoxical Splitting
Pathology associated?
Due to L ventricular overfilling and delay in closure of aortic valve compared to pulmonic valve - always pathological,
Aortic stenosis or L Bundle branch block
Benign heart sounds if no pathology(4)
Split S1
Split s2 on inspiration
S3 in a patient <40
Early quiet systolic murmur
Bounding pulses, head bobbing, diastolic murmur
Aortic regurgitation
Hear immediate decrescendo
Diastolic murmurs
Mitral stenosis
Tricuspid stenosis
Aortic regurgitation
Pulmonic Regurgitation
Systolic murmurs
Aortic stenosis
Pulmonic stenosis
tricuspid regurgitation
mitral regurgitation
Inspiration has what effect on heart sounds
louder tricuspid of R heart murmurs
Expiration has what effect on heart sounds
louder mitral of L heart murmurs
Hand grip has what effect of heart sounds
Increased SVR -> increased after load
makes mitral regurgitation louder
Valsava maneuver has what effect on heart sounds
increased intrathoracic pressure -> decreased preload and after load
Quieter murmurs EXCEPT - hypertrophic cardiomyopathy
L side of the sternum diastolic murmur with wide pulse pressure -
aortic regurgitation
Causes of aortic regurgitation (4)
aortic root dilation -> syphilis ->marfans Bicuspid aortic valves - usually stenosis rheumatic fever
Opening snap heard over the apex of the heart in diastole
Can lead to
mitral regurgitation
-enhanced w/ expiration
Left atrial dilation
Cause of mitral stenosis
rheumatic fever
Heart Sounds best heard in L lateral decubitus
mitral stenosis
mitral regurgitation
L Sided S3
L sided S4
Causes of mitral valve regurgitation (5)
rheumatic fever endocaritis ischemic heart disease - ruptured chord tendineae LV dilation mitral valve prolapse
Holosystolic blowing murmur heard loudest at the apex of the heart
made louder w?
Radiates to?
mitral regurgitation
expiration and hand grip/squatting
Axilla
Causes of tricuspid regurgitation (2)
infective endocarditis
rheumatic fever
holosystolic murmur made louder with inspiration radiating to the right sternal border?
Tricuspid regurgitation
Crescendo decrescndo systolic ejection murmur w/ Ejection Click
Radiates where?
other findings?
aortic stenosis
Carotids
pulsus parvus et tardes - weak pulses
Aortic stenosis can lead to what 3 presenting problems
Syncope
Angina
Dyspnea
Causes of aortic stenosis(5)
bicuspid valve (30-40yrs old) Age related calcification (>60) Rheumatic valve disease unicuspid valve syphylis
Holosystolic harsh murmur that is loudest at the tricuspid?
tricuspid regurgitation
or VSD
Clinical picture key
Late systolic crescendo murmur w/ midsystolic click?
mitral valve prolapse
Phases of ventricular action potential and associated Channels of importance
What phase does myocytes contract
Phase 4 - I K -> polarized
Phase 0 - I Na -> depolarization w/ AP
Phase 1 - slight repolarization w/ Na channels closing and K channels opening
Phase 2 - I Ca channels open -> plateau, K channels still open (*contraction)
Phase 3 - Ca channels close and K channels open -> repolarization
Back to phase 4
Phases of pacemaker action potential
NO PHASE 1 or 2
Phase 4 - I K channels-> polarized w/ I funny channels that slowly depolarize allowing Na to leak in
Phase 0- threshold leads to I Ca channels to create AP
Skip Phase 1 and 2
Phase 3 - K channels open and Ca channels close leading to repolarization
Channels responsible for depolarization in Phase 0 in myocytes vs nodal cells
Myocytes - Na channels
Nodal cells - Ca channels
I funny channels are found where increasing what permeability
Found in nodal cells acting during phase 4 to slowly depolarize the cell by increasing Na permeability
4 Classes of anti arrhythmics and MOA
No Bad boy Keeps Clean
Na channel - phase 0 Beta blocker - Phase IV of Nodes and rate of depolarization (Beta 1 receptive) K channel - phase III Calcium channel (Phase 0 of Nodes)
Class 1A anti arrhythmics
MOA
Side effect as a class?
double quarter pounder
Disopyramide
Procainamide
Quinidine
Na phase 0 blocker -> Increase effective refractory period
increase AP duration (time of contraction of heart)
Torsades de pointes w/ Prolonged QT
Class 1B anti arrhythmic
MOA
mayo lettuce and tomato
mexiletine
lidocatine
tocainide
Na phase 0 blocker -> increase in effective refractory period, most often used ESPECIALLY post MI arrhythmia tacky and digitalis induced
Decrease AP
Rx for wolf parkinson White?
procainamide
Amiodarone