Comprehensive Transthoracic Echocardiogram TTE Flashcards
Using ASE Guidelines and DeWitt Echocardiography
According to ASE Guidelines list 2 parameters for measuring the IVS and posterior wall in the parasternal long axis view.
-At End diastole or peak R wave,
-largest volume,
-interface of compacted myocardium excluding other inserting structures, -just below MV leaflet tips, same time
-level of LVED dimension, only compacted tissue measured.
How does one determine which pulmonic valve cusp is the right posterior cusp in the RVOT view?
The right posterior cusp of the PV is easily identified because it is the cusp adjacent to the aortic valve.
Define Perpendicular
a 90° angle or T
Identify which image a sonographer uses to estimate the right atrial pressure. Then explain what finding would indicate a right atrial pressure of 8mmHg.
Using the subcostal view the sonographer would assess the IVC. There are two parameters: IVC size and IVC collapsibility.
If one of these is abnormal and the other is normal, the RAP is estimated at 8mmHg.
Describe the method to measure the pulmonary artery from the parasternal short axis view.
Midway between the PV and the PA bifurcation using and inner edge to inner edge technique at end diastole.
When measuring the left ventricular posterior wall care must me made to not include which structure and why?
The MV apparatus including chordae tendinae and papillary muscle.
Describe the method for measuring leading-edge to leading-edge.
The measurement begins at the first depth where the structure is seen and continue until the last depth the structure is seen.
In the parasternal long axis view, the __________ is located within the myocardium, while the __________ is posterior to the left atrium and a separate structure.
coronary sinus, descending AO
The posterior mitral valve leaflet is shaded in which color?
yellow
Define Compacted Myocardium.
The border between the anechoic blood filled chamber and the myocardium once it is dense, excluding any trabeculations.
In the PSAX view at the base, what chamber is the most anterior visualized?
RV
At what point in the cardiac cycle should the aorta be measure?
End Diastole
In the right ventricular inflow view, the _________ lies between the coronary sinus and the inferior vena cava.
eustachian valve
The left coronary cusp is outlined in what color?
Purple
Which measurement is made using inner-edge to inner-edge technique in the PLAX window?
LVOT, Annulus
Describe laminar flow patters
smooth, organized with parabolic velocity profile (slower flow near walls, faster in the center)
Describe turbulent flow
irregular, chaotic with irregular velocities due to the disordered movement, random directions
What view is the RV basal diameter in (for measuring purposes)?
Apical RV focus
how do you measure the RV basal diameter in Apical RV focused view?
end diastole, near TV annulus, compacted myocardium to compacted myocardium from septal wall to lateral wall of the RV
What is the normal measurement for the RV basal diameter in women?
3.98cm (greater than that is dilated)
What view is the IVS (for measuring purposes)?
PLAX LV focus view
How do you measure the IVS in PLAX?
end diastole, leading edge to leading edge, at the interface where the RV cavity meets compacted IVS & where the IVS meets the LV cavity
What is the normal measurement for the IVS in women?
6-9mm
In what view is the LVID (left ventricular internal dimension) for measuring purposes?
PLAX
How do you measure the LVID (left ventricular internal dimension) in PLAX?
end diastole & end systole, leading edge to leading edge, compacted myocardium of the IVS to the compacted myocardium of the posterior wall, just below the MV leaflets
What is the normal measurement for the LVID in women? (end diastole)
LVIDd 38-52mm
What is the normal measurement for the LVID in women? (end systole)
LVIDs 22-35mm
In what view is the LVPW? (left ventricle posterior wall) for measuring purposes?
PLAX
How do you measure the LVPW in PLAX?
end diastole, leading edge to leading edge, compacted posterior wall of the LV cavity to the LVPW to the pericardial interface
What is the normal measurement of the LVPW in women?
27-38mm
In what view is the LVOT (for measuring purposes)?
PLAX zoomed/LVOT focused
How do you measure the LVOT in PLAX?
mid-systole, inner to inner, approx. 3-10mm from valve, compacted myocardium VS to anterior MV leaflet
What is the normal measurement for the LVOT in women?
18-22mm
In what view is the AO root (for measuring purposes)?
PLAX zoomed LVOT focused
How do you measure the AO root in PLAX?
mid-systole, inner to inner, right coronary & non coronary leaflet insertion points at maximal opening of the valve.
What is the normal measurement of the AO root in women?
23 +- 2mm
In what view is the ascending aorta (for measuring purposes)?
PLAX
ignore
In what view is the LA (for measuring purposes?)
PLAX
How do you measure the LA in PLAX?
end diastole, leading edge to leading edge, at the level of the SoVA of AO root to PW
What is the normal measurement of the LA in women?
27-38mm
In what view is the ascending AO (for measuring purposes)?
PLAX
How do you measure the ascending AO in PLAX?
end diastole, leading edge to leading edge, at the largest dimension above the AO sinus
What is the normal measurement of the ascending AO in women?
27 +- 4mm
What are the 3 equations for stroke volume (SV)?
1) SV = EDV-ESV
2) SV (cm ^3) = VTI (cm) x CSA (cm^2)
3) SV (mL) = Pi r ^2 (cm^2) x VTI (cm)
Define stroke volume (SV)
The volume of blood ejected by the LV during each contraction
What are some clinical applications in which you would use an equation for SV?
-valvular regurgitation
-post physiologic/pharmacologic interventions
-pulmonary to systemic blood flow for patients w/ intracardiac shunts
-cardiac function
-cardiac output
-LV function & volume
-valvular disease
Define the Velocity Pressure Relationship - Simplified Bernoulli Equation
Describes the relationship between the velocity of blood flow & the pressure gradient across a stenotic or regurgitant valve. An increase in velocity of a fluid results in a decrease in pressure.
What are some clinical applications for the velocity pressure relationship - simplified Bernoulli Equation?
-valvular stenosis
-valvular regurgitation
-artery pressures (pulmonary)
-septal defect
What is the Pressure Relationship - Simplified Bernoulli Equation?
ΔP = 4v²
ΔP = 1/2ρv² where ΔP is the pressure difference, ρ is the fluid density, and v is the velocity difference between two points in the flow
Define Preload
AKA end-diastolic pressure, the degree of stretch the ventricular myocytes stretch at the end of diastole.
What are some circumstances that influence Preload?
-venous return
-diastolic dysfunction
-mitral stenosis
-Anything that prevents blood from easily filling the ventricle.
Define Afterload
the resistance the heart must pump against in order to eject blood out of the ventricles
What are some circumstances that influence Afterload?
-valve hypertension
-valve stenosis
Using a PW Doppler to measure the flow area of the LVOT what view do I need to be in?
A4C or A5C
What normal flow pattern is this and in what view?
the flow pattern of a normal LVOT in A5C
What is the normal velocity range for the LVOT in A5C for a PW measurement?
0.7 - 1.1m/s
Using a PW Doppler to measure the flow area of the ascending AO forward flow through the AO valve, what view do I need to be in?
SSN through LV Apex
What normal flow pattern is this and in what view?
the ascending AO forward flow through the AOV, SSN-LV Apex view
What is the normal velocity range for the ascending AO forward flow through the AOV for a PW measurement?
(less than) < 2m/s
Using a PW Doppler to measure the flow area of the descending AO Thoracic, what view do I need to be in?
SSN, Subcostal
What normal flow pattern is this and in what view?
descending AO Thoracic, SSN/Subcostal
What is the normal velocity range for the descending AO Thoracic for a PW measurement?
100-140cm/sec
Using a PW Doppler to measure the flow area of the descending AO proximal abdominal, what view do I need to be in?
SSN/subcostal
What normal flow pattern is this and in what view?
descending AO proximal abdominal
SSN/subcostal
What is the normal velocity range for the descending AO proximal abdominal for a PW measurement?
60 - 100cm/sec
Using a PW Doppler to measure the flow area of the LV Inflow (mitral) what view do I need to be in?
A3C, A4C, APICAL LAX
What normal flow pattern is this and in what view?
LV inflow (mitral), A4C
What’s the E Wave characteristics for LV Inflow of the A4C view?
-early diastole
-passive filling of the LV
-usually 1cm/sec
What’s the A Wave characteristics for LV Inflow of the A4C view?
-flow from atrial contraction
-varies by many conditions
Using a PW Doppler to measure the flow area of the RVOT & what view do I need to be in?
PLAX, PSAX (AV level), SUB Short-Axis
What normal flow pattern is this and in what view?
RVOT, PSAX
What is the normal velocity range for the RVOT for a PW measurement?
0.5 - 1.3m/s
Using a PW Doppler to measure the flow area of the RVIT Tricuspid TV Inflow & TV regurgitation what view do I need to be in?
A3C
What normal flow pattern is this and in what view?
RVIT Tricuspid TV Inflow & TV regurgitation, A3C
What is the normal velocity range for the RVIT Tricuspid TV Inflow & TV regurgitation for a PW measurement?
0.3 - 0.7m/s
Using a PW Doppler to measure the flow area of the LA Inflow Pulmonary Valve, what view do I need to be in?
A4C
What normal flow pattern is this and in what view?
LA Inflow Pulmonary Valve, A4C
What is the normal velocity range for the LA Inflow Pulmonary Valve for a PW measurement?
0.5m/s
Using a PW Doppler to measure the flow area of the RA Inflow (Hepatic veins) what view do I need to be in?
SSN/Subcostal
What normal flow pattern is this and in what view?
RA Inflow (Hepatic veins), Subcostal
What is the key factor to obtain accurate color flow doppler and spectral doppler?
Making sure your angle is 0 degrees/ parallel to flow
What is the appropriate color Nyquist limit setting for Adult Echos?
60cm/sec
What is the appropriate sweep speed setting for measuring elements of time on the spectral doppler graph?
100mm/sec
What normal flow pattern is this and in what view?
RVOT, PSAX
List some RV characteristics
-thin
-most arteries chamber
-moderator band
-complex crescent shape
What is the wall thickness of the RV?
1-5mm
When do you measure RVOT?
end-diastole
When do you measure the IVS?
end-diastole
Which valve has an E & A wave?
Mitral
When does the E & A wave happen?
during systole
What vessel has an S,D, & A Wave?
Pulmonary valve
What is the P Wave?
the atrial kick
What 2 structures have similar flow?
Pulmonary valve & IVC
Why is the tricuspid the biggest?
because it works at lower pressure
Which valve is the biggest?
Tricuspid
What 3 things drain into the RA?
-coronary sinus
-IVC
-SVC
What 4 things drain into the LA?
-right 7 left pulmonary valves
-Superior & inferior pulmonary valves
What is an indication that the IVC is dilated?
RA pressure is too high
What does ET mean and when does it happen?
ejection time, during systole
When do you measure the AO diameter?
end-diastole
When in A2C what do you NOT want to see?
the RV
How do you get to A2C?
90 degrees from A4C then turn another 30 degrees
What does the arrow reveal?
Moderator band
What does the arrow reveal?
LV false tendon
In the PLAX LV what 12 things do we document?
-RV wall
-RVOT prox
-IVS
-LVIDd
-LVIDs
-PWT
-LA
-LVOT
-AOV annulus
-SoVa
-Sinotubular junction
-Prox. AAO
What 8 structures in the PLAX LV do we measure at End-diastole?
-RV wall
-RVOT prox
-IVS
-LVIDd
-PWT
-SoVa
-Sinotubular Junction
-Prox. AAO
What 2 structures in the PLAX LV do we measure at End-systole?
-LVIDs
-LA
What 2 structures in the PLAX LV do we measure mid-systole?
-LVOT
-AOV annulus
What is LVEF?
a measurement of how much blood is pumped out of the LV chamber per contraction or heartbeat
What is FS?
a % of the LV size reduction from diastole to systole as measure from the basal segments via M-mode or 2D linear measurements
What is the best method of measurement to acquire the LV volume and LVEF?
2D biplane method of disk summation
Describe the RV
-thin
-squeezes concentrically during systole
-smaller
-more trabeculated
-complex crescent (triangular) shape
What is the most anterior chamber?
The RV
What is the RVOT prox normal range?
20 - 30mm